Identification of Growth Years of Scutellariae Radix By Characteristic Spectrum of Inorganic Elements Combined with Chemometrics / 中国实验方剂学杂志

ObjectiveTo obtain content characteristics of inorganic elements in Scutellariae Radix （aged 1-4 years）， and to explore the feasibility of identifying the growth years of Scutellariae Radix based on characteristic spectrum of inorganic elements combined with chemometric models. MethodAfter microwave digestion， the contents of Mn， Zn， Ca， Fe， Mg， Na， K， Cr， Cu， Se， As， Cd， Hg， Pb and Ni in 21 batches of Scutellariae Radix were determined by inductively coupled plasma atomic emission spectrometry （ICP-OES） and inductively coupled plasma mass spectrometry （ICP-MS）. Meanwhile， characteristic spectrum of inorganic elements in samples was drawn. The identification model was constructed to discriminate the growth years of Scutellariae Radix based on the combination of principal component analysis （PCA）， Fisher discriminant function and support vector machine （SVM）. ResultThe contents of Mn （7.79-36.48 μg·g-1）， Zn （10.12-31.43 μg·g-1）， Cu （6.38-17.20 μg·g-1）， K （2.98-13.89 μg·g-1）， Mg （3.45-7.78 μg·g-1） and Ca （2.32-7.09 μg·g-1） in Scutellariae Radix were detected by ICP-OES and ICP-MS， and their contents increased with the prolongation of growth years. PCA results showed that Cu， Ni， Cd， Na， Mg， Fe， Ca， Zn， Mn and Hg were characteristic elements of Scutellariae Radix. Samples with different years could be divided into four categories in the spatial characteristic diagram of Fisher discriminant analysis. The correct rate of SVM model for identifying the growth years of samples was 95.2%. ConclusionThis established method is accurate and rapid for discriminating the growth years of Scutellariae Radix， which can provide reference for the identification of other Chinese medicinal materials. It is suggested that some elements should be considered as indexes in subsequent construction of the quality evaluation system of Scutellariae Radix.

Determination and Analysis of Heavy Metals of Paridis Rhizoma from Different Localities and Pieces / 中国实验方剂学杂志

Objective:To analyze and determine heavy metal content in Paridis Rhizoma from different genus and localities,in order to provide a reference for selecting cultivation areas and establishing the quality standard of Paridis Rhizoma of heavy metals content. Method:Microwave digestion method combined with inductively coupled plasma atomic emission spectrometry method (ICP-AES) method were applied to determine the contents of 6 heavy metals,i.e. As,Cu,Hg,Cd,Pb and Cr in 39 samples of Paridis Rhizoma of different genus and localities in Yunnan Province. Cluster analysis,statistical analysis and principal component analysis (PCA) were used to compare the differences of heavy metals contents in different localities and species. Result:The contents of six heavy metals in Paridis Rhizoma met the ISO international standard of Heavy Metal Limit of Traditional Chinese Medicine-traditional Chinese Medicinal Materials. Under the limited value standard of Green Trade Standards of Importing Medicinal Plants and Preparations,the over-standard rate of heavy metal As was 15.4%,the excess rate of Cd was 5.1%,and the excess rate of Pb was 2.6%. The contents of Cu and Hg conformed to relevant requirements. Cluster analysis,statistical analysis and principal component analysis showed that for the same variety,differences in producing places had significant effects on heavy metal content,while differences in species had little effects. Conclusion:The results of this study indicated that the heavy metal content of Paris planted in and around Dali basically conformed to relevant standards. The differences of heavy metal content in Paris were mainly regional differences,which provided a theoretical basis for standardizing the cultivation of medicinal materials and formulating the limit standards of heavy metals for Paridis Rhizoma.

Interference correction for determination of cadmium,chromium,manganese,nickel and lead in workplace air by ICP-AES / 中国职业医学

OBJECTIVE: To explore the interference correction reduction method for the determination of cadmium(Cd), chromium(Cr), manganese(Mn), nickel(Ni) and lead(Pb) concentration in workplace air by inductively coupled plasma-atomic emission spectrometry(ICP-AES). METHODS: The interference sources in the determination of metals in workplace air with ICP-AES was analyzed. The results before and after the background correction or the internal standard calibration were compared. Linear regression is performed on the interference element mass concentration by interference error to obtain a table of interference factors. The measurement results of actual samples were corrected using background subtraction, internal standard correction, and interference factor method. RESULTS: The relative deviation of results and theoretical values without background subtraction were 219.5% and 131.5% for Cd and Pb, respectively. The relative deviation between the measured values and theoretical values was less than 10.0% after background subtraction. When the total metal ion concentration was >800.00 mg/L, the relative deviation between measured result and the theoretical values was-21.0%--11.0% without internal standard correction, and the absolute value of them were less than 10.0% after internal standard correction. The interference correction method was used to correct the concentration of Cd, Cr, Mn, Ni, Pb in welding smoke. The mass concentrations of Cd before and after interference correction were 3.90-32.50 and 1.20-7.10 μg/L, respectively. The mass concentrations of nickel before and after interference correction were 111.00-1 220.00 and 99.00-1 120.00 μg/L, respectively. The mass concentration of Cr,Mn and Pb remained unchanged before and after the interference correction. CONCLUSION: The background correction, internal standard correction and interference factor table can eliminate the interference for determination of metals in workplace air by ICP-AES and ensure the accuracy of results.

Content Determination of Magnesium in Esomeprazole Magnesium by Inductive Coupled Plasma Atomic E-mission Spectrometry / 中国药师

Objective:To establish a method for the content determination of magnesium in esomeprazole magnesium. Methods:The content of magnesium in esomeprazole magnesium was determined by inductive coupled plasma atomic emission spectrometry. Re-sults:The linear range was 10.0-80.0 μg·ml-1(r=0.999 8). The average recovery was 99.55% with RSD of 1.35% (n=9). The detection limit was 0. 000 75 μg·ml-1 and the quantitative limit was 0. 002 5 μg·ml-1 . Conclusion:The method is accurate, sensitive and reproducible, which can be used for the content determination of magnesium in esomeprazole magnesium.

Determination of Cu, Ni and Zn in Aluminum Food Packaging Materials by Strong Acid Cation Exchange Fiber Solid Phase Extraton-ICP-AES / 中国药师

Objective:To establish the analysis method for the determination of Ni, Cu and Zn in aluminum food packaging mate-rials by inductively coupled plasma atomic emission spectrometry ( ICP-AES) . Methods: A small amount of EDTA was added to the test solution till the concentration at 0. 010 0 mol·L-1 and the pH value was adjusted to 5. 0. Strong acid cation exchange fibers were used for the assisted extraction of Al3+ with ultrasonic. Al3+ could not quickly form a complex anion with EDTA, so it was adsorbed by the strong acid cation exchange fibers. Cu2+, Ni2+ and Zn2+ could form complex anions with EDTA rapidly, so they could not be ad-sorbed by the strong acid cation exchange fibers and were left in the solution to be determined. Results:After the separation, the con-tents of Cu, Ni and Zn were not lost, and the content of residual aluminum was about 170 times of that of Cu, Ni and Zn, which had not interferece with the determination of Cu, Ni and Zn. The sample standard addition recovery was within the range of 98. 3%-104%with RSD of 0. 2%-2. 5%(n=5). The relative errors between the measured values and the certified values of standard substances were less than 5. 0%. Conclusion:The proposed method can be successfully applied in the separation and determination of Cu, Ni and Zn in aluminum cans, barbecue aluminum foil and standard substances.

Determination of Trace Nickel in Agomelatine by Inductive Coupled Plasma Atomic Emission Spectrometry / 中国药师

Objective:To establish a method for the determination of trace nickel in agomelatine. Methods:An inductive coupled plasma atomic emission spectrometry method was applied in the determination at 221. 648 nm. The sample solution was prepared by the ignited residue of agomelatine. The content of nickel was determined using the standard curve. Results:The linear range was 0. 025-1. 000 μg·ml-1(r=0. 999 8). The RSD of precision was 0. 63%. The detection limit was 0. 000 8μg·ml-1. The quantitative limit was 0. 003μg·ml-1 . The average recovery was 99. 4% with RSD of 2. 20%. The RSD of repeatability was 1. 33%. Conclusion:The method is simple, sensitive and accurate in the determination of trace nickel in agomelatine.

Recent Progress of Dielectric Barrier Discharge in Atomic Spectrometric Analysis / 分析化学

In recent years, dielectric barrier discharge has been well developed in analytical chemistry, especially in spectrometric analysis. This review emphasizes its applications in atomic spectrometry, including atomic emission spectrometry, atomic absorption spectrometry, and chemical vapor generation for sample introduction to atomic spectrometry.

Miniaturized Corona Discharge-Atomic Emission Spectrometer for Determination of Trace Mercury / 分析化学

A miniaturized atomic emission spectrometer composed of a corona discharge source and a handheld charge-coupled device detector was constructed for the sensitive determination of trace mercury, with photochemical vapor generation for sample introduction. By using formic acid, mercury vapor was generated under the irradiation of UV light, and then the vapor was introduced into the corona discharge area with the carrier gas flow of argon. The optical signals were captured and analyzed by the charge-coupled device detector at 253. 7 nm. Under the optimized conditions including 4% formic acid, discharge voltage of 90 V, and carrier gas flow rate of 200 mL/min, the stable detection signals were obtained ( RSD=2. 5%). The calibration curves were plotted with the concentration of mercury ranging from 0. 5 to 1000 ng/mL, with a correlation coefficient >0. 99 and the limit of detection of 0. 03 ng/mL. Two certified reference materials were analyzed, and a t-test demonstrated that the determined results by the proposed method had no significant difference with the certified values at the confidence level of 95%. Water samples collected from both Funan River in Chengdu and the Lotus Pond on campus of Sichuan University were analyzed as well, with the recoveries of standard addition between 93 . 8% and 103%. The miniaturized instrumentation demonstrated several advantages including easy construction, low power consumption, high sensitivity, and portability for field analysis.

Determination of Metal Ions in Environmental Samples by Matrix-Assisted Microwave Induced Plasma Surface Sampling Atomic Emission Spectrometry / 分析化学

A novel method for the determination of metallic elements in environmental samples was developed based on the matrix-assisted plasma surface sampling atomic emission spectrometry ( AES system) . A piece of filter paper was used as sample substrate. By direct interaction of the plasma tail plume with the filter paper surface, the filter paper absorbed energy from the plasma source and released combustion heating to the analytes originally present on its surface, thus to promote the atomization and excitation process. Surface sampling was performed in both cases of liquid and solid state analytes. Therefore, no flow injection system was required and sample pretreatment process was simplified. The proposed method provides several advantages, including fast analysis speed ( about 240 samples/h ) , little sample consumption (μL or μg level) , simplicity in instrument design, and also ease of system operation. These advantages made it attractive as a potential miniaturized AES system for in situ and high-throughput elemental analyses. Quantitative analysis of metal ions were achieved in this study for elements Ag, Au, Ba, Cd, Cr, Cu, Eu, La, Mn, Ni, Pb, Sr and Y. Under optimal conditions, the LOD values of the 13 elements ranged from 1. 0 to 88 μg/L. The repeatability, expressed as relative standard deviation ( RSD) from 10 replicates, ranged from 2. 3% to 6. 8%. To validate the proposed method, the system was employed to determine metal elements in standard reference materials of environmental samples. The content of each element was well in agreement with the certified values.

Determinação sérica de lítio: comparação das metodologias de espectrometria de emissão e de absorção atômica / Determination of serum lithium: comparison between atomic emission and absorption spectrometry methods

Introduction: The therapeutic monitoring of lithium, through concentration measurements, is important for individual dose adjustment, as a marker of treatment adherence and to prevent poisoning and side effects. Objectives: Validate and compare two methods - atomic emission and atomic absorption - for the determination of lithium in serum samples. Methodology: Parameters such as specificity, precision, accuracy, limit of detection (LOD) and linearity were considered. The atomic absorption spectrometer was used, operating in either emission or absorption mode. For the quantitative comparison of 30 serum samples from patients with mood disorder treated with lithium, the results were submitted to Student's t-test, F-test and Pearson's correlation. Results: The limit of quantification (LOQ) was established as 0.05 mEq/l of lithium, and calibration curves were constructed in the range of 0.05-2 mEq/l of lithium, using aqueous standards. Sample preparation time was reduced, what is important in medical laboratory. Conclusion: Both methods were considered satisfactory, precise and accurate and can be adopted for lithium quantification. In the comparison of quantitative results in lithium-treated patients through statistical tests, no significant differences were observed. Therefore the methods for lithium quantification by flame atomic absorption spectrometry (FAAS) and flame atomic emission spectrometry (FAES) may be considered similar...

Introdução: A monitorização terapêutica por meio da determinação sérica de lítio é importante para proporcionar o ajuste individual da dose, como marcador de adesão e para prevenir intoxicações. Objetivos: Validar e comparar duas metodologias, a de emissão e a de absorção atômicas, para determinação de lítio em amostras de soro. Metodologia: Foram determinados parâmetros de especificidade, precisão, exatidão, limite de detecção e linearidade a fim de validar as metodologias para determinação de lítio. Foi utilizado espectrômetro de absorção atômica, funcionando no modo de emissão ou de absorção. Para comparação das metodologias foram utilizados os testes estatísticos (teste t de Student, o teste F e a correlação de Pearson) nos resultados quantitativos de 30 amostras de soro sanguíneo de pacientes que faziam uso terapêutico de lítio para o controle do transtorno de humor bipolar (THB). Resultados: Foram estabelecidos um limite de quantificação de 0,05 mEq/l de lítio e curvas de calibração de 0,05 a 2 mEq/l de lítio, construídas utilizando padrões aquosos, com redução no tempo de preparo das amostras, principalmente para ser utilizado em laboratório de análises clínicas. Conclusão: Os dois métodos foram considerados satisfatórios, precisos e exatos e podem ser adotados para a quantificação do lítio. Na comparação dos dois métodos por testes estatísticos em amostras de pacientes tratados com o fármaco, não foram observadas diferenças significativas entre os resultados encontrados. Desta forma, os métodos para quantificação do lítio por espectrometria de absorção atômica em chama (FAAS) e espectrometria de emissão atômica em chama (FAES) podem ser considerados semelhantes...

Determination of Trace Metals in Lutetium-Yttrium Orthosilicate by Solution-Cathode Glow Discharge-Atomic Emission Spectrometry / 分析化学

TheLutetium-YttriumOrthosilicate(LYSO)isakindofscintillatingcrystalmaterialwiththebest comprehensive properties. In this work, the trace elements Ca, Fe, K, Li, Mg and Na in LYSO were determined by solution-cathode glow discharge-atomic emission spectrometry ( SCGS-AES ) . The optimal conditions included 0. 1 mol/L HNO3 sample solutions and operation at a voltage at 1080 V with a flow rate of 2. 0 mL/min. The LYSO matrix concentration tolerance of the SCGD source was determined to be 10 g/L. Sample solutions dissolving from several LYSO samples with HF, HNO3 and HClO4 were examined by SCGD-AES. For LYSO samples, the values obtained by SCGD-AES agree well with those obtained by axial inductively coupled plasma-atomic emission spectroscopy ( ICP-AES ) and inductively coupled plasma-mass spectroscopy (ICP-MS). The emissions of Lu and Y were not observed, so that the determination of trace elements in LYSO matrices could be conducted with little interference. The detection limits of Ca, Fe, K, Li, Mg and Na in LYSO were 1. 0, 3. 0, 0. 02, 0. 01, 0. 02 and 1. 0 mg/kg, respectively.

Determination of Ruthenium, Rhodium, Palladium, Iridium and Platinum in Copper-Nickel Sulfide Ores by Bismuth-Antimony Fire Assay / 分析化学

A bismuth-antimony fire assay method for the preconcentration of ruthenium, rhodium, palladium, iridium and platinum in copper-nickel sulfide ores was developed. 40. 0 g bismuth trioxide, 25. 0 g boric acid, 10. 0 g sodium carbonate and 1. 00 g starch were mixed with 10. 0 g sample in a 120 mL porcelain bowl, which was put in a furnace at 850 ℃. After 20 min the temperature was raised to 1000 ℃ and held for another 40 min, and then the bowl was taken out, with the slag poured, which left the bismuth button to air cooling. A two-step cupellation procedure was developed. During the first step, the bismuth button was cupellated in a magnesia cupel until its diameter reached 5 mm or so, then it was transferred to a crucible cover containing 20 g melting antimony and kept cupellating, at last a bead with a diameter of 1 mm was obtained. The bead was microwave-digested, after cooling down to room temperature, the solvent of which was transferred to a volumetric flask and diluted to 10 ml with water. Pt and Pd were analyzed by inductively coupled plasma-atomic emission spectrometry ( ICP-AES), while 99 Ru, 103 Rh, 191 Ir were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS), with 115 In, 185 Re as internal standard. RSD (n = 12) of the analysis results of five platinum group elements ( PGEs) in standard reference material GBW07196 ranged from 7. 04% to 9. 48% . Under the condition of 10 g sample, the detection limits (ng / g) for PGEs are 0. 027 for Ru, 0. 016 for Rh, 0. 11 for Pd, 0. 10 for Ir and 0. 11 for Pt. The method was applied to the determination of PGEs in GBW07194, GBW07195, GBW07196 with satisfactory results.

Determination of Fe, Co, Mn and Ni in Synthetic Diamonds by Inductively Coupled Plasma Atomic Emission Spectrometry / 分析化学

A method for the determination of Fe, Co, Mn and Ni in synthetic diamonds by inductively coupled plasma atomic emission spectrometry ( ICP-AES) was proposed. The synthetic diamond sample was decomposed completely, while the sample was burned in air at 1000 ℃ for 10 h, and then a mixed acid of H2 SO4 , aqua regia and HClO4 was used for the dissolving the residue of the sample. In this method, the limits of detection of Fe, Co, Mn and Ni were 0. 0147, 0. 0018, 0. 0006 and 0. 0027 mg/L, respectively. Under the optimum condition, Fe, Co, Mn and Ni in synthetic diamond sample were determined. The values of RSDs (n=7) were less than 0. 5%. The recoveries of added standard were 94. 0%-105. 0%.

Microelements in primary teeth by inductively coupled plasmad Atomic emission spectroscopy

AIM: This study was carried out to estimate the concentrations three microelements in enamel of deciduous normal and carious teeth using atomic emission spectrometry. METHODS: A total of 80 deciduous molar teeth indicated for extraction from children between the age group of 713 yrs. were taken for this study. The specimens were divided into four groups and the samples were prepared using centrifuge flotation technique. They were analyzed for Manganese, Strontium and Zinc using inductively coupled plasma atomic emission spectroscopy. RESULTS: This study shows that sound enamel contains more of strontium when compared to the carious enamel. Carious enamel contains more of manganese, and zinc when compared to the normal enamel. Elements zinc and strontium occur in high concentrations, where as elements manganese occur in low concentrations in enamel. The concentrations of elements manganese, strontium and zinc does not vary in relation to sex of individual. CONCLUSION: The microelements strontium and zinc are present in high concentration. Further studies are necessary to see their potential in mineralization and anticariogenic process.

Determination of wholesome elements and heavy metals in safflower （Carthamus tinctorius I.. ） from Xinjiang and Henan by ICP-MS/ICP-AES / 药物分析学报

An inductively coupled plasma mass spectrometry （ICP-MS） or inductively coupled plasma atomic emission spectrometry （ICP-AES） was developed to determine 19 elements in safflower, a traditional Chinese medicinal herb from Xinjiang Autonomous Region and Henan Province of China. Totally 19 elements in safflower included heavy metals, i.e. As, Cd, Cu, Hg and Pb, and wholesome elements, i.e. Al, Ca, Co, Cr, Fe, Mg, Mn, Mo, Ni, P, Se, Sr, V and Zn. The results showed that the concentrations of heavy metals in safflower samples were both low, all of which met the national hygiene standards except for Pb in Xinjiang sample. Meanwhile, the distribution tendency of elements in the two samples was similar, which indicated that the plant might absorb given elements in a proportional way. The method can be used for the quality control of elements in safflower, and it provides a way for the determination of the contents of safflower from Xinjiang and Henan.

Determination of wholesome elements and heavy metals in safflower (Carthamus tinctorius L.) from Xinjiang and Henan by ICP-MS/ICP-AES / 药物分析学报

An inductively coupled plasma mass spectrometry (ICP-MS) or inductively coupled plasma atomic emission spectrometry (ICP-AES) was developed to determine 19 elements in safflower,a traditional Chinese medicinal herb from Xinjiang Autonomous Region and Henan Province of China.Totally 19 elements in safflower included heavy metals,i.e.As,Cd,Cu,Hg and Pb,and wholesome elements,i.e.AI,Ca,Co,Cr,Fe,Mg,Mn,Mo,Ni,P,Se,Sr,V and Zn.The results showed that the concentrations of heavy metals in safflower samples were both low,all of which met the national hygiene standards except for Pb in Xinjiang sample.Meanwhile,the distribution tendency of elements in the two samples was similar,which indicated that the plant might absorb given elements in a proportional way.The method can be used for the quality control of elements in safflower,and it provides a way for the determination of the contents of safflower from Xinjiang and Henan.

Determination of Rhodium by Inductively Coupled Plasma Atomic Emission Spectrometry With Chemical Vapour Generation Sample Introduction Technique / 分析化学

An inductively coupled plasma atomic emission spectrometry(ICP-AES) combined with a boron hydride vapour generation device was used for the determination of rhodium in waste catalyst. When the flow rate of sample and sodium borohydride solution was 2 mL/min, waste rate was 6 mL/min, the optimum conditions were as follows: 0.4 L/min of carrier rate, 1.0 mol/L of acidity of nitric acid for vapor generation and concentration of sodium borohydride 1.2(m/V). The study showed that a two-fold increase in the efficiency of rhodium was achieved as compared to nebulization. The detection limit was 6.9 μg/L, which is slight better than that of with nebulization. The linear range for rhodium was 20-1500 μg/L with a correlation coefficient of 0.9986. The mean recovery of sample analysis was 95.5%. Excellent agreement was found between the present method and FAAS.

Speciation of antimony (III) and antimony (V) using hydride generation for meglumine antimoniate pharmaceutical formulationsquality control

The pentavalent antimonies, mainly the meglumine antimoniate, are recommends as first-choice medicines for leishmaniasis therapy. In this work we described the development of formulations of meglumine antimoniate injectable medication, as well as the analytical methodology used in the selective determination of Sb(III) and Sb(Total) by hydride generation - inductively coupled plasma atomic emission spectrometry (HG-ICP-AES) and ICP-AES, respectively. On that purpose the analytical methodology was developed focusing on the HG-ICP-AES technique. The formulations using propylene glycol/water as vehicles in a 20:80 proportion were more appropriate for subsequent use in industrial scale. These formulations also showed a lower variation on Sb(III) percentage, no need of buffer solution to stabilize the formulation and no influence of the autoclaving in the quality of the product. The results of the development of the analytical methodology point out the proposed method as an efficient alternative for the determination of Sb(III) in the presence of large quantities of Sb(V) in injectable solutions of meglumine antimoniate, in a selective, linear, accurate and precise manner. In addition, the method showed a low limit of quantification, less interference of the matrix, and more resilience than batch techniques proposed in the Brazilian Pharmacopeia.

Ingredients and cytotoxicity of MTA and 3 kinds of Portland cements / 대한치과보존학회지

The aim of this study was to compare the compositions and cytotoxicity of white ProRoot MTA (white mineral trioxide aggregate) and 3 kinds of Portland cements. The elements, simple oxides and phase compositions of white MTA (WMTA), gray Portland cement (GPC), white Portland cement (WPC) and fast setting cement (FSC) were measured by inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray fluorescence spectrometry (XRF) and X-ray diffractometry (XRD). Agar diffusion test was carried out to evaluate the cytotoxicity of WMTA and 3 kinds of Portland cements. The results showed that WMTA and WPC contained far less magnesium (Mg), iron (Fe), manganese (Mn), and zinc (Zn) than GPC and FSC. FSC contained far more aluminum oxide (Al2O3) than WMTA, GPC, and WPC. WMTA, GPC, WPC and FSC were composed of main phases, such as tricalcicium silicate (3CaO.SiO2), dicalcium silicate (2CaO.SiO2), tricalcium aluminate (3CaO.Al2O3), and tetracalcium aluminoferrite (4CaO.Al2O3.Fe2O3). The significance of the differences in cellular response between WMTA, GPC, WPC and FSC was statistically analyzed by Kruskal-Wallis Exact test with Bonferroni's correction. The result showed no statistically significant difference (p > 0.05). WMTA, GPC, WPC and FSC showed similar compositions. However there were notable differences in the content of minor elements, such as aluminum (Al), magnesium, iron, manganese, and zinc. These differences might influence the physical properties of cements.

Determination of Chromium(Ⅵ)in Dyeing Wastewater by Flow Injection On-line Separation and Preconcentration with Inductively Coupled Plasma-Atomic Emission Spectrometry / 环境与健康杂志

Objective To establish a new method for the determination of chromium (Ⅵ) in printing and dyeing wastewater. Methods A combined technique was employed for the determination of chromium (Ⅵ) by flow injection on-line separation and preconcentration on a micro column packed with alumina(acidic form) and inductively coupled plasma-atomic emission spectrometry (ICP-AES).The effect of acidity,concentration of eluent and coexistence ion on separation and enrichment was detected.Results The detection limit was 0.72 ?g/L.The LOQ was 2.38 ?g/L.RSDs were 1.45%～2.12%.The recovery rates were 96.0%-104.0%.The concentration enhancement of chromium (Ⅵ) was 10 times for 45 s sample loading.Analytic frequency was 33 samples one hour. Conclusion This method is sensitive,rapid and applicable to the determination of chromium (Ⅵ) in dyeing wastewater.