[Use of the ICP-AES method for multi-element analysis of tobacco leaves]. / Zastosowanie metody ICP-AES w wielopier wiastokowej analizie wzorca lisci tytoniu.

The method of the atomic emission spectrometry with an excitation in the inductively coupled plasma ICP-AES has been applied to the simultaneous analysis of the elements: Al, Cd, Cr, Cu, Fe, Li, Mg, Mn, Ni, P, Pb, S, Sr and V in the tobacco leaves samples CTA-OTL-1. The spectrometric analyses have been carried out on the emission spectrometer Spectroflame ICP M. About 300 mg of the sample and 1 cm3 of the concentrated HNO3 acid have been sealed in the quartz tube and mineralized by the pressure method. Since the ICP-AES technique is the most suitable to the direct analysis of the solutions, the main problem to solve was a mineralization of the sample. An application of the HNO3 acid alone did not give satisfactory results--unsolved residue remained. As a consequence the results for Mg, Ni, Pb were too low, whereas for the Al-nearly twice lower than the respective values given in the sample reference data. It has been observed that an addition of the conc. HF acid helps to dissolve the residue and, consequently, the optimalization of the mineralization process in the presence of the HNO3-HF mixture has been carried out. The results show that the appropriate amount of the HF acid to be added is 0.25 cm3. The other methods of mineralization using various mixtures of acids did not give good results. Only HNO3-HF mixture used in appropriate proportions give results in agreement with provided sample characteristics.(ABSTRACT TRUNCATED AT 250 WORDS)

[Simultaneous determination of metals in milk by the ICP-AES technique]. / Jednoczesne oznaczanie metali w mleku technika ICP-AES.

The method of the emission atomic spectrometry with an excitation in the inductively coupled plasma (ICP-AES) has wide range of applications due to the possibility of the simultaneous determination of several elements in various materials. This technique allows to carry out a multi-element analysis at relatively low consumption of the sample which is an additional advantage of the method. In this paper we report an application of the ICP-AES method for a direct determination of the element Al, Cu, Fe, Mn, Sn and Zn in the samples of milk. Several types of pressure mineralization (teflon bomb, sealed quartz tubes) as well as the pressureless technique with the use of the H2SO4, HNO3 and H2O2 agents have been studied. The determinations have been carried out with the use of the Spectroflame M sequential spectrometer with the excitation in ICP plasma made by Spectro Analytical Instruments at the Frequency of 27.12 MHz. The milk samples after mineralization have been diluted to the same volume and directly introduced into the ICP plasma with the help of the pneumatic nebulizer of Meinhard type. On the basis of the obtained results it has been concluded that with an application of the aforementioned mineralization method the average values for the determination of the particular elements are comparable. Generally the most "repeatable" results have been obtained for the sample mineralized in the quartz tubes.(ABSTRACT TRUNCATED AT 250 WORDS)