ABSTRACT
Objective To establish a method for simultaneous determination of 6 kinds of organophosphorus pesticides in water.Methods The liquid-liquid extraction,gas chromatography with RTX-50 capillary column and flame photometric detector were used to determine 6 kinds of organophosphorus pesticides(DDVP,dimethoate,malathion,methyl parathion,parathion,chlorpyrifos)in water.Results Chromatographic resolutions for the above 6 kinds of organophosphorus pesticides were both over 1.5.The linear range was 2.0-16.0 ?g/ml(r=0.999 2～0.999 8),the detection limits were 0.009 2～0.076 ng,RSDs were 1.5%-7.1%,the average recovery rates were 93.0%-98.7%.6 kinds of organophosphorus pesticides could be absolutely separated on RTX-50 capillary column.Conclusion This method presents an advantage in detection limit,precision and accuracy compared with that in GB13192-1991,it will meet the requirement of Sanitary Standard for Drinking Water and routine water quality analysis.
ABSTRACT
The environmental pollution caused by organo tin attracted much concern,at the same time, the methodological study on determination of organo tin in environment made a desirable development, the chromatograph technique was used widely.A more detailed review on application of gas chromatograph and its coupled techniques in the environment organo tin compounds analysis was presented in this paper.
ABSTRACT
Objective The present paper compared the ion residues including cations residues and anions residues in autosampler plastic vials from 4 different ion chromatography companies and discussed the relationship between soaking duration time and ion releasing. Methods The separation and determination were carried out by IonPac CS12A cation exchange column, MSA isocratic eluent together with suppressed conductivity detector; and IonPac AS15 anion exchange column, NaOH isocratic eluent together with suppressed conductivity detector. 4 plastic vials from 4 companies were soaked in DI water with a particular volume followed by injecting the liquid samples to IC system in order to measure residue ions with low level(?g/L). Results The detection limits were 0.79-5.28 ?g/L.The linear range were 1-20 000 ?g/L for Cl-, NO2-, NO3-, SO42-, Na+, K+, Mg2+, Ca2+. The linear coefficients were 0.998 3-0.999 9. RSDs were below 3%.The recovery rates were 83.3%-112%. Conclusion This method satisfies the requirement of practical examination, and the suitable methods for repairing the plastic vials of autosampler is proposed.