Determination of pesticide residues in soil by modified matrix solid-phase dispersion and gas chromatography.
Modified matrix solid-phase dispersion (MMSPD) and gas chromatography have been developed for quantitative analysis of various classes of pesticides (pirimicarb, metalaxyl, metolachlor, isopropalin and pendimethalin) in soil. MMSPD used Florisil as dispersant and acetone as solvent. Determination was carried out by gas chromatography with nitrogen-phosphorus detection (GC-NPD). The effect of the residence time of pesticides in soil on the recoveries was studied. MMSPD was compared with continuous liquid-solid extraction (LSE). MMSPD had good extraction efficiency and cleanup efficiency and the extract obtained could be directly subjected to GC analysis without further purification. The method gave recoveries ranging from 93% to 100% with relative standard deviations (RSDs) lower than 10%. The limits of detection (LODs) ranged from 0.2 to 2.0 ng g(-1).
Shen
Xia
X
Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
Su
Qingde
Q
Zhu
Xiaolan
X
Gao
Yun
Y
D000081:Acetamides / Q000032:analysis; D000096:Acetone / Q000737:chemistry; D000327:Adsorption; D000409:Alanine / Q000031:analogs & derivatives / Q000032:analysis; D000814:Aniline Compounds / Q000032:analysis; D002849:Chromatography, Gas / Q000379:methods*; D017633:Magnesium Silicates / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification; D012989:Soil Pollutants / Q000032:analysis* / Q000302:isolation & purification; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*
D000081:Acetamides; D000814:Aniline Compounds; D017633:Magnesium Silicates; D010573:Pesticide Residues; D012989:Soil Pollutants; C005013:Florisil; D000096:Acetone; C028175:metalaxyl; C008200:isopropalin; D000409:Alanine; C030856:pendimethalin; C051786:metolachlor