Study on the Matrix Effect of Gas Chromatography in the Determination of Prohibited Organophosphorus Pesticides in Fruits
Organophosphorus pesticides are a commonly used pesticide with good insecticidal effect.In recent years,some banned organophosphorus pesticides have been illegally used in fruit cultivation.In order to better carry out quality supervision of grassroots agricultural products and facilitate effective monitoring of illegal use of prohibited organic phosphorus pesticides such as acephate,omethoate,monocrotophos,methyl parathion,fenitrothion,methyl isothion,and triazophos during fruit cultivation,representative fruit matrices with different sugar contents,such as mango,lychee,and peach,were selected.Gas chromatography-flame photometric detector(GC-FPD)was used to systematically compare the effects of solid-phase extraction columns such as Florisil,PSA,and GCB/PSA on eliminating matrix effects.The results showed that Florisil could better eliminate matrix effects,and the matrix effects in different fruits were less than 20％.Within the concentration range of 0.02-10 μg/mL,the correlation coefficients of seven banned organophosphorus pesticides were good(r＞0.999),the limit of detection range was 0.004-0.012 mg/kg,and the limit of quantification range was 0.015-0.040 mg/kg.At three additive concentrations(n=6)of 1,5 and 10 fold quantification limits,the average recovery range was 71.8％-99.4％,and the relative standard deviation range was 4.34％-7.91％.Compared to the determination methods in the national standard,this method has higher detection sensitivity and can meet the requirements of grassroots laboratories for the determination of prohibited organic phosphorus pesticides in fruits.
gas chromatographyfruitprohibition of organic phosphorusmatrix effect
万方数据
维普
