title: A quick analytical method using direct solid sample introduction and GC-ECD for pesticide residues analysis in crops.
abstract: In this work, an analytical method for GC using direct solid sample introduction was developed to tackle the problem regarding quick detection of pesticide residue in crops and large-scale screening of samples. 10mg of the crop solid sample without sample pre-treatment was directly introduced into a modified split/splitless injector for GC analysis. A split/splitless injector was modified to quickly remove oxygen and low boiling-point matrices of the sample. The whole sampling procedure was simple and it required less than 5 min. The experimental parameters including injector-port temperature, removal of oxygen and low boiling point matrices, size and the amount of the solid sample, oven temperature program were studied. Satisfactory recoveries of 6 pesticides (methyl parathion, fenitrothion, aldrin, dieldrin, endosulfan, o,p'-DDT) were obtained in maize and rice sample. Relative standard deviation was less than 15%. Experimental results showed that the proposed method was quick and reliable for pesticide residues analysis in crops.
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, PR China.
authors.forename: Cheok In
authors.initials: CI
authors.lastname: Ng
authors.forename: Xiangmin
authors.initials: X
authors.lastname: Zhang
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D018556:Crops, Agricultural / Q000737:chemistry*; D004583:Electrons; D007267:Injections; D010100:Oxygen / Q000302:isolation & purification; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry*; D015203:Reproducibility of Results; D013696:Temperature; D013997:Time Factors; D044366:Transition Temperature
chemical_list: D010573:Pesticide Residues; D010100:Oxygen