Determination Of Multi Organ Phosphorous Pesticides Residues By Matrix Solid-phase Dispersion In Sulfur-containing Vegetables

Matrix solid-phase dispersion (MSPD) is one kind of new pretreatment technology developing over the past few years,which has unique property in solid, half solid or viscidity liquid. Its application is broader in modern pesticide residue analysis. The analysis technology of organic phosphorous pesticides residues in sulfur-containing vegetables was studied. It resolved the problem of organic sulphur during the analysis process of organic phosphorus pesticide residues in sulfur-containing vegetables. The determination method of multi-organic phosphorus pesticide residues in allium chinese with MSPD/GC were established.1. Through the comparison to the solid phase extract and the matrix solid phase dispersion, the experimental result indicated that the method of the matrix solid phase dispersion can effectively clear up the organic sulphur in sulfur-containing vegetables, and obtain a high adds recovery.2. Two solid-phase sorbets (florisil and neutral aluminum oxide), five eluents (petroleum ether, hexane, methylene dichloride, aether, ethyl acetate) was selected in the experiments. Obtaining the bellowing conclusions through the experiment :( a) Six kinds of organic phosphorus pesticide residues (Phorate, sulfotepp, dimethoate, chlorpyrifos, malathion, parathion) has higher recovery in flosiril than neutral aluminum oxide. (b) The effect of recovery with six kinds of organic phosphorus pesticide residues was better in aether and ethyl acetate than in the others. The best dosage of eluent was 30ml. (c) The adds recovery of six organic phosphorus pesticide residues was 85.8%~ 101.1%, and the RSD was 3.3?8.5。3. The determination method of 16 organic phosphorus pesticide residues (Phorate, sulfotepp, diazinon, disulfotion, iprobenfos, fenchlorphos, chlorpyrifos, malathion, parathion, quinalphos, phenthoate, ethion, carbophenothion, triazophos, EPN, isofenphos methyl) in allium chinese with MSPD/GC was established. The optimized analysis condition: solid-phase sorbets of florisil 5.0g, ethyl acetate / hexane (V/V=2/1) 30ml, allium chinese sample 2.0g. The adds recovery of sixteen organic phosphorus pesticide residues was 73.8.%~112.8%, the RSD was3.6?9.3,MRL was 0.009?0.032mg/kg,and correlation coefficient was 0.9905~0.9994。4. With the matrix solid-phase dispersion method processing onion, the blue onion, the leek, etc,the matrix solid phase dispersion can removes the disturbance organic sulphur from sulfur-containing vegetables. The blue onion, the leek, and so on, include more chlorophyll, therefore this kind of vegetables sample processing need connect the activated charcoal and can achieve a better processing effect, the activated charcoal best amount was 2g.