Rapid screening for organochlorine and organophosphorus pesticides in milk using C18 and graphitized carbon black solid phase extraction cleanup

Abstract

A rapid, multiresidue, solid phase extraction (SPE) technique for the isolation and gas chromatographic determination of organochlorine and moderately polar organophosphorus pesticide residues in milk is described. Milk is sonicated with an acetonitrile-acetone-methanol mixture and centrifuged. The supernatant is subjected to a cleanup using both C18 and graphitized carbon black SPE columns. The pesticide residues are determined by gas chromatography with electron capture and flame photometric detection. The method required minimal volumes of solvent and resulted in the production of minimal volumes of hazardous waste.

Development and validation of a multiresidue method for the simultaneous determination of organophosphorus insecticides and their toxic metabolites in sugarcane juice and refined sugar by gas chromatography with flame photometric detection

“…Since the matrices involved in the present study (cane juice and refined sugar) are free from interfering pigments, the recoveries were not improved, rather reduced by the PSA + GCB combination as compared to PSA alone. Schenck and Casanova developed a rapid screening method to determine OP residues in milk using C 18 and GCB SPE cleanup. By employing C 18 and GCB‐SPE columns, they could get acceptable range of recoveries of phorate (91.1%), quinalphos (118.6%), malathion (119.5%), and chlorpyrifos (92.1%).…”

Magnetic graphene-based cyanopropyltriethoxysilane as an adsorbent for simultaneous determination of polar and non-polar organophosphorus pesticides in cow’s milk

“…CNPr-SPE is more suitable for extraction of polar compounds and C18-SPE is suitable for non-polar compounds and has been used by many researchers for OPPs analysis, respectively. 44,45 The SPE cartridges were placed in a 12-port SPE vacuum manifold from Supelco (PA, USA). Three effective parameterssolvent type, volume of solvent and sample volumewere optimized one at a time.…”

Development of dispersive solid phase extraction utilizing folic acid as an efficient and green sorbent followed by dispersive liquid–liquid microextraction for the extraction of some plasticizers from aqueous samples

“…Among these methods, DSPE is an effective and widely used method. Since it is basically like SPE, different types of sorbents, such as primary and secondary amine [21], silica [22], graphitized black carbon [23,24], and C 18 [24,25] , were used as the sorbent in this method. In DSPE, the sorbent is directly mixed with sample solution, so using a cartridge is not obligatory, and the contact area between the analytes and sorbent increases.…”