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Determination of Organophosphorus Pesticide Residues in Tea by Solid-phase Extraction Gas Chromatography

Qing Zhang

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Abstract

A method for the determination of 16 organophosphorus pesticide residues in tea by Gas Chromatography-Nitrogen Phosphorus Detector(GC-NPD) with ultrasonic extraction was established.Tea samples were extracted with 10 mL of acetone,and then cleaned by homemade PSA/activated carbon SPE cartridge and eluted with acetonitrile-toluene(1∶3,V/V).16 organophosphorus pesticides were well separated and detected with high repeatability and precision.The recovery rate of the method was between 62.8% and 109.1%.The relative standard deviation was less than 14.7%.The limit of detection of 16 organophosphorus was between 0.01 mg/kg and 0.16 mg/kg.The method is reliable rapid and is,suitable for the analysis of pesticide residues in real samples.

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What this paper is about

A method for the determination of 16 organophosphorus pesticide residues in tea by Gas Chromatography-Nitrogen Phosphorus Detector(GC-NPD) with ultrasonic extraction was established.Tea samples were extracted with 10 mL of acetone,and then cleaned by homemade PSA/activated carbon SPE cartridge and eluted with acetonitrile-toluene(1∶3,V/V).16 organophosphorus pesticides were well separated and detected with high repeatability and precision.The recovery rate of the method was between 62.8% and 109.1%.The relative standard deviation was less than 14.7%.The limit of detection of 16 organophosphorus was between 0.01 mg/kg and 0.16 mg/kg.The method is reliable rapid and is,suitable for the analysis of pesticide residues in real samples.

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Available abstract

A method for the determination of 16 organophosphorus pesticide residues in tea by Gas Chromatography-Nitrogen Phosphorus Detector(GC-NPD) with ultrasonic extraction was established.Tea samples were extracted with 10 mL of acetone,and then cleaned by homemade PSA/activated carbon SPE cartridge and eluted with acetonitrile-toluene(1∶3,V/V).16 organophosphorus pesticides were well separated and detected with high repeatability and precision.The recovery rate of the method was between 62.8% and 109.1%.The relative standard deviation was less than 14.7%.The limit of detection of 16 organophosphorus was between 0.01 mg/kg and 0.16 mg/kg.The method is reliable rapid and is,suitable for the analysis of pesticide residues in real samples.

Key concepts: Chemistry, Chromatography, Detection limit, Gas chromatography, Pesticide residue, Repeatability, Solid phase extraction, Extraction (chemistry)

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