Evaluation of uncertainty in determination of five kinds of carbamate pesticide residues in apple by liquid chromatography-post-column derivatization

Abstract

Objective: This study aimed to analyze the accuracy of determination results of five kinds of carbamate pesticide residues in apple. Methods: Five kinds of carbamate pesticide residues in apples were detected according to NY/T 761—2008, and the uncertainty of the determination process was evaluated and analyzed. Results: The contents of carbosulfur, methomyl, 3-hydroxycarbamate, aldicarb and isoprocarb in apples are expressed in the form of expanded uncertainty as （0.105 7±0.007 8）, （0.107 7±0.006 2）, （0.109 2±0.005 8）, （0.103 9±0.008 4）, （0.106 1±0.007 6） mg/kg （k=2）. Conclusion: The main sources of uncertainty in the experiment are standard material, recovery rate, sample pretreatment, and detection equipment, and the overall expression is Urel（Standard）＞Urel（Recovery Rate）＞Urel （Pretreatment）＞Urel （Instrument）.

Keywords

• apple
• liquid chromatography
• carbamate pesticides
• uncertainty