This study introduces a QuEChERS-GC-MS method for detecting amide herbicide residues in rice, highlighting its precision, sensitivity, and rapid application.

Objective To establish a QuEChERS combined with gas chromatography-mass spectrometry method for the simultaneous determination of 10 amide herbicide pesticides (alachlor, acetochlor, pretilachlor, butachlor, metolachlor, fluoramide, dimethyl Analytical methods for the residues of tetrafluorochloride, fenclofenac, pyridoxazine and fenacetate) residues. Methods: Samples were extracted with acetonitrile, purified and concentrated by QuEChERS method, then analyzed by gas chromatography-mass spectrometry using selected ion monitoring mode, and the most sensitive ion pair was used for quantitation. The results showed a good linear relationship among the 10 herbicides and pesticides in the range of 0.05~0.5 mg/L, the linear correlation coefficient (r2) was not less than 0.99, and the method detection limits were all less than 9 ¦Ìg/kg. Under the three addition levels of 0.05, 0.2 and 0.5 mg/L, the average spike recovery rate was 82.9%~107.9%, and the relative standard deviation was 1.2%~5.7% (n=6). Conclusion This method has the advantages of fast and simple pretreatment, good precision and high sensitivity, and is suitable for rapid verification and quantitative testing of amide herbicide pesticide residues in rice.

In the realm of agricultural produce and food safety, the quantification and monitoring of pesticide residues is a pivotal area of concern. Recent advancements in analytical chemistry have paved the way for more efficient and accurate methods to detect and quantify such residues, offering significant benefits for both consumer health and environmental protection. Among these advancements, a novel approach that combines Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) extraction with Gas Chromatography-Mass Spectrometry (GC-MS) has emerged as a highly promising method for the simultaneous determination of multiple amide herbicide pesticide residues.

Objective:

The primary objective of this study was to establish a QuEChERS-GC-MS method for the simultaneous determination of ten amide herbicide pesticides. These include alachlor, acetochlor, pretilachlor, butachlor, metolachlor, fluoramide, dimethyl tetrafluorochloride, fenclofenac, pyridoxazine, and fenacetate. These substances are widely used in agriculture to control weeds and enhance crop yields but can pose potential risks to human health and the environment if not properly monitored and controlled.

Methods: The methodology involved the extraction of pesticide residues from samples using acetonitrile, followed by purification and concentration through the QuEChERS method. The analysis was then conducted using Gas Chromatography-Mass Spectrometry (GC-MS) in selected ion monitoring mode. This approach allowed for the identification and quantification of the pesticides, using the most sensitive ion pair for accurate measurement.

Results:

The study yielded promising results, demonstrating a good linear relationship among the ten herbicides and pesticides in the concentration range of 0.05 to 0.5 mg/L, with a linear correlation coefficient (r2) of no less than 0.99. The method detection limits for all substances were found to be less than 9 µg/kg. Moreover, at three addition levels (0.05, 0.2, and 0.5 mg/L), the average spike recovery rate ranged from 82.9% to 107.9%, with a relative standard deviation of 1.2% to 5.7% (n=6). These findings indicate a high level of precision and accuracy in the detection and quantification of amide herbicide pesticide residues.

Conclusion:

The development of the QuEChERS-GC-MS method for the determination of amide herbicide pesticide residues represents a significant advancement in the field of analytical chemistry and food safety. Its fast and simple pretreatment, combined with good precision and high sensitivity, makes it an excellent tool for the rapid verification and quantitative testing of pesticide residues in rice and potentially other agricultural products. This method not only enhances our ability to ensure the safety and quality of food but also contributes to the broader efforts in protecting public health and the environment from the adverse effects of pesticide residues.

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