Advanced GC/MS method for precise, sensitive detection of 107 pesticides, optimizing food safety and environmental monitoring with high accuracy and efficiency.

simultaneous detection method for multiple pesticides based on gas chromatography/ion trap mass spectrometry (GC/MS) and selected ion technology was established. Purification was performed using gel permeation chromatography (GPC) and Florisil cartridges. Pesticides were detected through GC/MS/SIM technology. After optimizing the chromatographic conditions and scanning ions, the impurities remaining in the pretreatment were further removed through detection methods, achieving the simultaneous detection of 107 pesticides in one injection. Perform analysis. The method is accurate and sensitive. For most pesticides, the recovery rate remains between 70% and 110%; the relative standard deviation is less than 20%; the detection limit remains between 0.01~0.2mg/kg (signal-to-noise ratio 3).

Introduction to Pesticide Detection Method

In the domain of analytical chemistry, particularly within the scope of environmental monitoring and food safety, the simultaneous detection of multiple pesticide residues in agricultural products presents a considerable challenge. A groundbreaking method employing gas chromatography/ion trap mass spectrometry (GC/MS) in tandem with selected ion technology has been established, marking a significant advancement in the accurate and sensitive detection of pesticides. This novel approach not only enhances the efficiency of pesticide detection but also improves the precision and reliability of analytical results, thereby contributing substantially to the safeguarding of public health and environmental integrity.

Purification and Detection Methodology

The methodological innovation is rooted in the utilization of gel permeation chromatography (GPC) and Florisil cartridges for purification, followed by the detection of pesticides through GC/MS/SIM (selected ion monitoring) technology. This multifaceted approach ensures a comprehensive cleanup and concentration of pesticide residues, effectively reducing the interference of matrix effects and impurities that are often encountered in the pretreatment stages of sample analysis.

A critical aspect of this method is the meticulous optimization of chromatographic conditions and scanning ions. Such optimization is pivotal for enhancing the selectivity and sensitivity of the detection process, allowing for the simultaneous identification and quantification of 107 different pesticides in a single injection. This level of efficiency and broad-spectrum detection capability underscores the method’s superiority over traditional analytical techniques, which typically require multiple injections and extensive sample preparation to achieve similar outcomes.

Enhancing Detection with Optimized Conditions

Accuracy and sensitivity are hallmarks of this innovative method. The recovery rates for most pesticides lie within the desirable range of 70% to 110%, indicating a high level of precision in quantifying pesticide residues. Furthermore, the relative standard deviation (RSD) is maintained at less than 20%, showcasing the method’s consistency and reliability. The detection limits for pesticides are established between 0.01 to 0.2 mg/kg, with a signal-to-noise ratio of 3, thereby demonstrating exceptional sensitivity and ensuring compliance with stringent regulatory standards for pesticide residue levels.

Precision and Sensitivity of Detection

The implications of this breakthrough are profound, particularly in the realms of environmental monitoring, agricultural practices, and food safety regulations. By facilitating the rapid and accurate detection of a wide array of pesticides in a single analytical run, this method significantly enhances the ability of regulatory bodies and quality assurance teams to monitor and control pesticide residues in agricultural products, ultimately protecting consumers from potential health risks.

Advancements in Food Safety and Environmental Monitoring

In conclusion, the establishment of a simultaneous detection method for multiple pesticides using gas chromatography/ion trap mass spectrometry and selected ion technology represents a monumental stride in analytical chemistry. It offers an accurate, sensitive, and efficient solution to the challenges posed by pesticide residue analysis, thereby playing an instrumental role in promoting food safety and environmental protection.

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Original research was done by Zhang Weiguo, Chu Xiaogang, Li Chongjiu

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