A liquid chromatography with tandem mass spectrometry method to simultaneously determinate chlorpyrifos, imidacloprid and imidacloprid metabolites in wheat

Abstract

A liquid chromatography with tandem mass spectrometry method was developed and validated to simultaneously determine chlorpyrifos, imidacloprid, and imidacloprid metabolites in soil, wheat grain, and wheat straw matrices. Satisfactory linearity (R2 ≥ 0.9965) of the method was obtained for all analytes. The ranges of limits of detection and limits of quantification for seven analytes in three matrices were 0.17–66.7 and 0.5–200 μg/kg, respectively. Average recoveries were 72.85–81.25% for chlorpyrifos, 78.54–84.70% for imidacloprid, 73.83–81.03% for imidacloprid olefin, 71.47–80.61% for 5‐hydroxy imidacloprid, 71.79–81.32% for imidacloprid urea, 70.42–82.20% for imidacloprid nitroguanidine, and 70.91–82.46% for imidacloprid 6‐chloronicotinic acid in soil, wheat grain, and wheat straw. The intra‐ and interday relative standard deviations were less than 8%. The established method was successfully applied for the residual analysis of chlorpyrifos, imidacloprid, and imidacloprid metabolites in actual soil, wheat grain, and wheat straw samples. The results indicated that the established method could be used to detect trace amounts of chlorpyrifos, imidacloprid, and imidacloprid metabolites in wheat and that the method might be able to provide some data on the detection of these seven compounds in other crops.

Determination, residue and risk assessment of trifloxystrobin, trifloxystrobin acid and tebuconazole in Chinese rice consumption

“…The selection of a chromatographic column is especially important for the detection of compounds. Improper selection will cause a certain deviation in the peak area, peak shape and retention time of the analyte (Huang et al, ). In this study, three different chromatographic columns, including the JADE‐PAK ODS‐AQ column (150 × 4.6 mm, 5 μm particle size, Techway Technologies, Guangzhou, China), the Phenomenex Luna C 18 column (150 × 4.6 mm, 5 μm particle size, Phenomenex Inc., Torrance, CA, USA) and the Agilent Zorbax Eclipse XDB‐C 18 column (150 × 4.6 mm, 5 μm particle size, Agilent Technologies, Santa Clara, CA, USA), were evaluated.…”

“…The optimized extraction solvent was acetonitrile containing 0.3% formic acid, and the optimized sorbent was C 18 for the three analytes. The other parameters could be set at any value within their investigated ranges (Huang et al, ).…”

“…Intra‐ and inter‐day recoveries and RSDs were used to express accuracy and precision, respectively. Five replicates were performed for each matrix on three different days at three different spiked levels (Huang et al, ). The spiked levels were as follows: 5, 50 and 500 μg/kg for TFS and TFSA in soil and brown rice; 12.5, 125 and 1250 μg/kg for TFS and TFSA in paddy plants; 25, 250 and 2500 μg/kg for TFS and TFSA in rice hulls and for TEB in soil and brown rice; 62.5, 625 and 6250 μg/kg for TEB in paddy plants; and 125, 1250 and 12,500 μg/kg for TEB in rice hulls.…”

Capillary liquid chromatography as an effective method for the determination of seven neonicotinoid residues in honey samples

“…LC is the most commonly applied technique for the determination of NNIs in different matrices such as waters, soils, vegetables, honey, fruit juices, and wines using UV [11][12][13][14][15] or MS detection [16][17][18][19][20][21][22]. Also, some CE methods have been published for their control in greenhouse air, waters, soils, cucumber, or beeswax using mainly MEKC-UV [23][24][25][26][27] or CZE-MS [28].…”

A sensitive electrochemical sensor modified with multi‐walled carbon nanotubes doped molecularly imprinted silica nanospheres for detecting chlorpyrifos

“…Thus, it is of extreme significance of detecting CPF in environmental samples and agricultural products. Then, many analytical methods have already been developed for the determination of CPF including HPLC , GC‐MS , photoelectrochemical sensing , colorimetry , and SPME .…”