Matrix Effects of Pyrethroid Pesticides in Aquatic products using Gas Chromatography
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Abstract:
A rapid method was developed for the detection of 9 pyrethroid pesticides in aquatic products in this study. The matrix effects of Ctenopharyngodon idellus, Carassius auratus, Hypophthalmichthys molitrix, Oreochromis spp and Penaeus orientalis on 9 pyrethroid pesticides were studied, and the effects of matrix types, pesticids concentration and matrix concentration on the matrix effects were analyzed. The results showed that the 9 pyrethroid pesticides had a good linear relationship with the concentration in range of 5.0~750 ng/mL (tefluthrin of 2.5~750 ng/mL, pemethrin of 10~750 ng/mL) with the correlation coefficients of 0.9996~0.9999. The average recoveries of standard addition were 80.1±2.95%~116±2.45 % with the concentration of 5.0, 50 and 100 μg/kg, and the intra-day and inter-day precision were 0.272%~10.7 % and 0.164%~12.8 %, respectively. Different five kinds of aquatic products had different degree of matrix effects on 9 pyrethroids, and the matrix effects were in the range of 0.906~2.45. The matrix effects increased with the increase of matrix concentrations, and the Oreochromis spp, Hypophthalmichthys molitrix and Penaeus orientalis improved the matrix effects. In addition, the concentrations of target analysis had a significant influence on its matrix effect, and the matrix effect decreased with the increase of pesticide concentrations. Therefore, the matrix additive method should be used to reduce or eliminate the matrix effect to ensure the accuracy of quantitative result.
