主题：【讨论】日本本土产小菘菜检测出噻唑磷超标。

Solid-phase extraction (SPE) coupled with gas chromatography/mass spectrometry (gc/MS) was used to determine the fosthiazate residue in water samples. The water samples were first filtered through cellulose filters (0.45 microm pore size). A 100 mL volume of filtered water, in which 1 mL of methanol has been added, was then passed through a pre-conditioned 3 cm C18 cartridge at a flow-rate of 1.5 mL/min. Elution was performed by 1 mL of methanol. The eluant was finally dried under reduced pressure for solvent evaporation. The volume was quantitatively adjusted to 0.5 mL with methanol. The analysis was carried out on gc/MS. The mass spectrometer was operated in selected ion monitoring (SIM) mode. According to mass spectrum of fosthiazate, three selected ions at m/z of 126, 195, 283, respectively, were monitored for identification and quantification. High sensitivity and selectivity were achieved by using this method. The limit of detection for fosthiazate in water samples was determined to be 56.4 ng/L. The linearity was demonstrated over a wide range of concentrations covering from 0.282 to 141 microg/L. The recoveries were more than 85.5% and the relative standard deviations for the overall procedure were less than 4.42%. The fosthiazate residue was detected in the water samples from a pool near cropland where fosthiazate was used. The results demonstrate the suitability of the SPE-gc/MS approach for the analysis of fosthiazate in water.

原文由 zyl3367898(zyl3367898) 发表:
楼主真得很厉害，日、英、中文都会，可我直接看的中文，还是中文好认。但这篇论文也太短了吧。

原文由 MMYG(jl070869) 发表:
小菘菜是白菜的一种吧，经常要用到农药。