砜嘧磺隆(TITUS)在玉米和土壤中残留分析方法的研究

Gas Chromatographic Determination of Residue of Rimsulfuron in Soil and Corn

报道了砜嘧磺隆（ DPX－ E9636）在土壤和玉米中的残留测定方法。样品以丙酮提取，二氯甲烷萃取，弗罗里硅土柱净化，气相色谱测定，最小检测量为 0.2× 10－ 11 g，土壤、玉米籽和玉米茎叶中的最低检测浓度为 0.002 mg· kg－ 1，添加标准样品的回收率和变异系数分别为 85.72％、 87.89％、 90.20％和 3.37％、 1.86％、 3.67％。

A gas chromatographic method without derivatization was developed for analysis of rimsulfuron residues in soil and corn, respectively. The samples were extracted with acetone by blending and the extracts were partitioned with dichloromethane. The extracts were cleaned up by a column of florisil. The final residue was detected with gas chromatography equipped with an electron capture detector. The minimum detection limit for rimsulfuron was 0.2× 10－ 11g and the lowest detection concentrations in soil, corn and stem, leaf were 0.002 mg· kg－ 1, respectively. The recoveries of the analytical method for soil, corn and stem, and leaf were 85.72％ , 87.29％ and 90.20％ , with variable coefficients of 3.37％ , 1.86％ , and 3.67％ , respectively.