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[目的]建立测定水稻、田水和土壤中西草净上的残留量气相色谱质谱联用分析方法。[方法]通过田间试验和气相色谱质谱联用分析技术研究25%西草净可湿性粉剂在水稻、田水和土壤中的消解动态及其最终残留量。[结果]吉林长春市、黑龙江海伦市和湖南长沙市2年3地的田间试验结果表明:2011年,西草净在水稻植株、田水和土壤中的原始沉积量分别为5.048 mg/kg、22.299 mg/L和7.730 mg/kg,半衰期(t1/2)分别为2.5、1.4、3.9 d;2012年,西草净在水稻植株、田水和土壤中的原始沉积量分别为5.854 mg/kg、5.854 mg/L和0.090 mg/kg,半衰期(t1/2)分别为1.6、1.7、2.9 d。最终残留试验表明西草净在糙米、稻壳、稻株和土壤中的最终残留量均小于0.02 mg/kg。[结论]25%西草净可湿性粉剂可以在水稻上使用,但施药剂量最高为3 750 g/hm2,施药1次。
[Objective] The research aimed to establish a gas chromatography-mass spectrometric method for the determination of net residue in rice, field water and soil. [Method] The digestion dynamics and the final residues of 25% sodium net WP in rice, field water and soil were studied by field experiment and GC-MS analysis. [Result] The results of field experiments in Changchun, Jilin, Helen in Heilongjiang and Changsha in Hunan in two years and three years showed that the original deposition of simethicone in rice plant, field water and soil was 5.048 mg / kg in 2011, 22.299 mg / L and 7.730 mg / kg, respectively, and their half-lives (t1 / 2) were 2.5, 1.4 and 3.9 d, respectively. In 2012, the original sediment contents of simethrine in rice plant, field water and soil were 5.854 mg / kg , 5.854 mg / L and 0.090 mg / kg respectively, and the half-lives (t1 / 2) were 1.6, 1.7 and 2.9 d, respectively. Final residue tests showed that the final residues of simethicone in brown rice, rice hulls, rice plants and soil were all less than 0.02 mg / kg. [Conclusion] The 25% sisal net WP could be used on rice, but the highest dosage was 3 750 g / hm2 and the application was once.