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用紫外线照射非荧光特性的砜嘧磺隆和氯磺隆,通过生成具有荧光特性的衍生物,分别研究了其在不同介质中的荧光特性及其影响因子,建立了测定土壤中砜嘧磺隆和氯磺隆残留的光化学荧光分析法(PCF)。结果表明:在2×10-3mol/L、一定酸碱度(砜嘧磺隆pH 7、氯磺隆pH 12)的十六烷基三甲基氯化铵(CTAC)胶体分散体系中,紫外照射150 s是PCF法测定砜嘧磺隆和氯磺隆残留的最佳条件,在此条件下砜嘧磺隆和氯磺隆的检出限(LOD)分别为0.7和0.6μg/kg,相对标准偏差(RSD)分别为1.7%和2.1%;在黄松田水稻土、黄红壤性水稻土和青紫泥田水稻土3种不同性质的土壤中,砜嘧磺隆和氯磺隆同时测定的平均回收率分别为99.0%±1.0%和98.7%±4.1%、97.6%±1.7%和97.0%±4.7%、96.7%±2.3%和95.4%±5.5%;所建立的PCF法可有效、快速测定土壤中同时残留的微量砜嘧磺隆和氯磺隆。
The non-fluorescent rimsulfuron and chlorsulfuron were irradiated by ultraviolet light, the fluorescence characteristics and their influencing factors in different media were studied respectively by generating the derivatives with fluorescence characteristics, And chlorsulfuron residual photochemical fluorescence analysis (PCF). The results showed that in the cetyltrimethylammonium chloride (CTAC) colloidal dispersion of 2 × 10-3mol / L, a certain pH (sulfosulfuron pH7, chlorsulfuron pH12), UV irradiation 150 s is the optimum condition for the determination of residues of rimsulfuron and chlorsulfuron by PCF. The detection limits (LOD) of rimsulfuron and chlorsulfuron are 0.7 and 0.6 μg / kg, respectively. The relative standard deviation (RSD) were 1.7% and 2.1%, respectively. The mean recoveries of both rimsulfuron and chlorsulfuron in three different soil types of yellow paddy soil, yellow-red paddy soil and purple soil paddy soil were Were 99.0% ± 1.0% and 98.7% ± 4.1%, 97.6% ± 1.7% and 97.0% ± 4.7%, 96.7% ± 2.3% and 95.4% ± 5.5%, respectively. The established PCF method was effective and rapid Residual trace amount of rimsulfuron and chlorsulfuron.