摘要
用紫外线照射不具荧光特性的甲嘧磺隆,通过生成具有荧光特性的衍生物,研究了甲嘧磺隆在不同介质——水、二甲基亚砜、甲醇,以及在十二烷基苯磺酸钠、十六烷基三甲基氯化铵(CTAC)胶体分散体系中的荧光特性,并对包括溶剂体系、pH值和照射时间在内的影响分析方法灵敏度的物理化学参数进行了优化,建立了在CTAC胶体分散体系中测定水样中甲嘧磺隆的光化学荧光分析(PCF)法。结果表明:在浓度为2×10-3 mol/L、pH值为9的CTAC胶体分散体系中,用紫外线照射150 s是PCF法测定甲嘧磺隆的最佳条件,此条件下的检测限(LOD)为7μg/L,相对标准偏差(RSD)为1.3%;对自然水体样品中甲嘧磺隆的平均回收率为96.9%±2.2%。所建立的PCF法可有效测定水中残留的低剂量甲嘧磺隆。
Fluorescent ramification was formed when sulfometuron-methyl was irradiated by ultraviolet radiation.The photochemical fluorescence（PCF） characteristic of fluorescent ramification in various solvents（water,dimethyl sulfoxide,methanol）and colloid solution [sodium dodecyl sulfate,cetyltrimethylammonium chloride（CTAC）] were tested.Physicochemical variable influencing the sensitivity of the method have been optimized.The relevant factors such as the effects of the solvents system,acidity and the time for illumination were optimized and thus a novel PCF analytical method was developed for the determination of sulfometuron-methyl in water samples by adding cetyltrimethylammonium chloride colloidal dispersion.It＇s found that CTAC colloidal dispersion（2×10-3 mol/L） with pH 9 and illuminating 150 s were the best conditions to determine sulfometuron-methyl by PCF method.Under the optimum experiment conditions,the limit of determination was 7 μg/L,the relative standard deviation was 1.3%.The method was successfully applied to the analyze remains of sulfometuron-methyl in nature water,and the average recovery was 96.9% ±2.2%.It indicated that PCF analytical method established would be reliable in determination of sulfometuron-methyl residue in water.
出处
《农药学学报》
CAS
CSCD
北大核心
2011年第3期281-286,共6页
Chinese Journal of Pesticide Science
基金
浙江省测试基金项目(03123)
浙江大学第八期大学生科研训练计划(SRTP)资助
关键词
甲嘧磺隆
光化学荧光分析
残留
水
sulfometuron-methyl
photochemical fluorescence（PCF）
residue
water
