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目的 建立在线预富集高效液相色谱法(HPLC)测定地表水中十二烷基苯磺酸钠(SDBS)含量。方法 以C18保护柱作为富集柱,安装于进样器定量环部位,以注射泵注入样品溶液进行预富集,通过对样品富集、纯化、脱附等条件进行考查,确定最佳样品富集、纯化、脱附等条件:洗脱分离采用25 mmol/L 醋酸铵+氨水混合溶液甲醇(15:85,V/V)为流动相,等度洗脱,紫外检测波长为225nm。结果 最终测定结果显示,SDBS 测定浓度在0.005~10 µg/mL 范围内峰面积与浓度呈良好线性关系(r=0.9973),方法检出限(S/n=3)为0.5 µg/L,加标回收率为104%~105%,本次研究对环境水样进行了含量测定。结论 在线预富集 –HPLC 测定SDBS的新方法,将固相萃取富集在线完成,以此提高检测灵敏度以及分析效率。此方法操作简单,具有较高的精密度、灵敏度和重现性,可应用于环境水样的测定。
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SDBS 标准品色谱图 注:a一富集前标准品色谱图;b一富集后标准样品色谱图。
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