聚季铵盐为结合相的薄膜梯度扩散技术富集测量自来水中痕量Cr(VI)

Determination of Cr(VI) in tap water with poly quaternary ammonium salt as a binding phase in diffusive gradients in thin-films

建立了以0.05mol/L聚季铵盐（PQAS）溶液为结合相的薄膜梯度扩散（DGT）装置（PQAS DGT）富集测量自来水中痕量Cr（VI）的分析方法。DGT法测得配制水中Cr（VI）的回收率为93.5%-102.4%,相对标准偏差（RSD）为2.25%-4.33%;测得自来水中Cr（VI）的浓度为2.68-3.45g/L,加标回收率为94.7%-102.6%;DGT方法对水中Cr（VI）的检出限为0.065g/L（采样48h）,可应用于自来水中痕量Cr（VI）的定量检测与早期预警。

Cr （Vl） in tap water was measured by the diffusive gradients in thin-films （DGT） technique using0.05mol/L poly quaternary ammonium salt（PQAS） solution as binding phase（PQAS DGT）. The recoveries of Cr（Vl） in prepared solutions measured by PASP DGT were 93.5%-102.4% with relative standard deviation （RSD）2.25%N4.33%. The concentration of Cr（Vl） in tap water measured by PQAS DGT was 2.68-3.45g/L withrecoveries of 94.7%-102.6%. The method detect limit for PQAS DGT was 0.065g/L（deployment time 48h）.Therefore, PQAS DGT could be used to measure trace Cr（Vl） and gave an early alarm in tap water.