聚天冬氨酸为结合相的薄膜梯度扩散技术富集测量自来水中痕量铬(Ⅲ)

Determination of Cr ( III) in tap water with sodium poly (aspartic acid) as a binding phase in diffusive gradients in thin-films

摘要: 建立了以0.05mol/L聚天冬氨酸(PASP)溶液为结合相的薄膜梯度扩散(DGT)装置(PASP DGT)富集测量自来水中痕量CrIII的分析方法。DGT法测得配制水中CrIII的回收率为94.4%~105.6%,相对标准偏差(RSD)为2.78%~5.03%;测得自来水中CrIII的浓度为2.99~3.47μg/L,加标回收率为93.2%~107.7%;DGT方法对水中CrIII的检出限为0.081μg/L(采样48h),可应用于自来水中痕量CrIII的定量检测与早期预警。

Abstract: Cr ( III) in tap water was measured by the diffusive gradients in thin-films ( DGT) technique using 0.05mol /L sodium poly ( aspartic acid) ( PASP) as binding phase ( PASP DGT) .The recoveries of Cr ( III) in prepared solutions measured by PASP DGT were 94.4% ~ 105.6% with relative standard deviation ( RSD) 2.78% ~ 5.03%.The concentration of Cr ( III) in tap water measured by PASP DGT was 2.99³.47μg /L with recoveries of 93.2% ¹07.7%.The method detect limit for PASP DGT was 0.081μg /L ( deployment time 48h) .Therefore, PASP DGT can be used to measure trace Cr ( III) and give an early alarm in tap water.