琉基葡聚糖凝胶分离富集-1-(4-安替比林)-3-(2,4,6-三溴苯基)-三氮烯光度法测定痕量镍(Ⅱ)

Spectrophotometric Determination of Trace Amounts of Nickel(Ⅱ) with 1-(4-Antipyrine)-3-(2,4,6-tribromophenyl)-Triazene as Chromogenic Reagent After Separation of Thioglucosan Gel Column

摘要: 合成并鉴定了一种新的三氮烯试剂1-(4-安替比林)-3-(2,4,6-三溴苯基)-三氮烯(ABPT),研究了该试剂与镍(Ⅱ)的显色反应条件。在pH 10.0的硼砂-氢氧化钠介质中,在Triton X-100存在下,ABPT与镍(Ⅱ)发生灵敏的显色反应。络合物的最大吸收波长为515 nm,表观摩尔吸光率为2.1×105L·mol-1·cm-1。镍(Ⅱ)质量浓度在20.0~400 μg·L-1之间呈线性,检出限(3s/k)为8 μg·L-1,方法用于生活垃圾、水样品中痕量镍(Ⅱ)的测定,结果与原子吸收光谱法的测定结果相符,测定值的相对标准偏差(n=6)均小于5%,回收率在102.5%~105.0%之间。

Abstract: A new triazene reagent, 1-(4-antipyrine)-3-(2,4,6-tribromophenyl)-triazene (ABPT) was synthesized and characterized by elementary analysis and IR-spectrascopy. In a borax buffer of pH 10.0 and in the presence of Triton X-100, a ternary complex was formed among Ni(Ⅱ), ABPT and Triton X-100, having its absorption maximum at 515 nm, and molar absorptivity of 2.1 ×105L·mol-1·cm-1. Linearity range of Ni(Ⅱ) was kept from 20.0 to 400 μg·L-1, with value of detection limit (3s/k) of 8 μg·L-1. Samples of domestic gabbage and water were analyzed by the proposed method, giving results in consistency with those found by AAS, and values of RSD′s (n=6) found were less than 5%. Values of recovery found were in the range of 102.5% to 105.0%.