摘要
研究了镍与５－Ｂｒ－ＰＡＮ－Ｓ的显色条件。在ｐＨ６．０的缓冲液中，形成１：２型的稳定配合物，配合物的最大吸收峰位于５７０ｎｍ波长处，表观摩尔吸光系数ε＝４．６９×１０４Ｌ／（ｍｏｌ．ｃｍ）。镍量在０～３０μｇ／２５ｍＬ范围内符合比尔定律。采用巯基葡聚糖凝胶分离干扰离子富集镍，提高了方法的选择性。
The condition of colour reaction of nickel with 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulphonic acid (5-Br-PAN-S) has been studied. Nickel forms with 5-Br-PAN-S a 1:2 stable complex in pH6.0. The maximum absorbance of the complex is at 570 nm and its apparent colar absorptivity is 4.6910 4 L/molcm. Beer's law is obeyed in the range of 030 g/25mL for nickel. The common metal ions can be separated, and to enrich nickel by sulfhydryl dextran gel, thus, greatly improving the selectivity and sensitivity of the system.
出处
《农业环境保护》
CSCD
1999年第2期81-83,91,共4页
Agro-Environmental Protection
