摘要
本文报道了新试剂２－（６－硝基－２－苯并噻唑偶氮）－５－二甲氨基苯甲酸与镍的显色反应，结果表明，在ＳＤＳ存在下，于ｐＨ５．５～７．０的水溶液中试剂与镍形成稳定的绿蓝色配合物，其最大吸收波长位于６５０ｎｍ，表观摩尔吸光系数为１．１６×１０￣５，配合物中镍与试剂的组成比为１：１，镍的浓度在０～４μｇ／１０ｍＬ范围内服从比耳定律。在氟化铵和硫脲存在下，方法具有较高的选择性，用于铝合金和镁合金中微量镍的测定，结果满意。
new reagent 2-(6-nitro-2-benzothiazol ylazo)-5-dimethvlaminobenzoic acid(6-NO_2-BTAMB)is recommended for the determination of nickel.It is shown that nickel forms a stable green-blue complex with 6-NO_2-BTAMB at pH 5.5～7.0.The maximum absorbance of the complex is at 650nm in a solution of SDS.Its ap-parent molar absorptivity is 1.16×10￣5 L·mol￣(-1)·cm￣(-1).Beer’s law is obeyed within the concen-tration range of 0～4 μg/10mL nickel.The ratio of nickel to 6-NO_2-BTAMB in the complex is 1:1.The selectivity of the reaction is improved by the addition of NH_4F and tbiourea as mask-ing agents. The proposed method has been ap-plied to the determination of nickel in aluminium and magnesium alloys with satisfactory results.
出处
《分析试验室》
CSCD
北大核心
1995年第1期19-21,共3页
Chinese Journal of Analysis Laboratory
基金
陕西省自然科学基金
关键词
硝基
吸光光度法
镍
BTAMB
nitro-2-benzothiazolylazo)-5-dimethylaminobenzoic acid
spectrophotomet-ry
nickel determination
