摘要
在pH 9.00的NH3·H2O-NH4Cl介质中,镍（对H2O2氧化茜素红S（ARS）的褪色反应存在明显的催化作用,由此建立了一个光度法测定镍（的新体系。通过试验酸度、试剂用量、表面活性剂、温度和时间的影响,确定了最佳测定条件。考察了大量常见离子对反应的影响,发现大部分常见离子对测定无干扰,Fe3＋、Cu2＋的干扰可通过加入NH3F溶液和KI溶液消除。体系的最大吸收峰位于520 nm,线性范围为0.02~2.8μg/mL,检出限为0.008μg/mL。反应的表观活化能为71.68 kJ/mol。方法用于合金标准样品中镍的测定,结果与认定值一致。
Based on the obvious catalytic effect of trace nikel on the fading reaction of alizarin red S（ARS） oxidized by H2O2 in the buffer of NH3·H2O-NH4Cl at pH 9.00,a new sensitive kinetic spectrophotometric method for the determination of trace nickel was developed.The influence of acidity,concentration of reactants,surfactants,reaction temperature and reaction time were discussed,and the optimal determination conditions were established.The effect of lots of coexisting ions on reaction system were also investigated,which showed that most common ions had no interference on determination and the interference of Fe3＋ and Cu2＋ could be removed by adding NH3F solution and KI solution,respectively.The maximum absorbance peak of system was 520 nm.The linear range was 0.02-2.8 μg/mL.The detection limit was 0.008 μg/mL.The apparent activation energy was 71.68 kJ/mol.The method has been applied to the determination of trace nickel in alloy CRMs,and the results were in agreement with certified values.
出处
《冶金分析》
CAS
CSCD
北大核心
2011年第7期58-60,共3页
Metallurgical Analysis
基金
内蒙古自治区自然科学基金(200408020213)项目资助
关键词
动力学光度法
茜素红S
过氧化氢
镍
kinetic spectrophotometry
alizarin red S
hydrogen peroxide
nickel
