摘要
在硼酸缓冲溶液中,铜能对H2O2氧化日落黄的反应起到明显催化作用,反应产物在波长530 nm处有最大吸收峰,据此建立了流动注射-催化光度法直接测定河水中铜的方法.对流动注射系统参数进行优化,确定推动液C、显色液R1、显色液R2和试样S泵管流速分别为0.75 mL/min、0.30 mL/min、0.30 mL/min和0.55 mL/min,反应圈L长度为2m,进样环体积为350 μL.对所用试剂浓度进行优化,确定日落黄浓度为0.027 g/L,H2O2浓度为0.005 mol/L,缓冲溶液pH 9.8.铜的浓度在20～1 000 μg/L时与峰高呈良好的线性关系,相关系数为0.999.方法的检出限为1.5 μg/L;对河水中铜进行分析,测定结果与国标法一致,相对标准偏差在0.48％～1.2％之间.
Copper had obvious catalytic effect on the oxidization reaction of ＂Sunset Yellow＂ by H2O2 in boric acid buffer solution.The reaction product had maximum absorption peak at 530 nm.Based on this principle,the direction determination method of copper in river water by flow injection-catalytic spectrophotometry was established.The parameters of flow injection system were optimized.The selected experimental conditions were as follows：the flow rate of carrier solution （C）,the coloring solution （R1）,the coloring solution （R2） and sample solution （S） was 0.75 mL/min,0.30 mL/min,0.30 mL/min and 0.55 mL/min,respectively; the length of reaction loop （L） was 2 m; the volume of sampling ring was 350 μL.The concentration of used reagents was optimized.The selected concentration for ＂Sunset Yellow＂ and H2O2 was 0.027 g/L and 0.005 mol/L,respectively.The pH of buffer solution was 9.8.The concentration of copper in range of 20-1 000μg/L showed good linearity to the peak height with correlation coefficient of 0.999.The detection limit of method was 1.5 μg/L.The copper in river water was analyzed.The found results were consistent with those obtained by national standard method.The relative standard deviations （RSD） were between 0.48％ and 1.2％.
出处
《冶金分析》
CAS
CSCD
北大核心
2013年第10期60-63,共4页
Metallurgical Analysis
基金
国家(863计划)项目(2007AA092001-5)
关键词
铜
日落黄
流动注射
催化光度法
河水
copper
Sunset Yellow
flow injection
catalytic spectrophotometry
river water
