摘要
研究了镉(Ⅱ)与邻菲啰啉(phen)和曙红Y(EY)的显色反应条件。试验表明,在pH5.0HAc-NaAc缓冲溶液中,镉(Ⅱ)与phen和EY反应生成稳定的离子缔合物[Cd(phen)3]EY,离子缔合物的最大吸收峰位于568nm。镉(Ⅱ)浓度在0.02～0.8μg/mL范围内符合比尔定律,表观摩尔吸光系数为1.07×105 L.mol-1.cm-1,检出限为11.7μg/L。大部分常见离子不干扰测定,样品中较高浓度的Ag+,Hg2+,Ni 2+等离子干扰严重,测定前用巯基棉分离去除。方法用于测定工业废水中镉,结果与原子吸收光谱法一致,相对标准偏差为1.3%～1.6%(n=5),回收率为98%～103%。
The color reaction conditions of cadmium with o-phenanthroline and eosin Y（EY） was investigated.The results showed that cadmium could react with o-phenanthroline and EY to form a stable ion complex [Cd（phen）3]EY which had maximum absorption peak at 568 nm in HAc-NaAc buffer solution at pH 5.0.Beer＇s law was obeyed in the concentration range of 0.02-0.8 μg/mL for cadmium.The apparent molar absorptivity was 1.07×105 L·mol-1·cm-1 and the detection limit was 11.69 μg/L.Most common irons did not interfere with the determination.The interference of high-content Ag＋,Hg2＋ and Ni2＋ was serious and they should be separated and removed with sulphydryl cotton before determination.The proposed method has been applied to the determination of cadmium in industrial wastewater samples,and the results were consistent with those obtained by atomic absorption spectrometry.The relative standard deviations（RSD,n=5） were 1.3%-1.6 %,and the recoveries were 98%-103%.
出处
《冶金分析》
CAS
CSCD
北大核心
2011年第9期78-80,共3页
Metallurgical Analysis
基金
国家自然科学基金项目(21001048)
淮海工学院化学工程学院2011年度大学生实验室创新项目
关键词
分光光度法
镉
邻菲啰啉
曙红Y
离子缔合物
spectrophotometry
cadmium
o-phenanthroline
eosin Y
ionic complex
