ICP-AES Determination of Cr(Ⅵ) in Certain Special Samples-Preliminary Separation of Cr(Ⅲ) by co-Precipitation
摘 要
电感耦合等离子体原子发射光谱法(ICP-AES)应用于某些特殊试样(特别试液背景色泽很深或略带混浊者)中铬(Ⅵ)的测定.试样溶液中共存的铬(Ⅲ)及一些其他金属离子的干扰,借在pH 9.5的氨性溶液中以Fe(Ⅲ)离子作载体共沉淀分离予以消除,用ICP-AES法测定滤液中铬(Ⅵ).试验表明:铬(Ⅲ)共存量达100 mg·L-1时,经沉淀分离后不影响铬(Ⅵ)的测定,铬(Ⅵ)的回收率接近100%.此方法的检出限(3σ)为0.054 mg·L-1,应用所提出的方法测定了一种黄色油漆中在铬(Ⅲ)共存下的铬(Ⅵ),平行7次测定,相对标准偏差为1.3%.
Abstract
ICP-AES was applied to the determination of Cr(Ⅵ) in certain special samples,especially those with deep color or slight turbidity.Interferences of Cr(Ⅲ) and some other co-existing metal ions were eliminated by precipitation with aq.ammonia at pH 9.5 using Fe(Ⅲ) ion as carrier,and Cr(Ⅵ) was determined in the filtrate by ICP-AES.It was proved that 100 mg·L-1 of Cr(Ⅲ) were tolerable and the recovery of Cr(Ⅵ) obtained,after precipitation were very near to 100%.Detection limit (3σ) of the method was found to be 0.054 mg·L-1.The proposed method was used for the determination of Cr(Ⅵ) in presence of Cr(Ⅲ) in a sample of yellow colored paint which was digested with conc.HNO3 preliminarity,the value of RSD′s (n=7) obtained were 1.3%.
中图分类号 O657.31
所属栏目 工作简报
基金项目 广东出入境检验检疫课题项目(GDJ42-2002)资助
收稿日期 2006/12/21
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备注刘崇华(1974-),男,江西吉安人,高级工程师,主要从事进出口工业产品化学检测及研究.
引用该论文: LIU Chong-hua,CHEN Yang,HUANG Li-na,LIU Wei-hong,YI Le-zhou,XIAN Yan-ping. ICP-AES Determination of Cr(Ⅵ) in Certain Special Samples-Preliminary Separation of Cr(Ⅲ) by co-Precipitation[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2008, 44(4): 350~351
刘崇华,陈阳,黄理纳,刘伟红,蚁乐洲,冼燕萍. 电感耦合等离子体原子发射光谱法测定某些特殊试样中痕量铬(Ⅵ)-共沉淀法快速分离铬(Ⅲ)[J]. 理化检验-化学分册, 2008, 44(4): 350~351
被引情况:
【1】李丹,俞晓峰,寿淼钧,叶华俊,韩双来, "在线离子交换富集-电感耦合等离子体原子发射光谱法测定明胶胶囊中铬(Ⅵ)含量",理化检验-化学分册 50, 805-808(2014)
【2】刘崇华,陈阳,龙朝阳,黄理纳, "电感耦合等离子体原子发射光谱法测定玩具包装物中六价铬和镉、汞、铅",理化检验-化学分册 44, 1066-1068(2008)
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参考文献
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【6】刘崇华,钟志光,李炳忠,等.ICP-AES法测定玩具涂料中重金属元素总量[J].光谱学与光谱分析,2002,22(5):840-842.
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【5】姚金玉,胡庆兰,谢文兵.氢氧化铁共沉淀-火焰原子吸收法测定鱼骨粉中Cr(Ⅲ)和Cr(Ⅵ) [J].光谱学与光谱分析,1994,14(5):69-73.
【6】刘崇华,钟志光,李炳忠,等.ICP-AES法测定玩具涂料中重金属元素总量[J].光谱学与光谱分析,2002,22(5):840-842.
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