亚硝基R盐离子对固相萃取光度法测定钴(Ⅱ)
Ion-Pair Solid Phase Extraction-Photometric Determination of Cobalt with Nitroso R-Salt
摘 要
研究了用亚硝基R盐离子对固相萃取光度法测定钴,在pH 6.0 的HOAc-NH4OAc缓冲介质中,溴化十六烷基三甲基铵(CTMAB)存在下,亚硝基R盐与钴反应生成3∶1稳定络合物,该络合物可用C18固相萃取小柱富集,富集倍数达100倍,小柱上富集的络合物用乙醇洗脱后用光度法测定,钴的质量浓度在0.05~5.0 mg·L-1内符合比耳定律.方法用于食品样和水样中钴的分析,结果与AAS法测得结果一致,RSD值(n=5)≤2.5%,回收率在97%~103%之间.
光度法
钴
亚硝基R盐
Ion-pair solid phase extraction
Photometry
Cobalt
Nitroso R salt
Abstract
In an acetate buffer of pH 6.0,and in the presence of CTMAB,a stable complex,having the mole ratio (Co∶R) of 1 to 3,was formed between cobalt ion and nitroso R salt,which was concentrated on C18 solid phase extraction column,achieving a concentration multiplication of 100 times.The colored complex on the column was eluted with 1.00 (±0.01) mL of ethanol,the absorbance of which was measured at 530 nm with a 1 cm cell using reagent blank as reference solution.Beer′s law was obeyed in the range of 0.05-5.0 mg·L-1.This method has been applied to the determination of cobalt in some foodstuff samples and water samples,giving results in consistency with the results found by AAS,and values of RSD′s (n=5) and recoveries of ≤2.5% and in the range of 97%-103%.
中图分类号 O657.31
所属栏目 工作简报
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收稿日期 2005/8/4
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备注胡秋芬(1973-),女,云南玉溪人,副教授,从事环境分析化学研究工作.
引用该论文: HU Qiu-fen,WU Xian-hua,YANG Guang-yu,HUANG Zhang-jie,YIN Jia-yuan. Ion-Pair Solid Phase Extraction-Photometric Determination of Cobalt with Nitroso R-Salt[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2007, 43(3): 215～217
胡秋芬,吴献花,杨光宇,黄章杰,尹家元. 亚硝基R盐离子对固相萃取光度法测定钴(Ⅱ)[J]. 理化检验－化学分册, 2007, 43(3): 215～217
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参考文献
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【4】GB/T 8538.29-1987饮用天然矿泉水中钴的测定方法[S]．
【5】Yang G Y,Hu Q F,Yang J H,et al.Solid phase extraction and spectrophotometric determination of silver with 2-(2-quinolylazo)-5-diethylaminophenol as chromogenic reagent[J].Anal Sci,2003,19(2):299-302．
【6】Li Z,Yang G Y,Wang B X,et al.Determination of transition metal ions in tobacco as their 2-(2-quinolinylazo)-5-dimethylaminophenol derivatives using reversed-phase liquid chromatography with UV–VIS detection[J].J Chromatog A,2002,971(1/2):243-248．
【7】胡秋芬,杨光宇,汤丹俞,等.2-(2-喹啉偶氮)-5-二乙氨基苯甲酸固相萃取光度法测定环境水样中的镍[J].分析化学,2002,30(6):699-701．
【2】马文瑾,郭满栋.痕量钴的分析方法研究进展[J].理化检验-化学分册,1999,35(6):284-288．
【3】黄伟坤编著.食品分析与检验[M].北京:轻工出版社,1989:231-232．
【4】GB/T 8538.29-1987饮用天然矿泉水中钴的测定方法[S]．
【5】Yang G Y,Hu Q F,Yang J H,et al.Solid phase extraction and spectrophotometric determination of silver with 2-(2-quinolylazo)-5-diethylaminophenol as chromogenic reagent[J].Anal Sci,2003,19(2):299-302．
【6】Li Z,Yang G Y,Wang B X,et al.Determination of transition metal ions in tobacco as their 2-(2-quinolinylazo)-5-dimethylaminophenol derivatives using reversed-phase liquid chromatography with UV–VIS detection[J].J Chromatog A,2002,971(1/2):243-248．
【7】胡秋芬,杨光宇,汤丹俞,等.2-(2-喹啉偶氮)-5-二乙氨基苯甲酸固相萃取光度法测定环境水样中的镍[J].分析化学,2002,30(6):699-701．
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