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

作　　者：胡秋芬[1] 吴献花[1] 杨光宇[2] 黄章杰[2] 尹家元[2] 

机构地区：[1]玉溪师范学院化学系,玉溪653100 [2]云南大学化学系,昆明650091

出　　处：《理化检验（化学分册）》2007年第3期215-217,220,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

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。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 ≤42. 5% and in the range of 97%-103%.

关 键 词：离子对固相萃取 光度法 钴 亚硝基R盐 

分 类 号：O657.31[理学—分析化学]