Ni(Ⅱ)-PAR共沉淀-原子吸收光谱法测定水样及奶茶粉中的锌  

FAAS determination of zinc in water and milk tea powder samples after enrichment by coprecipitation with Ni(Ⅱ)-PAR

作　　者：林建梅[1] 姚俊学[1] 

机构地区：[1]内蒙古大学化学化工学院,呼和浩特010021

出　　处：《分析试验室》2013年第2期58-59,共2页Chinese Journal of Analysis Laboratory

基　　金：内蒙古自然科学基金资助

摘　　要：研究了用4-(2-吡啶偶氮)-间苯二酚(PAR)为沉淀剂,以Ni(Ⅱ)为载体离子的共沉淀体系快速共沉淀分离富集水样和奶茶粉中的锌,并用火焰原子吸收光谱(FAAS)测定。共沉淀过程受体系酸度、载体镍、沉淀剂PAR的用量及陈化时间的影响。结果显示,在pH 5.0的条件下,能够定量共沉淀试样中的锌。方法检出限为3.77μg/L,用于水样及奶茶粉的加标回收率为97.0%～99.1%,相对标准偏差为1.3%～4.1%。A method was proposed for the determination of trace zinc with flame atomic absorption spectrometry after preconeentration of zinc by rapid copreeipitation technique with PAR-Ni （ Ⅱ ） at pH 5.0. The analytical parameters including pH, amount of nickel（ Ⅱ ） , amount of reagent, the standing time of the precipitate, etc. , were examined. The detection limit （DL） was found to be 3.77 μg/L for Zn（Ⅱ）. In analysis of lake water and the milk tea powder samples. RSDs and the standard addition recoveries of this method were in the ranges of 1.3% -4. 1% and 97.0% -99. 1% , respectively. The effect of matrix can be overcome by the method and the results are satisfying. The method proposed here is rapid and has good reproducibility.

关 键 词：火焰原子吸收光谱法 4-(2-吡啶偶氮)-间苯二酚 共沉淀 镍 锌 

分 类 号：O657.3[理学—分析化学]