快速分离富集火焰原子吸收测定不同盐度海水中溶解态锌的新方法  

Determination of dissolved trace Zn in seawater with different salinity by a hig speed separation and preconcentration method in a knotted reactor coupled with flame atomic absorption spectrometry

作　　者：王中瑗[1] 张宏康[2] 余汉生[1] 李小敏[1] 蔡剑文[1] 蔡斯斯[2] 

机构地区：[1]国家海洋局南海环境监测中心,广东广州510300 [2]仲恺农业工程学院轻工食品学院,广东广州510225

出　　处：《海洋环境科学》2016年第4期618-622,共5页Marine Environmental Science

基　　金：国家自然科学基金青年基金(41406093);国家海洋局环保司2011年度<珠江口海洋环境质量综合评价方法>(DOMEP(MEA)-03-01);广东省教育厅科技创新项目(2013KJCX0103);广东省科技计划项目(2016A020210138)

摘　　要：本文建立了一种快速分离富集火焰原子吸收测定不同盐度海水中溶解态Zn的新方法。此新方法将流动注射（FI）编结反应器（KR）空气混合吸附在线富集与火焰原子吸收光谱法（FAAS）联用。进样流速6.0 m L/min;进样时间60 s,测定20μg/L的锌,浓集系数（EF）由传统方法的9.4提高到23.9;测样频率为40/h;检出限为0.31μg/L;相对标准偏差（RSD,n=11）为2.1%。将该新方法应用于珠江口不同盐度的海水样品中溶解态的Zn的分析,所得回收率为95.4%～97.2%。该方法可以满足河口不同盐度海水中溶解态Zn的测定需求。A high speed separation and preconcentration method in a knotted reactor coupled with flame atomic absorption spectrometry was developed for the determination of dissolved trace Zn in seawater with different salinity. This new method was based on the air mixing sorption flow injection（ FI） on-line preconcentration procedure in a knotted reactor（ KR） coupled with flame atomic absorption spectrometry（ FAAS）. The preconcentration flow rate was 6. 0 m L /min,preconcentration time was 60 s. When the 20 μg / L Zn solution was detected,the enrichment factor（ EF） was promoted from 9. 4 to 23. 9 compared with the traditional method; The detection limit（ 3σ） was 0. 31 μg / L for Zn;The sample throughput was 40 / h,and the relative standard deviation（ RSD,n = 11） was 2. 1% for Zn. The method has been applied to the determination of dissolved trace Zn in seawater with different salinity with the recovery from95. 4% to 97. 2% and can satisfy the determination requirements of dissolved trace Zn in seawater with different salinity at estuary.

关 键 词：流动注射 火焰原子吸收 盐度 海水 锌 

分 类 号：P734[天文地球—海洋化学]