电化学微流池富集-电热原子吸收法测定海水中(超)痕量镉  

Determination of Ultratrace Cadmium in Seawater by Electrothermal Atomic Absorption Spectrometry with Electrochemical Deposition in a Flow Microcell

作　　者：张爱平[1] 王红卫[1] 方禹之[2] 

机构地区：[1]南通出入境检验检疫局,江苏南通226005 [2]华东师范大学化学系,上海200062

出　　处：《分析科学学报》2010年第1期59-62,共4页Journal of Analytical Science

摘　　要：建立了电化学微流池与电热原子吸收光谱联用技术对（超）痕量镉进行测定的方法。利用自制电化学微流池对（超）痕量镉富集，后经反向电压和酸液洗脱，洗脱液由电热原子吸收光谱仪进行测定。优化了测定条件，实验结果表明，在0．05～0．80μg／L范围内成线性关系，相关系数为0．9912，检出限（3σ）达到0．004μg／L，富集倍率为11。将该方法应用到海水中（超）痕量镉的测定，相对标准偏差在2．2％～3．49／6（n=3），回收率在86．0%～95．5％。The combination of electrochemical flow microcell with electrothermal atomic absorption spectrometry has been described for the determination of ultratrace cadmium in this paper. The method relies on the electrodeposition carried out in a self-made flow microcell, followed by the dissolution of the deposit by reverse voltage and acidic solution and then the determination with electrothermal atomic absorption spectrometry. The effects of experimental parameters were investigated. Under the optimum conditions, a good linear relationship for Cd concentration ranging from 0.05 to 0.80 μg/L with a correlation coefficient（R） of 0.9912 and a detection limit（3σ） of 0. 004μg/L were obtained. The enrichment factor was 11 for the determination of cadmium with this method. It was applied to the determination of cadmium in seawater with the recovery of 86.0%95.5% （n= 3） and relative standard deviation of 2.2%-3.4%.

关 键 词：电化学富集 微流池 电热原子吸收光谱法 海水 

分 类 号：O657.31[理学—分析化学]