摘要
本文报道钙镁试剂 ( CLG) -示波计时电位法直接测定天然水和饮用水中的铝含量。在 0 .2 mol/L 乙酸 -乙酸铵 ( p H=6.3)缓冲溶液中 ,加入铝后 ,铝 - CL G配合物切口电位为 - 0 .75V,切口深度在 5× 1 0 - 6～ 5× 1 0 - 5mol/L范围内呈线性关系 ,检测下限为 4× 1 0 - 6 mol/L。在 5× 1 0 - 5mol/L时相对标准偏差为 4.7% ( n=1 0 )。应用该法测定了天然水和饮用水中铝含量 ,并同 ICP/AES法所获结果进行了对照 。
Determination of total aluminum in natural and drinking waters by a.c. oscillopolarography in the presence of calmagite (CLG) is presented in this paper. In 0.2 mol·L -1 NH 4Ac HAc buffer solution(pH 6.3), Al CLG complex yields one incision on the d E /d t E oscillogram at the potential of -0.75 V when Al is added in the solution. The incision depth is linearly proportional to the Al concentration in the range of 5×10 -6 ～5×10 -5 mol·L -1 . The detection limit is 4×10 -6 mol·L -1 and the relative standard deviation is 4.7% for 5×10 -5 mol·L -1 Al(n=10). The proposed method has been appplied to the determination of total Al in natural waters and drinking waters. The method is found to be in good agreement with the results obtained by the ICP AES method.
出处
《分析科学学报》
CAS
CSCD
北大核心
2001年第1期6-10,共5页
Journal of Analytical Science
基金
国家自然科学基金 !(No.4 983 1 0 0 5)
中国科学院长春应用化学研究所电分析开放实验室开放基金
教育部国家重点实验室高级访问学
