摘要
报道邻苯二酚紫（PCV）-示波计时电位法间接测定天然水中的总酸溶铝。在0．5mol/LNH4Ac（pH6．4）缓冲溶液中，PCV在dE／dt－E示波极谱图上出现两个切口，Ep1＝－0．80V和Ep2=-1．20V。加入铝后，切口深度变浅，切口深度的变化△h同加入铝量有关。在最佳条件下，即0．5mol/LNH4Ac，pH6．4及1×10-3mol/LPCV，第二个切口△h2变浅的幅度在4×10－7～4×10-6mol/L铝浓度范围内有线性关系。检测限为2×10-7mol/L。在1×10－6mol/L时标准偏差为8．3％（n=10）。应用该法测定了天然水中总酸溶铝，并同ICP-AES所获结果进行了对照。结果基本一致。
Indirect determination of total acid-soluble aluminum in natural waters by oscillopolarography in the presence of pyrocatechol violet (PCV ) is presented. In 0.5 mol/L NH4Ac buffer solution (pH 6.4) containing 1×10-3 mol/L PCV, PCV yields two incisions on the dE/dt-E oscillogram at the potentials of - 0.80 and - 1 .20 V. The incision depth (Ep = - 1 .20 V) declines when adding Al in the solution. The decreases of incision depth shows a linear relationship with increasing Al concentrations (4×10-7 ~ 4×10-6 mol/L) . It is the basis of indirect quantitative analysis. The relative standard deviation is 8. 3% for 1×10-6 mol/L kl (n = 10) and the detection limit is 2×10-7 mol/L. The Proposed method has been applied to determine total acid-soluble Al in natural waters and compared with the results obtained by inductively coupled plasma-atomic emmission spectrometric method.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2000年第5期590-593,共4页
Chinese Journal of Analytical Chemistry
基金
中国科学院长春应用化学研究所电分析化学开放研究实验室基金
国家自然科学基金!49831005&29777013
南京大学分析测试基金
关键词
邻苯二邻酚紫
示波计时电位法
天然水
总酸溶铝
Aluminum, oscillochronopotentiometry, total acid-soluble aluminum,pyrocatechol violet
