Kagaya Shigehiro, Araki Yasuko, Hirai Noriyasu, Hasegawa Kiyoshi
Department of Applied Chemistry, Faculty of Engineering, Toyama University, Gofuku 3190, Toyama 930-8555, Japan.
Talanta. 2005 Jul 15;67(1):90-7. doi: 10.1016/j.talanta.2005.02.013. Epub 2005 Mar 23.
The coprecipitation behavior of 44 elements (47 ions because of chromium(III,VI), arsenic(III,V), and antimony(III,V)) with yttrium phosphate was investigated at various pHs. Yttrium phosphate could quantitatively coprecipitate iron(III), lead, bismuth, and indium over a wide pH range; however, 18 ions, including alkali metals and oxo anions, such as vanadium(V), chromium(VI), molybdenum(VI), tungsten(VI), germanium(IV), arsenic(III,V), selenium(IV), and tellurium(VI), were scarcely collected. In addition, 19 ions, including cobalt, nickel, and copper(II), were hardly coprecipitated at pHs below about 3. Based on these results, the separation of iron(III), lead, and bismuth from cobalt, nickel, and copper(II) matrices was investigated. Iron(III), lead, and bismuth ranging from 0.5 to 25mug could be separated effectively from a solution containing 0.5g of cobalt, nickel, or copper at pH 3.0. The separated iron(III), lead, and bismuth could be determined by inductively coupled plasma atomic emission spectrometry using internal standardization. The detection limits (3sigma, n=7) of iron(III), lead, and bismuth were 0.008, 0.137, and 0.073mug, respectively. The proposed method was applied to the analyses of metals and chlorides of cobalt, nickel, and copper.
研究了44种元素（由于铬（III、VI）、砷（III、V）和锑（III、V），共47种离子）在不同pH值下与磷酸钇的共沉淀行为。磷酸钇能在较宽的pH范围内定量共沉淀铁（III）、铅、铋和铟；然而，包括碱金属和含氧阴离子（如钒（V）、铬（VI）、钼（VI）、钨（VI）、锗（IV）、砷（III、V）、硒（IV）和碲（VI））在内的18种离子几乎不被收集。此外，包括钴、镍和铜（II）在内的19种离子在pH值约3以下时几乎不发生共沉淀。基于这些结果，研究了从钴、镍和铜（II）基体中分离铁（III）、铅和铋的方法。在pH 3.0时，0.5至25μg的铁（III）、铅和铋能够有效地从含有0.5g钴、镍或铜的溶液中分离出来。分离出的铁（III）、铅和铋可以通过使用内标法的电感耦合等离子体原子发射光谱法进行测定。铁（III）、铅和铋的检测限（3σ，n = 7）分别为0.008、0.137和0.073μg。所提出的方法应用于钴、镍和铜的金属及氯化物的分析。
