作者:A. Golwelker、K. S. Patel、R. K. Mishra
DOI:10.1246/bcsj.63.605
日期:1990.2
A new, simple, rapid, and selective spectrophotometric method for determining Cr(VI) by extraction with hydroxyamidines in chloroform over 0.2–0.8 M HCl is described. The molar extinction coefficient of the complexes of Cr(VI) with 10 different hydroxyamidines lie in the range of (1.30– 1.52)×104 l mol−1 cm−1 at λmax 390–400 nm. Of these, the simplest compound, N-hydroxy-N,N′-diphenylbenzamidine (HDPBA) has been chosen for the detailed studies. The limit for detection is 0.1 μg Cr/cm3. The composition of the complex, and the effect of solvents, acids and diverse ions on the extraction of the metal are discussed. The method is free from interference of most of the metal ions except Mn(VII) which is removed by reducing with sodium nitrite. The method has been applied for determination of chromium(VI) to water samples containing the metal at ppb levels.
介绍了一种新的、简单、快速和选择性的分光光度法,该方法通过在氯仿中用 0.2-0.8 M HCl 萃取羟基酰胺来测定 Cr(VI)。在 λmax 390-400 nm 处,Cr(VI)与 10 种不同羟基酰胺的摩尔消光系数范围为 (1.30- 1.52)×104 l mol-1 cm-1。其中,最简单的化合物 N-羟基-N,N′-二苯基苯甲脒(HDPBA)被选为详细研究的对象。检测限为 0.1 μg Cr/cm3。讨论了络合物的组成以及溶剂、酸和不同离子对金属萃取的影响。该方法不受大多数金属离子的干扰,但 Mn(VII) 除外。该方法已被用于测定含有ppb级金属的水样中的铬(VI)。