在90℃下用1-(2-吡啶偶氮)-2-萘酚进行固液萃取后，用分光光度法测定钯。

Spectrophotometric determination of palladium after solid-liquid extraction with 1-(2-Pyridylazo)-2-naphthol at 90 degrees C.

作者信息

Gao J, Peng B, Fan H, Kang J, Wang X

机构信息

Department of Chemistry, Northwest Normal University, Lanzhou, 730070, People's Republic of China.

出版信息

Talanta. 1997 May;44(5):837-42. doi: 10.1016/s0039-9140(96)02122-4.

DOI:10.1016/s0039-9140(96)02122-4

PMID:18966809

Abstract

An effective spectrophotometric determination of palladium with 1-(2-pyridylazo)-2-naphthol (PAN) using molten naphthalene as a diluent has been studied. A green complex of palladium with PAN is formed at 90 degrees C. In the range of pH 1.5-7.5, the complex is quantitatively extracted into molten naphthalene. The organic phase is anhydrously dissolved in CHCl(3) to be determined spectrophotometrically at 678 nm against the reagent blank. Beer's law is obeyed over the concentration range of 0.5-10 ppm. The molar absorptivity and Sandell's sensitivity are 1.2 x 10(4) l mol(-1) cm(-1) and 0.0070 mg cm(-2), respectively. The optimum conditions for determination are obtained. The interferences of various ions are observed in detail. The method has been applied to the determination of palladium in synthetic samples.

摘要

研究了以熔融萘为稀释剂，用1-（2-吡啶偶氮）-2-萘酚（PAN）对钯进行有效分光光度测定的方法。钯与PAN在90℃形成绿色络合物。在pH 1.5 - 7.5范围内，该络合物定量萃取到熔融萘中。有机相无水溶解于CHCl₃中，以试剂空白为参比，在678 nm处进行分光光度测定。在0.5 - 10 ppm浓度范围内符合比尔定律。摩尔吸光率和桑德尔灵敏度分别为1.2×10⁴ l·mol⁻¹·cm⁻¹和0.0070 mg·cm⁻²。获得了测定的最佳条件。详细观察了各种离子的干扰情况。该方法已应用于合成样品中钯的测定。