高酸度条件下单波长、双峰双波长分光光度法测定铬(Ⅵ)

高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (4): 322.

高酸度条件下单波长、双峰双波长分光光度法测定铬(Ⅵ)

王振清, 许光惠, 沈含熙

南开大学化学系

收稿日期:1986-01-11 出版日期:1987-04-24 发布日期:1987-04-24

The Determination of Chromium(Ⅵ) in the High Acidic Medium by Mono- and Dual- Wavelength Spectrophotometry

Wang Zhenqing, Xu Guanghui, Shen Hanxi

Department of Chemistry, Nankai University, Tianjin

Received:1986-01-11 Online:1987-04-24 Published:1987-04-24

摘要/Abstract

摘要： 铬(Ⅵ)的测定,在金属材料的分析中具有重要意义。目前,铬的测定仍采用二苯卡巴肼法,该法的灵敏度虽较高(ε=34600),但由于显色剂的稳定性很差,显色剂溶液和工作曲线需当天配制和绘制,除给操作带来许多麻烦外,还造成大量试剂的浪费。

Abstract: A simple and rapid spectrophotometric method for the determination of chromium (Ⅵ) with 9-orthochloropheny1-2,3,7-trihydroxyfluorone (o-Cl-pF) has been investigated. This method is based on the formation of a complex in the hydrochloric and phosphoric acid medium (0.4N HCl+3N H₃PO₄).The complex has an absorption maximum at 497nm. The value of molar absorption cofficient is 2.33×10⁴at λ_515nm. Beer' s law is obeyed over the range 0-30μg/25ml of Cr.The two wavelengths for the determination of 0-10μg/25ml of Cr by using dual-wavelength method are 462 and 497nm. By using the proposed method, the Cr contents in alloy and metallic materials were determined with satisfactory results.

TrendMD:

王振清, 许光惠, 沈含熙. 高酸度条件下单波长、双峰双波长分光光度法测定铬(Ⅵ). 高等学校化学学报, 1987, 8(4): 322.

Wang Zhenqing, Xu Guanghui, Shen Hanxi . The Determination of Chromium(Ⅵ) in the High Acidic Medium by Mono- and Dual- Wavelength Spectrophotometry. Chem. J. Chinese Universities, 1987, 8(4): 322.