Determination of titanium(IV) and chromium(VI) with 2,7-dichlorochromotropic acid and 1,5-diphenylcarbazide on the solid phase

被引：0
|
作者：
Shvoeva, O. P. [1 ]
Dedkova, V. P. [1 ]
Savvin, S. B. [1 ]
Grechnikov, A. A. [1 ]
机构：
[1] Russian Acad Sci, Vernadsky Inst Geochem & Analyt Chem, Moscow 119991, Russia
来源：
JOURNAL OF ANALYTICAL CHEMISTRY | 2015年 / 70卷 / 08期
基金：
俄罗斯基础研究基金会;
关键词：
Ti(IV); Cr(VI); diffuse reflection spectroscopy; PANV-KU-2; PANV-AV-17; 2,7-dichlorochromotropic acid; 1,5-diphenylcarbazide;
D O I：
10.1134/S106193481508016X
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Possibility of the selective determination of Ti(IV) and Cr(VI) by diffuse reflection spectroscopy after their simultaneous adsorption from one sample on a two-layer substrate is studied. Titanium(IV) is adsorbed on a fiber filled with a cation exchanger (PANV-KU-2) and determined with 2,7-dichlorochromo-tropic acid; chromium(VI) is adsorbed on a fiber filled with an anion exchanger (PANV-AV-17) and determined with 1,5-diphenylcarbazide. Conditions are selected for the simultaneous adsorption of titanium and chromium in the batch and dynamic modes. Conditions are optimized for the determination of titanium with 2,7-dichlorochromotropic acid on PANV-KU-2. The selectivity of titanium and chromium determination in the presence of foreign ions is studied. Calibration graphs are linear in the ranges 5-40 and 2-20 ng/mL for Ti(IV) and Cr(VI), respectively; the detection limits are 4 and 2 ng/mL. The possibility of determining Ti(IV) and Cr(VI) in one sample at their ratios from 5: 1 to 1: 4 is shown.
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页码：915 / 919
页数：5
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