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Simple and high-sensitivity colorimetric analysis of cadmium using homogeneous liquid-liquid extraction

Colorimetric determination with dithizone (diphenylthiocarbazone) is a simple method that has been applied to analyze cadmium (Cd) ions in water. However, determining concentrations close to the environmental standard value (3 μgL ) using this method is difficult because of its low sensitivity. Here...

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Published in:Analytical sciences 2022-01, Vol.38 (1), p.223
Main Authors: Manaka, Atsushi, Ueno, Yumemi, Tafu, Masamoto, Kato, Takeshi
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Ueno, Yumemi
Tafu, Masamoto
Kato, Takeshi
description Colorimetric determination with dithizone (diphenylthiocarbazone) is a simple method that has been applied to analyze cadmium (Cd) ions in water. However, determining concentrations close to the environmental standard value (3 μgL ) using this method is difficult because of its low sensitivity. Herein, we exploited the phase separation phenomenon to generate a small amount of the extraction phase by adding a mixture of 2-propanol and a small amount of chloroform to a water sample, as a pre-concentration method for the Cd(II) ions. The obtained Cd(II)-dithizone complex was successfully extracted into this phase. We then constructed a simple and highly sensitive colorimetric analysis method for the ppb level of Cd(II) using this phase separation technique.
doi_str_mv 10.2116/analsci.21N029
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subjects Cadmium - analysis
Chloroform
Colorimetry
Liquid-Liquid Extraction
Water
title Simple and high-sensitivity colorimetric analysis of cadmium using homogeneous liquid-liquid extraction
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