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Issue 3, 2002
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Monitoring the removal of carbonate from alkali metal hydroxide solutions using gas diffusion flow injection

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Abstract

Monitoring the removal of carbonate from alkali metal hydroxide (MOH, M = K, Na) solutions with calcium oxide (CaO) was studied using a newly developed method for the determination of trace amounts of total carbonate (TC) in alkaline solutions based on a flow injection (FI) technique coupled with a gas diffusion system. The optimized conditions of the FI system were as follows: the flow rate of each carrier, reaction solution (H2SO4) and receptor solution (Cresol Red, pH 8.9) was 0.25 ml min−1, the sample size was 0.1 ml and the concentration of H2SO4 in the reaction solution was 0.09 M. The limit of detection of TC by the proposed method was 4 × 10−7 M. The removal efficiency of carbonate was affected by the amount of CaO added, the shaking time of the solutions and the concentration of MOH. For 1 M NaOH and KOH solution, the removal efficiency of carbonate was about 99% and the concentration of residual carbonate was 4 × 10−5 and 1.2 × 10−4 M, respectively, when the amount of CaO added was 2 g l−1 and the shaking time was 16 h.

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Article information


Submitted
25 Oct 2001
Accepted
14 Dec 2001
First published
01 Feb 2002

Analyst, 2002,127, 424-427
Article type
Paper

Monitoring the removal of carbonate from alkali metal hydroxide solutions using gas diffusion flow injection

Y. Wei, M. Oshima and S. Motomizu, Analyst, 2002, 127, 424
DOI: 10.1039/B109771G

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