Issue 3, 2002

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

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.

Article information

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

Analyst, 2002,127, 424-427

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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