Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
Colorimetric Determination of Magnesium Ion with Xylidylblue
Studies on the Automatic Analysis of Salt Manufacturing Samples (Part 4)
Takahiro KANOUShizuo SUGITA
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1981 Volume 35 Issue 1 Pages 28-32


In order to determine automatically the magnesium ion of salt manufacturing samples, the authors made an investigation on Technicon's auto-analyzer by the colorimetric method with xylidylblue-II reagent, and then examined the effects of ethanol concentration of sample solution and of coexisting ions. The following were the results obtained from this study: 1) The reaction between magnesium ion and xylidylblue-II reagent is influenced by the alcoholic concentration. Therefore, it is necessary to control the alcoholic concentration to 54%(the final content). 2) Interference by the coexisting ions such as Na+ and Ca2+can be eliminated by the addition of G-EDTA reagent.
In this method, a linear relationship is obtained between the absorbance and the concentration of magnesium ion in the range of 0-20mg/l.
This method has the same accuracy as the conventional EDTA method, and can analyze continuously 15-20 samples per hour.

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