AN ION-EXCHANGE ATOMIC-ABSORPTION METHOD FOR THE MEASUREMENT OF IONIZED CALCIUM AND MAGNESIUM AT MICROMOLAR CONCENTRATIONS

被引：5

作者：

HEWAVITHARANA, AK ^{[1
]}

KRATOCHVIL, B ^{[1
]}

机构：

[1] UNIV ALBERTA,DEPT CHEM,EDMONTON T6G 2G2,ALBERTA,CANADA

来源：

CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE | 1993年 / 71卷 / 01期

关键词：

D O I：

10.1139/v93-002

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A quantitative ion-exchange/atomic absorption method is described for measuring the concentration of free (hydrated) calcium and magnesium in solution at micromolar levels. Sample solutions are pumped through a micro-column of strong acid-type cation-exchange resin until equilibrium has been achieved between resin and solution. After removal of interstitial solution by first air, then water, the sorbed metal ion is eluted from the resin with nitric acid directly into an atomic absorption spectrophotometer. In a 0.1 M 1:1 electrolyte, here KNO3, the amount of metal ion sorbed on the resin is directly proportional to the free metal ion concentration in solution over a concentration range of 1.25 to 5 x 10(-5) mol/L (12-50 mumol/L). Selectivities for free calcium and magnesium in the presence of complexing ligands such as citrate and phosphate compare well with calculated values.

引用

页码：17 / 20

页数：4

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