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Application of a Cation‐Exchange Membrane to Determine Cations of Trace Metals in River Water
Author(s) -
Hung JiaJang,
Wong ChihChich
Publication year - 1992
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199200011
Subject(s) - chemistry , trace (psycholinguistics) , environmental chemistry , membrane , ion exchange , inorganic chemistry , ion , organic chemistry , biochemistry , philosophy , linguistics
Abstract Donnan‐membrane‐equilibrium graphite‐furnace atomic‐absorption spectrophotometry (DME‐GFAAS) has been developed to determine cations of trace metals in river water. The method employs a cation‐exchange membrane to separate metal cations from their complexes; both total and cationic forms of metals were determined by means of GFAAS. The sensitivity of the method for the measurement of trace metal cations is determined by the detection limits of GFAAS for the metals of interest. Comparable concentrations of metal cations in water from NBS and from the Erhjen river were obtained between the DME‐GFAAS and calculated (WATEQ4F) methods, indicating that the developed method is promising for natural fresh waters. The effect of pH on the distribution of metal cation in the NBS river water is significant for Cu and Pb; concentrations of these cations increase with decreasing pH. However, the concentrations of Cd and Zn cations do not vary with pH except that the concentration of the Zn cation decreases significantly as the pH value increases beyond 9. The method was applied to measure the capacity of complexing Cu in Chung‐Lu river water, which was estimated to be 2.3 μM.