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A flow-injection analysis (FIA) new method of a continuous ion-exchange pretreatment and separation is given for the simultaneous determination of silicate and phosphate in biological samples. To remove interfering cations, the sample solution passes through the mini cation-exchange column connected at the inlet and outlet of one of the loading loops of a two-channel valve, and it again passes through another loading loop of the valve for sampling. After the valve is switched to the inject position, the defined sample is injected and passed through the seperation column, and silicate and phosphate ions in the sample zone are separated. At the same time, the mini cation-exchange column is switched to the regeneration position and regenerated by a regenerant. By this manner, the sample pretreatment and determination can be made continuously. The approach is extendable to other anion analyses in various biological samples without matrix matching. This article gives a description of simultaneously determining silicate and phosphate in human hair, mussel, tea leaves, sargasso, and rice flour with the flow-injection system. Regression equations of the

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Author

Yong-Sheng Li

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); VCH Publishers; Wiley (ISSN 0895-7533)

Published

1997

Language

EN

Field

Engineering (Physical Sciences)