フローインジェクション-吸光光度法による水の硬度測定
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概要
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A flow injection system is proposed for the rapid and simple determination of total water hardness with spectrophotometric detection. The method is based on the exchange reaction between calcium in the sample and the magnesium complex of EDTA at a medium of pH 10. Change in the absorbance of Hydroxynaphthol Blue (HNB), owing to the complex formation of HNB with magnesium, is measured spectrophotometrically at 645 nm for determining the sum of magnesium in the sample and magnesium liberated by this exchange reaction. A linear relationship was observed between the water hardness up to 103 mg CaCO_3/l and peak height. This system allows the analysis of ca. 80 samples per hour with the relative standard deviation of (0.9〜2.4)%. The results for analysis of tap and river waters agreed well with those obtained by standard EDTA titrations. Sample size injected is as little as 20μj for single analysis and no complicated manipulation is required.
- 社団法人日本分析化学会の論文
- 1984-02-05