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Boiler water tests: Chloride test.

Take sample after P-alkalinity so that all carbonates and hydroxides are delt with and chlorides can be tested alone. [add 2ml of sulphuric acid(to make sample acidic to speed up reaction) + 2ml of potassium chromate indicator and titrate with 35.5 silver nitrate until a brown colour appears. ppm of cl= ml of silver nitrate used * 10. silver nitrate has more affinity to chlorides than to chromates. ( max=50ppm)
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