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boiler water tests - sulphite

100ml 0f boiler water sample+ 2ml of H2SO4+ 1ml of starch solution+ add pottasium iodide iodate solution until sample turns blue, ppm of Na2SO4 = 12.5 * ml of sodium sulphate.(30-50ppm) idodate iodide reacts with starch to form blue colour, but it has a preference to sodium sulphite.( 30-50ppm)
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