BS 2690-101:1984

Gives three methods, by iodometric titration, applicable to from 0.02 mL/L or 0.03 mg/L up to supersaturation in up to a 250 mL test portion, by an indigo carmine Nessleriser method, for from 0.005 mL/L or 0.007 mg/L up to 0.12 mL/L or 0.17 mg/L and by an amperometric method, applicable from 0.00007 mL/L or 0.0001 mg/L up to 0.70 mL/L or 0.10 mg/L in up to a 260 mL test portion.

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