This International Standard specifies a method for the determination of dissolved bromate in water (e.g. drinking water, mineral water, raw water, surface water, partially treated water or swimming pool water). Appropriate pretreatment of the sample (e.g. dilution) allows determination of bromate at concentrations 0,5 μg/l. The working range is restricted by the ion-exchange capacity of the separator column. Dilution of the sample to the bromate working range can be necessary.