To demonstrate that oxyhalides and bromide can be successfully determined at concentrations required for regulatory standards and guidelines using a Thermo Scientific™ Dionex™ ion chromatography system equipped with a Thermo Scientific™ Dionex™ IonPac™ AS23-4μm column,Thermo Scientific™ Dionex™ CRD 300 Carbonate Removal Device, and a Thermo Scientific™ Dionex™ AERS™ 500 Carbonate Anion Electrolytically Regenerated Suppressor.

Ion chromatography is a well-established technique for determining inorganic anions in acid rain. This Technical Note describes the determination of inorganic anions in rain samples by employing high-pressure ion chromatography (HPIC) and the use of a 4 µm particle size column, the Dionex IonPac AS18-4µm.

Laboratories split their methods because good resolution for the major inorganic anion peaks and a low LOD for bromate determination is a difficult compromise to achieve. This application is a 2 channels method for the determination of fluoride, chloride, chlorite, chlorate, bromide, bromate, nitrite, nitrate, sulfate, and phosphate in different types of water samples without compromise between the sample volume injected in the chromatographic system and a low limit of quantification suitable for trace bromate determinations. An ICS-6000 can be used for this application.

Ozone is a powerful drinking water disinfectant that is effective in treating chlorine resistant organisms. Ozonation is an effective disinfection process that is used worldwide, but will produce bromate if the source water contains bromide. Bromate is a potential human carcinogen and its concentration in drinking water is regulated in many countries. This application update shows that bromate, chlorate, and chlorite can be determined with an isocratic hydroxide eluent to easily meet current bromate regulations.

In this application note, we compare the Dionex IonPac AS19 using an electrolytically generated hydroxide eluent to the AS23 column using an electrolytically generated carbonate/bicarbonate eluent for the determination of chlorite, bromate, and chlorate in natural mineral waters. We compare the linearity, method detection limits, precisions, and recovery for three mineral waters obtained from three European countries to determine whether these columns have the sensitivity required to meet current EPA and EU requirements. This record describes the IonPac AS23 method.