ANIONS: IC columns used with chemical suppression

The disinfection byproducts generated in water processing plants are suspected to be not only a health hazard but could even be carcinogenic. For this reason the oxyhalides, above all the bromate that is generated from bromide during the ozone treatment of drinking water, have become the object of many investigations and standard methods (e.g., EPA 300.1 Part B, EPA 317.0). Metrohm now presents a high-performance separation column for the simultaneous determination of the standard anions, the oxyhalides and dichloroacetic acid. With the A Supp 7 these ions can be determined reliably and precisely down to the lower ppb range. The outstanding detection sensitivity is obtained by applying the 5-µm polyvinylalcohol material, which yields extremely high plate numbers and accordingly has excellent separation and detection characteristics. Additionally the separations may be adapted to the requirements of the application by changing the temperature.