Water quality is one of the essentials of a healthy life. To ensure clean water, a number of purification processes are used. Of course any purification process has by-products, monitoring these is essential to a healthy water supply.
Safe levels of disinfection by-products
Professional production of drinking water requires sophisticated purification. Chlorite, chlorate, and the carcinogenic bromate are by-products of the disinfection process.
Their determination at very low detection limits in the presence of the standard ions is regulated by various standards and norms, among them US-EPA 300.1 A and B, ASTM D6581-12, and DIN EN ISO 10304-4-1999. By the use of high capacity separation columns, safe levels of disinfection by-products can be detected and maintained for drinking water from a wide range of sources.
Metrohm offers the Metrosep A Supp 7 – 250/4.0 as the preferred column for this application. This column excels by its outstanding separation of the oxohalides in very low concentrations from the standard anions, which may be present in the mg/L range.
Besides the oxohalides, the Metrosep A Supp 7 also enables …
- the determination of organic acids such as glycolate, acetate, formiate, malonate, succinate, and oxalate.
- gradients to optimize applications.
- fast determination of thiosulfate, thiocyanate, and perchlorate.
Disinfection by-products and standard anions according to EPA 300.1 A & B
In Application Note S-312 Metrohm describes the separation of standard anions and oxyhalides performed on the 930 Compact IC Flex instrument after Inline Ultrafiltration. Both anions and oxyhalides can be determined in one single run; the determination complies with EPA 300.1 part A and part B.
