The Analysis on the Evaluation of Shanghai Tap Water Quality in Terms of Inorganic Anion Concentration

摘要

By taking tap water samples from every district and county in Shanghai, we analyze six types of inorganic anions contained in these water samples, namely Cl~-, Br~-, (NO_3)~-, (NO_2)~-, (PO_4)~(3-) and (SO_4)~(2-), by applying the Ion Chromatography System. The results indicate that among these six inorganic anions in Shanghai tap water, Cl-has the highest concentration while (NO_2)~- the lowest. Using the Nemerow Index in evaluating the inorganic anions in Shanghai tap water, we find that the average compliance rate of tap water in Shanghai is 58.3 percent, and that phosphorus pollution is serious. When (PO_4)~(3-) is not calculated, tap water in Shanghai can be labeled as light pollution in general, from the suburbs to city areas tending to be cleaner; when (PO_4)~(3-) is calculated, tap water in Shanghai is moderately polluted, and pollution in coastal areas is more serious than in inner areas.