Characterization of oxyanions of chlorine by multipath titrimetric approach for drinking water quality control

Abstract

The analysis of oxyanions, perchlorate, chlorate, chlorite and hypochlorite ions, is of interest, especially from the viewpoint of evaluating drinking water quality. Instrumental analyses are generally performed to quantify them, and require a standard solution of corresponding ions; however, no standard solutions characterized by a metrologically valid procedure have existed. In the present study, perchlorate, chlorate and chlorite ions were characterized by performing multipath titration techniques. This technique is an approach to determine the amount of substances in chemicals by employing different stoichiometric reactions. It has decreased the risk and the contribution of unknown biases that each measurement method has, and gives further reliable results than those based on a conventional single titration method. The comprehensive evaluation of the measurement uncertainties for these assays was carried out, resulting in the establishment of the measurement methodologies for oxyanion standards.

Geochemical characterization and WQI based assessment of groundwater health risk using GIS in tropical river basin: Case study in Kirama-ara River basin, Southern Province, Sri Lanka.

“…AgNO3 back titration was used to determine the Clconcentration (Argentometric technique). A K2CrO4 solution (yellowish green to reddish brown) was used as an indicator (Asakai, 2022). Using a UV visible Recording spectrophotometer, the amounts of nitrate (NO3 -), sulphate (SO4 2-), and phosphate (PO4 3-) ions were measured (Model -UV-160).…”

Geochemical Characterization and Water Quality Index Based Assessment of Groundwater Quality Using GIS In Tropical River Basin: Case Study in Kirama-Ara River Basin, Southern Province, Sri Lanka.

“…The Clconcentration was determined using AgNO3 back titration (Argentometric technique). As an indicator, a K2CrO4 solution (yellowish green to reddish brown) was utilized (Asakai, 2022). Using a UV visible…”

Geochemical Characterization and Water Quality Index Based Assessment of Groundwater Quality Using GIS in Tropical River Basin

“…The Clconcentration was determined using AgNO3 back titration (Argentometric technique). As an indicator, a K2CrO4 solution (yellowish green to reddish brown) was utilized (Asakai, 2022). Using a UV visible Recording spectrophotometer (Model -UV-160), the amounts of nitrate-N (NO3 --N) (salicylic acid method), sulphate (SO4 2-) (Ascorbic acid method), and phosphate (PO4 3-) ions were measured.…”