DIN ISO 22743:2015-08

Methods using flow analysis automate wet chemical procedures and are particularly suitable for the processing of many analytes in water in large sample series at a high analysis frequency. Analysis can be performed by flow injection analysis (FIA) or by continuous flow analysis (CFA). Both methods share the feature of an automatic dosage of the sample into a flow system (manifold) where the analytes in the sample react with the reagent solutions on its way through the manifold. The sample preparation may be integrated in the manifold. The reaction product is measured in a flow detector (for example, flow photometer). The detector produces a signal from which the concentration of the parameter is calculated. It is necessary to examine whether and to what extent particular problems will require the specification of additional marginal conditions. This International Standard specifies a CFA method for the determination of sulfate in various types of water (such as ground water, drinking water and waste water). The method is applicable to samples with a sulfate (SO4) mass concentration from 30 mg/l to 300 mg/l. Other concentration ranges are applicable, provided they cover exactly one decade of concentration units (for example 100 mg/l to 1 000 mg/l). This document has been prepared by Technical Committee ISO/TC 147 "Water quality", the secretariat of which is held by DIN (Germany). The responsible German committee is NA 119-01-03 AA "Wasseruntersuchung" ("Water examination") at DIN Standards Committee Water Practice (NAW).