BS EN ISO 10304-3:1997

Water quality. Determination of dissolved anions by liquid chromatography of ions. Determination of chromate, iodide, sulfite, thiocyanate and thiosulfate | Status: Under review, Current

1 Scope This part of ISO 10304 specifies methods for the determination in aqueous solution of the dissolved anions

• — iodide, thiocyanate and thiosulfate (clause 4);
• — sulfite (clause 5);
• — chromate (clause 6).

An appropriate pretreatment of the sample (e.g. dilution) and the application of a conductivity detector (CD), UV detector (UV) or amperometric detector (AD) make the working ranges given in table 1 feasible. Table 1 — Applicable working ranges Anion Working range 1) Detector 1) The working range is restricted by the exchange capacity of the columns. Dilute the sample into the working range if necessary. Chromate (CrO4), clause 6 0,05 mg/l to 50 mg/l UV (λ = 365 nm) Iodide (I), clause 4 0,1 mg/l to 50 mg/l CD or UV (λ = 205 nm to 236 nm)AD (approximately 0,7 V to 1,1 V) Sulfite (SO3), clause 5 0,1 mg/l to 50 mg/l0,5 mg/l to 50 mg/l CDUV (λ = 205 nm to 220 nm) Thiocyanate (SCN), clause 4 0,1 mg/l to 50 mg/l CD or UV (λ = 205 nm to 220 nm)AD (approximately 0,7 V to 1,1 V) Thiosuifate (S2O3), clause 4 0,1 mg/l to 50 mg/l CD or UV (λ = 205 nm to 220 nm)AD (approximately 0,7 V to 1,1 V)