Water quality - Determination of dissolved anions by liquid chromatography of ions - Part 3: Determination of chromate, iodide, sulfite, thiocyanate and thiosulfate
This part of ISO 10304 specifies methods for the determination in aqueous solution of the dissolved anions
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 |
| Chromate (CrO4), clause 6 | 0,05 mg/l to 50 mg/l | UV (λ = 365 nm) |
| Iodide (1), 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/l | CD |
| 0,5 mg/l to 50 mg/l | UV(λ = 205nmto220nm) | |
| 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) |
| Thiosulfate (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) |
| 1) The working range is restricted by the exchange capacity of the columns. Dilute the sample into the working range if necessary. | ||
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