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ISO 10304-3:1997 Water quality - Determination of dissolved anions by liquid chromatography of ions - Part 3: Determination of chromate, iodide, sulfite, thiocyanate and thiosulfate
standard by International Organization for Standardization, 08/01/1997
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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 | ||
|---|---|---|
| 1) The working range is restricted by the exchange capacity of the columns. Dilute the sample into the working range if necessary. | ||
| Anion | Working range 1) | Detector |
| Chromate (CrO4), clause 6 | 0,05 mg/l to 50 mg/l | UV ( = 365 nm) |
| Iodide (1), clause 4 | 0,1 mg/l to 50 mg/l | CD or UV ( = 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( = 205nmto220nm) | |
| Thiocyanate (SCN), clause 4 | 0,1 mg/l to 50 mg/l | CD or UV ( = 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 ( = 205 nm to 220 nm) AD (approximately 0,7 V to 1,1 V) |