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 |
|---|---|---|
| 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/l 0,5 mg/l to 50 mg/l |
CD UV (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) |