Water quality -- Determination of dissolved anions by liquid chromatography of ions -- Part 3: Determination of chromate, iodide, sulfite, thiocyanate and thiosulfate

Document Number: NL ISO 10304 3 : 2010
Sector: Food Technology
TC: NL TC 147
ICS: 13.060.50
This part of IS0 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 Chromate (CrO,), clause 6 Iodide (I), clause 4 Sulfite (SO,), clause 5 Thiocyanate (SCN), clause 4 Working range ‘) 0,05 mg/l to 50 mg/l 0,l mg/l to 50 mg/l 0,l mg/l to 50 mg/l 0,5 mg/l to 50 mg/l 0,l mg/l to 50 mg/l Detector UV (h = 365 nm) CD or UV (h = 205 nm to 236 nm) AD (approximately 0,7 V to I,1 V) CD UV (h = 205 nm to 220 nm) CD or UV (h = 205 nm to 220 nm) AD (approximately 0,7 V to I,1 V) CD or UV (h = 205 nm to 220 nm) AD (approximately 0,7 V to I,1 V) Thiosulfate (S,O,), clause 4 0,l mg/l to 50 mg/l ‘) The working range is restricted by the exchange capacity of the columns. Dilute the sample into the working range if necessary.