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  • ISO
    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
    Edition: 1997
    $386.77
    / user per year

Content Description

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
AnionWorking range 1)Detector
Chromate (CrO4), clause 60,05 mg/l to 50 mg/lUV (λ = 365 nm)
Iodide (1), clause 40,1 mg/l to 50 mg/lCD or UV (λ = 205 nm to 236 nm) AD (approximately 0,7 V to 1,1 V)
Sulfite (SO3), clause 50,1 mg/l to 50 mg/lCD
0,5 mg/l to 50 mg/lUV(λ = 205nmto220nm)
Thiocyanate (SCN), clause 40,1 mg/l to 50 mg/lCD or UV (λ = 205 nm to 220 nm) AD approximately 0,7 V to 1,1 V)
Thiosulfate (S2O3), clause 40,1 mg/l to 50 mg/lCD 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.


About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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