ISO 2223:1972
Formaldehyde solutions for industrial use — Limit test for heavy metals (excluding iron)
Reference number
ISO 2223:1972
ISO 2223:1972
Edition 1
1972-11
1972-11
© ISO 2024
Withdrawn
Abstract
The method detects only the heavy metals present in non-complex form, the sulphides of which are precipitated in acid solution. The method is not specific for any one heavy metal. The principle consists in conversion of heavy metal, such as lead and copper, in acid solution to their sulphides, and comparison of the colour produced with that given by an aliquot volume of standard lead solution treated with hydrogen sulphide in the same way.
Life cycle
Got a question?
Check out our FAQs
Customer care
+41 22 749 08 88
Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)