Standards Development
This Working Draft describes the procedure for the determination of fluorine in copper, lead and zinc sulphide concentrates by sodium hydroxide fusion and fluoride ion selective electrode (FISE) detection. Fluoride ions are leached from the sodium hydroxide fusion and presented to the FISE. Potential interfering ions are masked by the use of a complexing agent and control of solution pH.
The method is applicable to fluorine in the following ranges:
Copper concentrates 0.005 – 0.3%
Lead concentrates 0.005 – 0.2%
Zinc concentrates 0.005 – 0.1%
Fluorine in copper, lead and zinc concentrates is often a penalty element in the trading. However, the fluorine analytical method is not standardized, and the producers and smelters use their own analytical method.
Consider the following: Is there a verified market need for the proposal? What problem does this standard solve? What value will the document bring to end-users? See Annex C of the ISO/IEC Directives part 1 for more information. See the following guidance on justification statements on ISO Connect: https://connect.iso.org/pages/viewpage.action?pageId=27590861
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