ISO 9779:1993
Metallurgical-grade fluorspar — Determination of lead content — Solvent extraction atomic absorption spectrometric method
Reference number
ISO 9779:1993
Edition 2
1993-04
Withdrawn
ISO 9779:1993
17642
Withdrawn (Edition 2, 1993)

Abstract

The principle of the method specified is to decompose a test portion by a mixture of nitric, hydrofluoric and perchloric acids, dissolving the salts in hydrochloric acid after evaporation to dryness, extracting the lead from a dilute hydrochloric acid solution of the decomposed test portion into a solution of tri-n-octylphosphine oxide in 4-methyl-2-pentanone, aspirating the extract into the air/acetylene flame of an atomic absorption spectrometer, and measuring the absorbance at 283,3 nm. Applies to products having lead contents in the range 0,0006 % (m/m) to 0,01 % (m/m).

General information

  •  : Withdrawn
     : 1993-04
    : Withdrawal of International Standard [95.99]
  •  : 2
     : 6
  • ISO/TC 175
    73.080 
  • RSS updates

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)