ISO 6920:1984 PDF
Crude sodium borates for industrial use — Determination of total and alkali-soluble calcium and magnesium contents — Titrimetric method
Open preview (PDF)Crude sodium borates for industrial use — Determination of total and alkali-soluble calcium and magnesium contents — Titrimetric methodCrude sodium borates for industrial use — Determination of total and alkali-soluble calcium and magnesium contents — Titrimetric method
- Document status:
- Withdrawn
- Format:
- Electronic (PDF)
- Number of pages:
- 6
- Publication date:
- November 1, 1984
- Edition:
- ISO IS 6920 edition 1 version 1
- ICS:
- 71.060.50
The calcium content is determined by titration of an aliquot portion of the test solution with ethyleneglycol-bis-(2-aminoethyl)-N,N,N',N'-tetra acetic acid, disodium salt (EGTA) solution using 2-carboxy-2'-carboxy-2'-hydroxy-5'-sulphoformazylbenzene (Zincon) as indicator. The combined magnesium and calcium contents are determined by titration of a further aliquot portion of the test solution with ethylenediaminetetra-acetic acid, disodium salt (EDTA) solution, using Mordant black 11/potassium chloride as indicator, after addition of triethanolamine solution and buffer solution. The magnesium content is calculated by difference.
Technical details
- Technical committee
- ISO/TC 47 - Chemistry
- SKU
- ISO 6920:1984
