ISO 2214:1972

Boric acid, boric oxide and Disodium tetraborates for industrial use — Determination of manganese content — Formaldehyde oxime photometric method ISO 2214:1972

Publication date:   Jul 1, 1972

95.99 Withdrawal of Standard   May 27, 2002

General information

95.99 Withdrawal of Standard   May 27, 2002

ISO

ISO/TC 47 Chemistry

International Standard

71.060.01   Inorganic chemicals in general

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Scope

The principle consists in removal of the boron by evaporation with methanol and separation of manganese and other metals from the residue, by extraction with chloroform, as their diethyldithiocarbamates. Wet destruction of the diethyldithiocarbamates with a sulphuric acid/ hydrogen peroxide mixture. Removal of any interfering iron by extraction as the thiocyanate. Formation of the coloured manganese formaldoxime complex in alkaline solution and photometric measurement at a wavelength of approximately 450 nm.

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WITHDRAWN
ISO 2214:1972
95.99 Withdrawal of Standard
May 27, 2002