ISO 1975:1973 PDF

Name: ISO 1975:1973 — Magnesium and magnesium alloys — Determination of silicon — Spectrophotometric method with the reduced silicomolybdic complex
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Magnesium and magnesium alloys — Determination of silicon — Spectrophotometric method with the reduced silicomolybdic complex

Название (английский):

ISO 1975:1973

Magnesium and magnesium alloys — Determination of silicon — Spectrophotometric method with the reduced silicomolybdic complex

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 ноября 1973 г.
Издание:: ISO IS 1975 edition 1 version 1
ICS:: 77.120.20

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Описание (английский):

The method is applicable to alloys having silicon contents between 0,01 and 0,6 %. The method does not apply to alloys containing rare earths or thorium. Specifies principle and procedure of the method, the reagents, apparatus, sampling, expression of results and test report.

Abstract

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Overview

ISO 1975:1973 specifies a spectrophotometric method for the determination of silicon (Si) in magnesium and magnesium alloys using the reduced silicomolybdic complex. First published in 1973, the method is applicable to alloys with silicon contents between 0.01% and 0.6% (m/m). It defines the principle, reagents, apparatus, sampling/test portions, calibration procedure, measurement at about 810 nm, result expression and test reporting. The procedure does not apply to alloys containing rare earths or thorium.

Key topics and technical requirements

Principle: attack of sample by sulphuric acid and bromine, complexation and formation of an oxidized silicomolybdic complex followed by selective reduction to a blue complex measured spectrophotometrically (~810 nm).

Applicable silicon range: 0.01–0.6%; two calibration curves are prepared to account for magnesium matrix effects.

Reagents (examples given in the standard):

Bromine water, sulphuric acid (approx. 10 N and 1 N), potassium fluoride (50 g/L), boric acid (saturated ≈ 40 g/L)
Molybdic solutions (e.g., sodium molybdate 195 g/L or ammonium molybdate 140 g/L)
Tartaric acid (200 g/L), ascorbic acid (20 g/L)
Silicon standard solutions (0.100 g/L and 0.010 g/L)

Apparatus and precautions:

Spectrophotometer (calibrated cells, optical path typically 1 cm), pH meter with glass electrode, and clean laboratory glassware; platinum containers for fusing silica standards.
pH control during reagent preparation and colour development (pH ranges specified depending on molybdate reagent).

Procedure elements:

Test portion sizes: typically 1 g (for 0.01–0.05% Si) or 0.5 g (for 0.05–0.6% Si)
Preparation of matched standards and calibration curves, timed colour development, blank and check tests to confirm no unwanted reduction of Mo(VI).

Results: silicon content calculated from calibration curves with blank correction and expressed as mass percent; the report must include method reference, results, sample details and any unusual features.

ISO 1975:1973 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

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