ISO 10714:1992 PDF

Name: ISO 10714:1992 — Steel and iron — Determination of phosphorus content — Phosphovanadomolybdate spectrophotometric method
SKU: ISO 10714:1992
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Steel and iron — Determination of phosphorus content — Phosphovanadomolybdate spectrophotometric method

Название (английский):

ISO 10714:1992

Steel and iron — Determination of phosphorus content — Phosphovanadomolybdate spectrophotometric method

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 14 мая 1992 г.
Издание:: ISO IS 10714 edition 1 version 1
ICS:: 77.080.01

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Описание (английский):

The method is applicable with the following limitations: phosphorus contents between 0,001 0 % (m/m) and 1,0 % (m/m), application ranges and test portions in table 1 depending on the concentration of the interfering elements (arsenic, hafnium, niobium, tantalum, titanium, tungsten).

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 10714:1992 specifies a phosphovanadomolybdate spectrophotometric method for the determination of phosphorus in steel and iron. The method covers phosphorus contents from 0.0010% to 1.0% (m/m) and describes sample preparation, reagent requirements, colour development, extraction and spectrophotometric measurement. It replaces ISO 2732:1984 and includes informative annexes on cooperative test results and precision.

Key topics and technical requirements

Scope and limits: Applicable to P = 0.0010%–1.0% (m/m). Accuracy at the lower range depends on low levels of interfering elements.

Interfering elements: Arsenic (As), hafnium (Hf), niobium (Nb), tantalum (Ta), titanium (Ti) and tungsten (W) can interfere. The standard specifies application ranges and test portion masses (Table 1/2) depending on these elements; interferences can be reduced by complexation and using smaller test portions.

Sample preparation: Dissolution of test portion in oxidizing acid mixture followed by fuming (perchloric acid) and specific steps to oxidize/remove chromium where present.

Complexation and conversion: Silicon and refractory elements are complexed with hydrofluoric acid and orthoboric acid; phosphorus is converted to the phosphovanadomolybdate complex using ammonium metavanadate and hexa-ammonium heptamolybdate.

Extraction and measurement: The coloured complex is extracted into 4‑methyl‑2‑pentanone (isobutyl methyl ketone) with citric acid present and measured by spectrophotometry at ~355 nm using a 1 cm cell. Blank tests and daily-prepared reagents are required.

Calibration and calculation: Calibration graph prepared from phosphorus standards; blank correction applied and phosphorus content calculated from measured absorbance and dilution factors.

Precision: An international trial (20 laboratories in 12 countries) is reported. Precision assessment follows ISO 5725 (repeatability and reproducibility) and is provided in the standard.

Applications and users

Who uses it: Metallurgical laboratories, steel mills, quality control and certification labs, chemical analysts and research labs involved in steel and iron analysis.

Practical uses:

Routine determination of phosphorus in wrought steels, cast irons and pure iron.
Quality control during steel production where phosphorus specification compliance is required.
Inter-laboratory comparisons and method validation using prescribed precision data.

Why use ISO 10714: Provides a standardized, validated spectrophotometric procedure with guidance on handling interferences, calibration, and reporting-ensuring comparable, reproducible phosphorus results across laboratories.

Related standards

ISO 377-2 (sampling for composition)

ISO 385-1, ISO 648, ISO 1042 (laboratory glassware)

ISO 3696 (water for analytical use)

ISO 5725 (precision of test methods)

Keywords: ISO 10714, phosphorus determination, phosphovanadomolybdate, spectrophotometric method, steel and iron analysis, phosphorus content, interfering elements, calibration, ISO standards.

ISO 10714:1992 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 2732:1984

Steel and cast iron — Determination of phosphorus content — Phosphovanadomolybdate spectrophotometric method

ISO 5725-6:1994/Cor 1:2001

Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy va…

SIST EN ISO 10714:2024

Steel and iron - Determination of phosphorus content - Phosphovanadomolybdate spectrophotometric method (ISO…

SIST EN ISO 377:2017/A1:2025

Steel and steel products - Location and preparation of samples and test pieces for mechanical testing - Amend…

ISO 385-1:1984

Laboratory glassware — Burettes — Part 1: General requirements

ISO 6487:2015/Amd 1:2017

Road vehicles — Measurement techniques in impact tests — Instrumentation — Amendment 1

BS EN ISO 10427-1:2024

Oil and gas industries including lower carbon energy. Equipment for well cementing. Casing bow-spring central…

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)