ISO 4749:1984 PDF

Name: ISO 4749:1984 — Copper alloys — Determination of lead content — Flame atomic absorption spectrometric method
SKU: ISO 4749:1984
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Copper alloys — Determination of lead content — Flame atomic absorption spectrometric method

Название (английский):

ISO 4749:1984

Copper alloys — Determination of lead content — Flame atomic absorption spectrometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 1 марта 1984 г.
Издание:: ISO IS 4749 edition 1 version 1
ICS:: 77.120.30

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Описание (английский):

The method is applicable to contents of lead as an alloying element or an impurity between 0.01 and 5.0 % (m/m). By appropriate modification of sample mass, the lower limit may be extended to 0.002 % (m/m). ISO 4749 specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.

Abstract

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Упомянутые в описании и другие стандарты ISO

Overview

ISO 4749:1984 is an internationally recognized standard published by the International Organization for Standardization (ISO) that defines the method for determining lead content in copper alloys using flame atomic absorption spectrometry (FAAS). This standardized analytical procedure applies to measuring lead both as an intentional alloying element and as an impurity. ISO 4749 specifies the full analytical process, including reagents, apparatus, sample preparation, testing procedure, and expression of results to ensure accurate and reproducible lead content determinations.

The standard targets lead concentrations ranging from 0.01% to 5.0% by mass in copper alloys, with the possibility of lowering the detection limit to 0.002% through modifications in the sample size. Its wide international acceptance and precision make it a critical reference method for laboratories working with copper alloy compositions.

Key Topics

Scope and Application Applicable to all types of copper alloys covered by ISO material standards, the method quantifies lead content either as an alloying constituent or as an impurity. It allows precise quantitative measurement down to 0.002% lead in optimal conditions.

Method Principle The method involves dissolving a test portion of the copper alloy sample in a fluoroboric-nitric acid mixture, followed by aspiration of the solution into the air-acetylene flame of an atomic absorption spectrometer. The lead content is measured by detecting absorbance at the 217.0 nm spectral line emitted by a hollow cathode lead lamp.

Sample Preparation and Reagents Samples are typically prepared as fine chips or drillings to maximize dissolution efficiency. Key reagents include fluoroboric-nitric acid for sample digestion, and standard lead and copper solutions used to prepare calibration curves for quantification.

Calibration and Measurement A series of standard matching solutions, mirroring the copper and acid matrix of the samples, are prepared for calibration. The flame atomic absorption spectrometer is adjusted for optimal measurement at the lead absorption wavelength, and multiple bracketing measurements are conducted for precision.

Expression of Results The lead content is calculated by comparing absorbance values of the sample to those of calibration standards and blank tests. Results are expressed as a percentage by mass of lead in the copper alloy sample, accompanied by documentation including sample identification, method reference, results, and any deviations or unusual observations.

Applications

Quality Control in Copper Alloy Manufacturing ISO 4749:1984 provides manufacturers with a reliable and standardized method to monitor lead content, ensuring compliance with material specifications and product quality.

Material Compliance Testing Regulatory bodies and certification organizations use this method to verify that copper alloys meet industry and safety standards concerning lead content.

Research and Development Metallurgical research labs utilize ISO 4749 to analyze and optimize alloy compositions where lead influences mechanical or physical properties.

Environmental and Safety Testing Determination of lead impurity levels is essential where lead exposure poses risks; this standard supports accurate assessment for workplace or consumer safety.

Related Standards

ISO 1811 – Sampling of copper alloys, which complements ISO 4749 by specifying procedures to obtain representative samples for testing.

ISO 11969 – Copper and copper alloys - Chemical analysis methods for impurities other than lead using atomic absorption spectrometry.

ISO 17025 – General requirements for the competence of testing and calibration laboratories, ensuring laboratories performing ISO 4749 comply with international quality management requirements.

Adherence to ISO 4749:1984 ensures precise determination of lead content in copper alloys, essential for quality assurance, regulatory compliance, and metallurgical research. Its established methodology for flame atomic absorption spectrometry provides a globally accepted analytical tool for the copper industry.

ISO 4749:1984 PDF

Abstract

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Overview

Key Topics

Applications

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