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Significance and Use
4.1 This document provides guidance for the implementation of procedures for the preparation, testing, and documentation of an in-house reference material (hereafter called an iRM) to be used for a number of purposes, enumerated in the following document, associated with development, validation, and control of chemical and physical measurement processes.
4.2 This guide is primarily concerned with characterization of the chemical compositions of metals, ores, and related materials. For all these materials, there is a continuing, strong demand for reference materials (RMs) that is difficult for metrology institutes and private certified reference material (CRM) developers to meet because CRM development requires substantial investments of time and money. The metals and mining industries consume RMs and create new product and by-product compositions at high rates. They use analytical methods that provide rapid and accurate determinations, and both quality assurance and quality control can be maintained using efficient procedures provided appropriate iRMs are available.
4.3 The user of this guide must recognize that development of an iRM for any purpose carries with it the responsibility to design and execute the development process correctly, and to document the process thoroughly. In addition, the user of an iRM bears the responsibility for correct use of the iRM material within its design limitations.
4.4 This guide contains discussions on material selection and sampling for RMs with some attention given to conversion to the final forms.
4.5 The use of iRMs is appropriate for control chart procedures to demonstrate that chemical measurement processes are under statistical control. This function requires demonstration of sufficient homogeneity of a material, but it does not require assignment of chemical and physical property values with associated, exhaustively evaluated uncertainties.
4.6 The use of iRMs is appropriate for calibration of test methods and evaluation of calibrations in several ways, including checking for bias, systematic testing of corrections for matrix effects, and testing of sample preparation procedures. See Section . This guide provides explanations of general cases in which an iRM can be used as part of a validation process (see Guide ).
4.7 Because this document is a standard guide, it is intended to educate those who are involved in laboratory operation, quality system development and maintenance, and accreditation of laboratory operations within the scope of a quality system. However, this guide does not constitute requirements for assessment and accreditation.
1.1 This document provides guidance for the implementation of procedures for preparation of in-house reference materials for analytical testing of metals, ores, slags, and other materials encountered within the metals and mining industries.
1.2 This guide is applicable to the production of reference materials only (usually for internal use) and does not apply to the production of certified reference materials (CRMs). Materials may include metals, alloys, minerals, geological materials, manufacturing intermediates, and byproducts. Samples may be in a number of physical forms including blocks, disks, rods, wires, chips, granules, powders, and liquids.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E32 Practices for Sampling Ferroalloys and Steel Additives for Determination of Chemical Composition
E34 Test Methods for Chemical Analysis of Aluminum and Aluminum-Base Alloys
E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
E55 Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical Composition
E88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition
E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
E178 Practice for Dealing With Outlying Observations
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition
E415 Test Method for Analysis of Carbon and Low-Alloy Steel by Spark Atomic Emission Spectrometry
E716 Practices for Sampling and Sample Preparation of Aluminum and Aluminum Alloys for Determination of Chemical Composition by Spectrochemical Analysis
E826 Practice for Testing Homogeneity of a Metal Lot or Batch in Solid Form by Spark Atomic Emission Spectrometry
E877 Practice for Sampling and Sample Preparation of Iron Ores and Related Materials for Determination of Chemical Composition and Physical Properties
E1086 Test Method for Analysis of Austenitic Stainless Steel by Spark Atomic Emission Spectrometry
E1329 Practice for Verification and Use of Control Charts in Spectrochemical Analysis
E1806 Practice for Sampling Steel and Iron for Determination of Chemical Composition
E2857 Guide for Validating Analytical Methods
ISO StandardsISO Guide 30/Amd. 1 Revision of definitions for reference material and certified reference material ISO Guide 30 Terms and Definitions Used in Connection with Reference Materials ISO Guide 35 Reference materials--General and statistical principles for certification ISO Guide 98-3 Guide to the Expression of Uncertainty in Measurement (GUM: 1995) ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories
ICS Number Code 77.140.01 (Iron and steel products in general)
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ASTM E2972-15, Standard Guide for Production, Testing, and Value Assignment of In-House Reference Materials for Metals, Ores, and Other Related Materials, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top