ASTM G220-20
Standard Practice for Replacing Saturated Calomel Reference Electrode (SCE) for Measuring Electrode Potentials

Standard No.

ASTM G220-20

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM G220-20

Scope

1.1 This practice provides the steps necessary to prepare revisions to standards that specify the saturated calomel reference electrode (SCE) for measuring or controlling electrode potentials. 1.2 The SCE contains mercury and, as a result, it may not be available in locations where mercury has been banned. This practice covers the selection and use of an alternative reference electrode. 1.3 In test methods where the SCE is specified, it will be necessary to develop a new precision statement using the alternative reference electrode. 1.4 This practice will not apply to electrometric pH determinations where the SCE has been used. (Electrometric pH measurement is an analytical method that is covered elsewhere.) 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercurycontaining products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 1.7 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM G220-20 Referenced Document

• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• ASTM G193 Standard Terminology and Acronyms Relating to Corrosion*， 2022-08-01 Update
• ASTM G215 Standard Guide for Electrode Potential Measurement
• ASTM G3 Standard Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing

ASTM G220-20 history

• 2020 ASTM G220-20 Standard Practice for Replacing Saturated Calomel Reference Electrode (SCE) for Measuring Electrode Potentials