ASTM D7847-22
Standard Guide for Interlaboratory Studies for Microbiological Test Methods

Standard No.

ASTM D7847-22

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D7847-22

Scope

1.1 Microbiological test methods present challenges that are unique relative to chemical or physical parameters, because microbes proliferate, die off and continue to be metabolically active in samples after those samples have been drawn from their source. 1.1.1 Microbial activity depends on the presence of available water. Consequently, the detection and quantification of microbial contamination in fuels and lubricants is made more complicated by the general absence of available water from these fluids. 1.1.2 Detectability depends on the physiological state and taxonomic profile of microbes in samples. These two parameters are affected by various factors that are discussed in this guide, and contribute to microbial data variability. 1.2 This guide addresses the unique considerations that must be accounted for in the design and execution of interlaboratory studies intended to determine the precision of microbiological test methods designed to quantify microbial contamination in fuels, lubricants and similar low watercontent (water activity <0.8) fluids. 1 This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee D02.14 on Stability, Cleanliness and Compatibility of Liquid Fuels. Current edition approved July 1, 2022. Published August 2022. Originally approved in 2012. Last previous edition approved in 2017 as D7847 – 17. DOI: 10.1520/D7847-22. 2 Beckers, H. J., “Precision Testing of Standardized Microbiological Methods,” Journal of Testing and Evaluation, JTEVA, Vol. 14, No. 6, November 1986, pp. 318–320. *A Summary of Changes section appears at the end of this standard Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 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. 1 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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 D7847-22 Referenced Document

• ASTM D1129 Standard Terminology Relating to Water
• ASTM D156 Standard Test Method for Saybolt Color of Petroleum Products (Saybolt Chromometer Method)
• ASTM D4012 Standard Test Method for Adenosine Triphosphate (ATP) Content of Microorganisms in Water
• ASTM D4175 Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants*， 2023-07-01 Update
• ASTM D6300 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
• ASTM D6469 Standard Guide for Microbial Contamination in Fuels and Fuel Systems
• ASTM D6974 Standard Practice for Enumeration of Viable Bacteria and Fungi in Liquid Fuels—Filtration and Culture Procedures
• ASTM D7463 Standard Test Method for Adenosine Triphosphate (ATP) Content of Microorganisms in Fuel, Fuel/Water Mixtures, and Fuel Associated Water
• ASTM D7464 Standard Practice for Manual Sampling of Liquid Fuels, Associated Materials and Fuel System Components for Microbiological Testing
• ASTM D7687 Standard Test Method for Measurement of Cellular Adenosine Triphosphate in Fuel and Fuel-associated Water With Sample Concentration by Filtration (Standard + Redline PDF Bundle)*， 2023-04-03 Update
• ASTM D7978 Standard Test Method for Determination of the Viable Aerobic Microbial Content of Fuels and Associated Water—Thixotropic Gel Culture Method
• ASTM D8070 Standard Test Method for Screening of Fuels and Fuel Associated Aqueous Specimens for Microbial Contamination by Lateral Flow Immunoassay*， 2023-07-01 Update
• ASTM E1259 Standard Test Method for Evaluation of Antimicrobials in Liquid Fuels Boiling Below 390176;C
• ASTM E1326 Standard Guide for Evaluating Nonconventional Microbiological Tests Used for Enumerating Bacteria
• ASTM E1601 Standard Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
• ASTM E2756 Standard Terminology Relating to Antimicrobial and Antiviral Agents

ASTM D7847-22 history

• 2022 ASTM D7847-22 Standard Guide for Interlaboratory Studies for Microbiological Test Methods
• 2017 ASTM D7847-17 Standard Guide for Interlaboratory Studies for Microbiological Test Methods
• 2012 ASTM D7847-12e1 Standard Guide for Interlaboratory Studies for Microbiological Test Methods
• 2012 ASTM D7847-12 Standard Guide for Interlaboratory Studies for Microbiological Test Methods