ISO 7704:2023
Water quality — Requirements for the performance testing of membrane filters used for direct enumeration of microorganisms by culture methods
This document specifies the requirements for the performance testing of membrane filters used for the retention followed by direct enumeration of microorganisms by culture methods.
This document is applicable to membrane filters which are used for retention followed by direct enumeration of specific microorganisms on solid media or on other devices containing media, like absorbent pads[19].
This document is not applicable for membrane filters used for concentration and elution or for qualitative methods.
These tests are applicable to the membrane filters intended for the microbiological analysis of different types of water, such as:
— drinking water, bottled water and other types of water with expected low numbers of microorganisms;
— water with expected higher numbers of microorganisms, for example, surface water and process water.
These tests are intended to demonstrate the suitability of the whole system (membrane filter together with the culture medium including the filtration step) required for the specific tests described in References [3], [6], [8], [10], [12] and [13].
This document applies to:
— manufacturers producing membrane filters;
| Get this standard | Prices exclude GST | |
|---|---|---|
| PDF ( Single user document) |
$343.00 NZD
|
|
| HardCopy |
$389.00 NZD
|
|
| Networkable PDF |
Price varies
|
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 General terminology
3.2 Terminology of performance testing
3.3 Terminology for test microorganisms
4 Principle
4.1 General
4.1.1 Introduction
4.1.2 Batch testing
4.1.3 Supplementary testing
4.2 Performance testing
4.2.1 Modules for batch and supplementary testing
4.2.2 Absence of microbial contamination
5 Apparatus and glassware
6 Culture media and diluents
7 Preparation of microorganisms for performance testing
7.1 General
7.2 Reference count
7.2.1 Quantitative productivity testing
7.2.2 Qualitative selectivity testing
7.2.3 Qualitative specificity testing
7.3 Preparation of a standardized test suspension using a working culture
7.3.1 General
7.3.2 Preparation of the working culture
7.3.3 Preparation of a standardized test suspension (inoculum) for the test
7.4 Preparation of a test suspension using reference material
8 Sampling of membrane filters for testing
9 Procedure
9.1 General
9.2 Inoculation by spread plate technique
9.2.1 General
9.2.2 Inoculation
9.3 Inoculation by membrane filtration technique
9.3.1 General
9.3.2 Inoculation
9.4 Incubation and counting
9.5 Test for absence of microbial contamination
10 Calculation, expression and interpretation of results
10.1 General
10.2 Productivity testing
10.3 Selectivity testing
10.4 Specificity testing
11 Documentation of test results
11.1 Test report
11.2 Information provided by the manufacturer
11.3 Traceability
Annex A (normative) Diagram of the procedure for batch testing
Annex B (informative) Example of a card for recording test results from batch testing
Annex C (informative) Quantitative supplementary testing of membrane filters
Annex D (informative) Qualitative supplementary testing of membrane filters
Annex E (informative) Practical example of quantitative batch testing and quantitative supplementary testing by the end user
Bibliography
Previous versions
Keep me up-to-date
Sign up to receive updates when there are changes to this standard
Related Information
Similar Standards
-
AS/NZS 2031:2001
Selection of containers and preservation of water samples for microbiological analysis
-
AS/NZS 3666.1:2011
Air-handling and water systems of buildings - Microbial control - Part 1: Design, installation and commissioning -
AS/NZS 3666.2:2011
Air-handling and water systems of buildings - Microbial control - Part 2: Operation and maintenance
-
AS/NZS 3666.3:2011
Air-handling and water systems of buildings - Microbial control - Part 3: Performance-based maintenance of cooling water systems
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 General terminology
3.2 Terminology of performance testing
3.3 Terminology for test microorganisms
4 Principle
4.1 General
4.1.1 Introduction
4.1.2 Batch testing
4.1.3 Supplementary testing
4.2 Performance testing
4.2.1 Modules for batch and supplementary testing
4.2.2 Absence of microbial contamination
5 Apparatus and glassware
6 Culture media and diluents
7 Preparation of microorganisms for performance testing
7.1 General
7.2 Reference count
7.2.1 Quantitative productivity testing
7.2.2 Qualitative selectivity testing
7.2.3 Qualitative specificity testing
7.3 Preparation of a standardized test suspension using a working culture
7.3.1 General
7.3.2 Preparation of the working culture
7.3.3 Preparation of a standardized test suspension (inoculum) for the test
7.4 Preparation of a test suspension using reference material
8 Sampling of membrane filters for testing
9 Procedure
9.1 General
9.2 Inoculation by spread plate technique
9.2.1 General
9.2.2 Inoculation
9.3 Inoculation by membrane filtration technique
9.3.1 General
9.3.2 Inoculation
9.4 Incubation and counting
9.5 Test for absence of microbial contamination
10 Calculation, expression and interpretation of results
10.1 General
10.2 Productivity testing
10.3 Selectivity testing
10.4 Specificity testing
11 Documentation of test results
11.1 Test report
11.2 Information provided by the manufacturer
11.3 Traceability
Annex A (normative) Diagram of the procedure for batch testing
Annex B (informative) Example of a card for recording test results from batch testing
Annex C (informative) Quantitative supplementary testing of membrane filters
Annex D (informative) Qualitative supplementary testing of membrane filters
Annex E (informative) Practical example of quantitative batch testing and quantitative supplementary testing by the end user
Bibliography