SIST ISO 14189:2014 PDF

Name: SIST ISO 14189:2014 — Water quality - Enumeration of Clostridium perfringens - Method using membrane filtration
SKU: SIST ISO 14189:2014
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Water quality - Enumeration of Clostridium perfringens - Method using membrane filtration

Название (английский):

SIST ISO 14189:2014

Water quality - Enumeration of Clostridium perfringens - Method using membrane filtration

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 17
Дата публикации:: 24 февраля 2014 г.
ICS:: 07.100.20
Технический комитет:: KAV - Water quality

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Описание (английский):

ISO 14189:2013 specifies a method for the enumeration of vegetative cells and spores of Clostridium perfringens by the membrane filtration method in samples of water intended for human consumption. However, the method can be applied to all types of water samples provided they do not contain particulate or colloidal matter that interferes with filtration.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 14189:2013 specifies a standardized, culture-based membrane filtration method for the enumeration of vegetative cells and spores of Clostridium perfringens in water - primarily for water intended for human consumption but applicable to other water types that do not interfere with filtration. The standard defines the principle, apparatus, media, sample handling, incubation conditions and confirmatory testing required to produce reliable colony counts expressed per unit volume.

Key Topics and Requirements

Scope: Enumeration of C. perfringens (vegetative cells and spores) by membrane filtration; applicable where particulate/colloidal matter does not prevent filtration.

Principle: Filter a known volume through a 0.45 µm membrane, incubate on tryptose‑sulfite‑cycloserine (TSC) agar anaerobically and count characteristic colonies; heat pre‑treatment isolates spores when required.

Sampling & transport: Follow ISO 19458. Cool samples (ideally 5 ± 3 °C). Recommended maximum storage including transport: 12 h for vegetative bacteria and 24 h for spores; absolute maxima: 18 h (vegetative) and 72 h (spores).

Heat pre‑treatment: To enumerate spores only, heat sample to 60 ± 2 °C for 15 ± 1 min (monitor temperature using a reference bottle).

Filtration & plating: Filter appropriate volumes (100 ml usual for drinking water). Aim for 10–80 colonies on 47–50 mm membranes. Optionally apply a molten TSC overlay to enhance colony blackening.

Incubation: Anaerobic atmosphere (~90% H2 / 10% CO2) at 44 ± 1 °C for 21 ± 3 h. Count presumptive colonies (black/grey to yellow‑brown) and perform confirmations.

Confirmation: Subculture selected colonies onto blood or nutrient agar and perform the acid phosphatase test (purplish colour within ~3–4 min = positive).

Quality factors: Sterile funnels/filters, validated membrane quality, timely incubation and counting (plates should be read within 30 minutes after incubation as blackening fades).

Applications

Routine monitoring of drinking water quality and water resources to detect faecal contamination.

Assessment and verification of water treatment performance and disinfection efficacy.

Environmental surveillance where spores indicate remote or intermittent faecal pollution (spores persist longer than vegetative indicators).

Support for regulatory compliance, public health investigations and research into microbial water quality.

Related Standards

ISO 8199 - General guidance on enumeration of micro‑organisms by culture

ISO 19458 - Water sampling for microbiological analysis

ISO/TS 11133-1 - Preparation and quality assurance of culture media

Keywords: ISO 14189:2013, Clostridium perfringens, water quality, membrane filtration, TSC agar, enumeration, spores, drinking water monitoring, acid phosphatase, anaerobic incubation.

SIST ISO 14189:2014 PDF

Abstract

Похожие стандарты

Overview

Key Topics and Requirements

Applications

Who Uses This Standard

Related Standards

Технические детали

ISO 14189:2013

Water quality — Enumeration of Clostridium perfringens — Method using membrane filtration

SIST EN ISO 19458:2007

Water quality - Sampling for microbiological analysis (ISO 19458:2006)

SIST EN ISO 8199:2019

Water quality - General requirements and guidance for microbiological examinations by culture (ISO 8199:2018)

ISO/TS 11133-1:2009

Microbiology of food and animal feeding stuffs — Guidelines on preparation and production of culture media —…