ISO 11423-1:1997 PDF

Water quality — Determination of benzene and some derivatives — Part 1: Head-space gas chromatographic method

Название (английский):

ISO 11423-1:1997

Water quality — Determination of benzene and some derivatives — Part 1: Head-space gas chromatographic method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 17
Дата публикации:: 5 июня 1997 г.
Издание:: ISO IS 11423 edition 1 version 1
ICS:: 13.060.50

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Описание (английский):

La méthode décrite est applicable à la détermination du benzène, du méthylbenzène (toluène), des diméthylbenzènes (xylènes) et de l'éthylbenzène (dans la suite l'abréviation BTX est utilisée) dans des échantillons homogènes d'eau et d'eau résiduaire à des concentrations supérieures à 2 µg/l. Dans des échantillons organiquement pollués, la limite de détermination peut, suivant la matrice de l'échantillon, être supérieure. Des concentrations élevées peuvent être déterminées en diluant l'échantillon. D'autres dérivés et composés apolaires présentant des propriétés physiques similaires peuvent également être déterminés par cette méthode. Il convient alors de vérifier l'applicabilité de la méthode à l'échantillon d'eau donné.

Технические детали

Технический комитет: ISO/TC 147/SC 2 - Physical, chemical and biochemical methods
SKU: ISO 11423-1:1997

Abstract

Overview

ISO 11423-1:1997 defines a head-space gas chromatographic (HS-GC) method for the determination of benzene and some benzene derivatives in water. The method targets benzene, methylbenzene (toluene), dimethylbenzenes (xylenes) and ethylbenzene (commonly referred to as BTX) and may be applicable to other non‑polar compounds with similar properties. It is intended for homogeneous water and wastewater samples with concentrations above 2 µg/L (higher limits may apply for organically polluted matrices).

Key topics and requirements

Method principle: Heat a defined volume of unfiltered water in a sealed vial to establish equilibrium between liquid and head-space gas, then transfer an aliquot of the gaseous phase to a gas chromatograph.
Analytes: Benzene, toluene, ethylbenzene, o‑/m‑/p‑xylene (BTX); applicability to further derivatives must be verified for each sample.
Sampling and sample prep:
- Use non‑actinic glass containers or head-space vials; avoid plastics to prevent sorption/desorption.
- For increased gas-phase partitioning, add potassium carbonate (example: ~7–8 g per 5 mL sample in vials) to boost ionic strength; neutralize CO2 in gaseous waters similarly.
- Store samples at about 4 °C in the dark and analyse within 2 days when possible.
Head-space conditions: Static equilibrium typically achieved at ≥60 °C for ≥1 hour; the same conditions must be used for samples and blanks.
Chromatography and detection:
- Use at least two capillary columns with different stationary phase polarity (simultaneous injection preferred) to confirm identity.
- FID is the standard detector for quantification; GC‑MS or PID can be used for improved identification when needed.
- Manual injection volumes recommended ≤ 1 µL (hot syringe warmed ~20 °C above head-space temperature).
Quality control:
- Perform reagent and air blanks covering the full analytical path; benzene ubiquity requires careful blank control.
- Blank values normally should be

Overview

Key topics and requirements

Method principle: Heat a defined volume of unfiltered water in a sealed vial to establish equilibrium between liquid and head-space gas, then transfer an aliquot of the gaseous phase to a gas chromatograph.
Analytes: Benzene, toluene, ethylbenzene, o‑/m‑/p‑xylene (BTX); applicability to further derivatives must be verified for each sample.
Sampling and sample prep:
- Use non‑actinic glass containers or head-space vials; avoid plastics to prevent sorption/desorption.
- For increased gas-phase partitioning, add potassium carbonate (example: ~7–8 g per 5 mL sample in vials) to boost ionic strength; neutralize CO2 in gaseous waters similarly.
- Store samples at about 4 °C in the dark and analyse within 2 days when possible.
Head-space conditions: Static equilibrium typically achieved at ≥60 °C for ≥1 hour; the same conditions must be used for samples and blanks.
Chromatography and detection:
- Use at least two capillary columns with different stationary phase polarity (simultaneous injection preferred) to confirm identity.
- FID is the standard detector for quantification; GC‑MS or PID can be used for improved identification when needed.
- Manual injection volumes recommended ≤ 1 µL (hot syringe warmed ~20 °C above head-space temperature).
Quality control:
- Perform reagent and air blanks covering the full analytical path; benzene ubiquity requires careful blank control.
- Blank values normally should be

ISO 11423-1:1997 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

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