ISO 22892:2006

Name: ISO 22892:2006 — Soil quality — Guidelines for the identification of target compounds by gas chromatography and mass spectrometry
SKU: ISO 22892:2006
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Soil quality — Guidelines for the identification of target compounds by gas chromatography and mass spectrometry

Название (английский):

ISO 22892:2006

Soil quality — Guidelines for the identification of target compounds by gas chromatography and mass spectrometry

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 20
Дата публикации:: 6 февраля 2006 г.
Издание:: ISO IS 22892 edition 1 version 1
ICS:: 13.080.05

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Описание (английский):

ISO 22892:2006 gives criteria for gas chromatography and mass spectrometry (GC-MS) identification of target compounds in soil samples. ISO 22892:2006 is intended for use with standards developed for the determination of specific compounds. The identification criteria are based on the comparison of retention times followed by interpretation of the electron ionization mass spectra, or if necessary, additional mass spectrometric techniques and other relevant factors.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 22892:2006 - "Soil quality - Guidelines for the identification of target compounds by gas chromatography and mass spectrometry" provides harmonized criteria for identifying target compounds in soil (and other environmental) samples using GC‑MS. It is a guidance standard intended to be used alongside specific analytical methods for particular compounds. The standard defines how to combine relative retention time checks with electron ionization mass spectral interpretation (and, where needed, additional MS techniques) to classify a compound as identified, indicated, or absent.

Key topics and technical requirements

Instrument mode and basic settings

Ionization: Electron ionization (EI) (commonly 70 eV).
Scan modes: Full scan and Selected Ion Monitoring (SIM) are allowed.
Mass range: typically from m/z 35 up to the target’s highest mass + 10 u.
Scan rate: recommended ≈10× peak frequency with a minimum of 7 scans per peak.
Mass resolution: tune to nominal resolution with peak width at half-height ≤ 0.7 u.

Retention time criteria

Use a retention time standard (often an internal standard) and calculate relative retention time; value shall be < 2.
Peak maxima of extracted ion chromatograms are used for retention time decisions.
Allowed difference between diagnostic ions’ retention times ≤ 20% of peak width at half-height (commonly ≈1 s).

Diagnostic ions and identification points

Preferably select three diagnostic ions per target compound; intensities measured as peak height or area.
Diagnostic ions must have S/N > 3 to count; lowest concentration for identification requires the weakest diagnostic ion to meet S/N > 3.
Selection guidance: favor high m/z, even-mass fragments, molecular ion where possible, and isotope clusters (e.g., Cl-containing species).
Identification is based on a point system: typically ≥3 identification points for a positive identification; 1–2 points yields an indication; none = absence (below detection limit).
Additional identification points can be obtained from MS‑MS, chemical ionization, HR‑MS, chromatographic pattern, isotope dilution, spike/recovery, or corroborating analytical techniques.

Reporting and qualification

The standard outlines a three‑step qualification process (GC criterion → analytical identification points → contextual/sample knowledge) and reporting categories (identified, indicated, absent).
Annexes provide diagnostic ion tables, examples, and spectra to support implementation.

Practical applications

Use in environmental laboratories for soil contamination screening, forensic investigations, and regulatory compliance testing.

Integration with compound‑specific ISO or national methods to standardize compound identification, reduce false positives, and support defensible results.

Helpful for method development, validation, QA/QC, and reporting of GC‑MS soil analyses.

Related standards

ISO/IEC 17025 (laboratory competence and quality assurance)

Compound‑specific ISO and national standards for soil chemical determinations (used together with ISO 22892)

Keywords: ISO 22892, soil quality, GC‑MS, gas chromatography mass spectrometry, diagnostic ions, retention time, identification points, SIM, electron ionization, environmental analysis.

ISO 22892:2006

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications

Who should use ISO 22892

Related standards

Технические детали

BS EN ISO 22892:2011

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