Overview

ISO 10540-3:2002 specifies a laboratory method for the determination of phosphorus content in animal and vegetable fats and oils using inductively coupled plasma optical emission spectroscopy (ICP-OES). The procedure is designed for oils with low phosphorus content that are clear (no turbidity or visible sediment) and where phosphorus is present in a solubilized form. The method supports most vegetable oil types (crude, degummed, refined, bleached, deodorized, hardened) and nearly all lecithins and phosphatides depending on dilution solvent.

Key topics and technical requirements

Analytical technique: ICP-OES (direct aspiration of solvent-diluted oils). Phosphorus emission lines commonly used: 178.2 nm, 213.6 nm, 214.9 nm. Typical LOD ≈ 0.5 mg/kg.
Sample preparation: Dilute samples, standards and blanks 1:1 by mass with solvent (preferred 1‑butanol, or kerosene/xylene). Solid/hardened fats are melted (~10 °C above melting point) and kept ≤ 60 °C during analysis.
Test aliquot: Example procedure-weigh 2.50 g sample and add 2.50 g solvent; invert/mix and analyze. Lecithins require specific dilute-and-mix steps (see standard).
Standards and calibration: Prepare organic-soluble phosphorus standards in blank oil; recommended calibration range 0–25 mg/kg with typical standards at 2.5, 5.0, 10.0 mg/kg. Scan blanks, samples and standards in triplicate; restandardize every ~10 samples.
Instrument considerations: Follow manufacturer specs; adjust pump flow and nebulizer settings for chosen solvent. Monitor for calibration drift (carbon build-up on injector can affect results).
Limitations: Not suitable when phosphorus is present as fine particles (e.g., bleaching earth). For particulate phosphorus, ISO 10540-2 (graphite furnace AAS) is the appropriate non-ashing direct method.
Precision: Precision and reproducibility were established by interlaboratory studies (see Annex A). Repeatability and reproducibility limits are provided for tested concentration ranges.

Applications and users

Who uses ISO 10540-3:2002:

Quality control and analytical laboratories in edible oil, oilseed and lecithin production
Food manufacturers and ingredient suppliers verifying phosphorus specifications
Regulatory and compliance labs testing product release and labeling
R&D and method validation teams evaluating degumming and refining efficiency

Practical uses:

Monitoring degumming/phosphatide removal during oil refining
Verifying low-phosphorus specifications for refined oils and lecithins
Routine QC testing for edible oils and industrial fat streams

Related standards

ISO 10540-1 - Colorimetric method for phosphorus
ISO 10540-2 - Graphite furnace atomic absorption spectrometry (GFAAS) for particulate phosphorus
ISO 661 - Preparation of test sample
ISO 5555 - Sampling of fats and oils
ISO 5725 - Method precision (repeatability and reproducibility)

Keywords: ISO 10540-3:2002, phosphorus determination, ICP-OES, animal and vegetable fats and oils, 1-butanol dilution, lecithins, low phosphorus analysis.

Overview

Key topics and technical requirements

Analytical technique: ICP-OES (direct aspiration of solvent-diluted oils). Phosphorus emission lines commonly used: 178.2 nm, 213.6 nm, 214.9 nm. Typical LOD ≈ 0.5 mg/kg.
Sample preparation: Dilute samples, standards and blanks 1:1 by mass with solvent (preferred 1‑butanol, or kerosene/xylene). Solid/hardened fats are melted (~10 °C above melting point) and kept ≤ 60 °C during analysis.
Test aliquot: Example procedure-weigh 2.50 g sample and add 2.50 g solvent; invert/mix and analyze. Lecithins require specific dilute-and-mix steps (see standard).
Standards and calibration: Prepare organic-soluble phosphorus standards in blank oil; recommended calibration range 0–25 mg/kg with typical standards at 2.5, 5.0, 10.0 mg/kg. Scan blanks, samples and standards in triplicate; restandardize every ~10 samples.
Instrument considerations: Follow manufacturer specs; adjust pump flow and nebulizer settings for chosen solvent. Monitor for calibration drift (carbon build-up on injector can affect results).
Limitations: Not suitable when phosphorus is present as fine particles (e.g., bleaching earth). For particulate phosphorus, ISO 10540-2 (graphite furnace AAS) is the appropriate non-ashing direct method.
Precision: Precision and reproducibility were established by interlaboratory studies (see Annex A). Repeatability and reproducibility limits are provided for tested concentration ranges.

Applications and users

Who uses ISO 10540-3:2002:

Quality control and analytical laboratories in edible oil, oilseed and lecithin production
Food manufacturers and ingredient suppliers verifying phosphorus specifications
Regulatory and compliance labs testing product release and labeling
R&D and method validation teams evaluating degumming and refining efficiency

Practical uses:

Monitoring degumming/phosphatide removal during oil refining
Verifying low-phosphorus specifications for refined oils and lecithins
Routine QC testing for edible oils and industrial fat streams

Related standards

ISO 10540-1 - Colorimetric method for phosphorus
ISO 10540-2 - Graphite furnace atomic absorption spectrometry (GFAAS) for particulate phosphorus
ISO 661 - Preparation of test sample
ISO 5555 - Sampling of fats and oils
ISO 5725 - Method precision (repeatability and reproducibility)

Keywords: ISO 10540-3:2002, phosphorus determination, ICP-OES, animal and vegetable fats and oils, 1-butanol dilution, lecithins, low phosphorus analysis.

ISO 10540-3:2002 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

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