ISO 20846:2019
Petroleum products — Determination of sulfur content of automotive fuels — Ultraviolet fluorescence method
Petroleum products — Determination of sulfur content of automotive fuels — Ultraviolet fluorescence method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 13
- Дата публикации:
- 8 августа 2019 г.
- Издание:
- ISO IS 20846 edition 3 version 1
- ICS:
- 75.160.20
This document specifies an ultraviolet (UV) fluorescence test method for the determination of the sulfur content of the following products: — having sulfur contents in the range 3 mg/kg to 500 mg/kg, — motor gasolines containing up to 3,7 % (m/m) oxygen [including those blended with ethanol up to about 10 % (V/V)], — diesel fuels, including those containing up to about 30 % (V/V) fatty acid methyl ester (FAME), — having sulfur contents in the range of 3 mg/kg to 45 mg/kg, — synthetic fuels, such as hydrotreated vegetable oil (HVO) and gas to liquid (GTL). Other products can be analysed and other sulfur contents can be determined according to this test method, however, no precision data for products other than automotive fuels and for results outside the specified range have been established for this document. Halogens interfere with this detection technique at concentrations above approximately 3 500 mg/kg. NOTE 1 Some process catalysts used in petroleum and chemical refining can be poisoned when trace amounts of sulfur-bearing materials are contained in the feedstocks. NOTE 2 This test method can be used to determine sulfur in process feeds and can also be used to control sulfur in effluents. NOTE 3 For the purposes of this document, "% (m/m)" and "% (V/V)" are used to represent the mass fraction, w, and the volume fraction, φ, of a material respectively. NOTE 4 Sulfate species in ethanol do not have the same conversion factor of organic sulfur in ethanol. Nevertheless, sulfates have a conversion factor close to that of organic sulfur. NOTE 5 Nitrogen interference can occur, see 6.5 for further guidance.
Abstract
Overview
ISO 20846:2019 - "Petroleum products - Determination of sulfur content of automotive fuels - Ultraviolet fluorescence method" specifies a UV fluorescence test method for measuring sulfur in automotive fuels. The method covers motor gasolines (including ethanol blends), diesel fuels (including up to ~30% FAME), and synthetic fuels such as HVO and GTL. Typical measurement ranges covered are 3 mg/kg to 500 mg/kg (general) and 3 mg/kg to 45 mg/kg for certain diesel analyses. The standard describes equipment, reagents, calibration, procedure, calculation and reporting requirements for reliable sulfur determination by ultraviolet fluorescence.
Key topics and requirements
- Principle: Combustion of hydrocarbon sample at high temperature (1 000 °C–1 100 °C) to convert sulfur to SO2, removal of water vapour, UV excitation and fluorescence detection of SO2 by a photomultiplier.
- Scope limits & interferences:
- Validated for automotive fuels within stated concentration ranges; precision data are limited to these products and ranges.
- Halogen interference above ~3 500 mg/kg can affect results.
- Nitrogen-containing species can interfere (manufacturers' guidance and Section 6.5 apply).
- Note on sulfates in ethanol and conversion factors differing from organic sulfur.
- Reagents & materials: high-purity inert gas (argon/helium ≥99.998%), oxygen (≥99.75%), solvents (toluene or isooctane recommended), certified sulfur compounds or CRMs for calibration.
- Apparatus: furnace, quartz combustion tube, flow controllers, vapour drier, UV fluorescence detector, microlitre syringe (5–50 µl) and sample inlet systems.
- Calibration & QC: multi-point and one-point calibration procedures, preparation of ~1 000 mg/l sulfur stock and diluted standards, quality control samples and routine verification.
- Procedure & reporting: detailed sampling, apparatus preparation, calibration, calculation and expression of results; precision (repeatability and reproducibility) addressed for the validated scope.
- Safety: warnings on oxygen use, UV exposure and handling flammable solvents.
Applications and who uses it
- Laboratories performing regulatory or quality-control sulfur analysis of automotive gasoline, diesel, HVO, GTL and related blends.
- Refineries and fuel producers for feedstock control, catalyst protection and effluent monitoring.
- Independent testing labs and compliance bodies verifying fuel specifications and emissions-related limits.
- Instrument manufacturers and method developers implementing UV fluorescence sulfur analyzers.
Keywords: ISO 20846:2019, ultraviolet fluorescence, sulfur content, automotive fuels, sulfur determination, diesel, gasoline, HVO, GTL, FAME, calibration, sulfur analysis.
Related standards
Normative references cited include ISO 1042 (volumetric flasks), ISO 3170 / 3171 (sampling), ISO 3675 and ISO 12185 (density determination).
Технические детали
- Технический комитет
- ISO/TC 28 - Petroleum and related products, fuels and lubricants from natural or synthetic sources
- SKU
- ISO 20846:2019
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