ISO 6729:2024 PDF

Petroleum products and other liquids — Standard test method for ethanol determination in gasoline blends by gas chromatography

Название (английский):

ISO 6729:2024

Petroleum products and other liquids — Standard test method for ethanol determination in gasoline blends by gas chromatography

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 10 сентября 2024 г.
Издание:: ISO IS 6729 edition 1 version 1
ICS:: 75.160.40

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Описание (английский):

This document establishes a method for determining the ethanol content in gasoline blends by gas chromatography (GC). This method is applicable to gasoline samples with ethanol contents ranging from 1,02 % to 52,3 %, in volume fraction.

Технические детали

Технический комитет: ISO/TC 28/SC 7 - Liquid Biofuels
SKU: ISO 6729:2024

Abstract

Overview

ISO 6729:2024 - "Petroleum products and other liquids - Standard test method for ethanol determination in gasoline blends by gas chromatography" specifies a validated laboratory procedure to quantify ethanol in gasoline blends using gas chromatography (GC) with a flame ionization detector (FID). The method covers gasoline samples with ethanol content from 1.02% to 52.3% by volume and defines operating conditions, calibration, precision and reporting rules for reliable ethanol determination.

Key topics and technical requirements

Analytical principle: Gas chromatography with FID, split/splitless injector, non‑polar fused‑silica capillary column (100% dimethylpolysiloxane).
Applicability: Ethanol content range 1.02%–52.3% (v/v); single‑result reporting limits 0.53%–60.0% (v/v).
Typical instrument settings: detector ~300 °C, injector ~250 °C, split ~300:1, injection 1.0 µL, analysis time ~26.75 min (document lists the recommended oven program and flows).
Reagents and gases: Ethanol ≥99.8% purity; n‑heptane or isooctane (≥99.5%) as solvent; hydrogen or helium carrier gas (GC quality).
Calibration: External standard method using multi‑point calibration (example levels: 15, 25, 30, 40, 55 % v/v). For low‑ethanol samples prepare additional standards that bracket the target. Calibration must achieve R² ≥ 0.995.
Precision: Repeatability and reproducibility expressed by statistical formulas (document provides r = 0.1014·x^0.7 and R = 0.4065·x^0.7, where x is the average ethanol content). Interlaboratory data from 11 labs are included.
Results expression: Report with two decimal places for

Overview

Key topics and technical requirements

Analytical principle: Gas chromatography with FID, split/splitless injector, non‑polar fused‑silica capillary column (100% dimethylpolysiloxane).
Applicability: Ethanol content range 1.02%–52.3% (v/v); single‑result reporting limits 0.53%–60.0% (v/v).
Typical instrument settings: detector ~300 °C, injector ~250 °C, split ~300:1, injection 1.0 µL, analysis time ~26.75 min (document lists the recommended oven program and flows).
Reagents and gases: Ethanol ≥99.8% purity; n‑heptane or isooctane (≥99.5%) as solvent; hydrogen or helium carrier gas (GC quality).
Calibration: External standard method using multi‑point calibration (example levels: 15, 25, 30, 40, 55 % v/v). For low‑ethanol samples prepare additional standards that bracket the target. Calibration must achieve R² ≥ 0.995.
Precision: Repeatability and reproducibility expressed by statistical formulas (document provides r = 0.1014·x^0.7 and R = 0.4065·x^0.7, where x is the average ethanol content). Interlaboratory data from 11 labs are included.
Results expression: Report with two decimal places for

ISO 6729:2024 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

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Abstract

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