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//ISO 5068-2:2007

ISO 5068-2:2007

Name: ISO 5068-2:2007 — Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric method for moisture in the analysis sample
SKU: ISO 5068-2:2007
Price: 25 EUR
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Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric method for moisture in the analysis sample

Название (английский):

ISO 5068-2:2007

Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric method for moisture in the analysis sample

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 10 января 2007 г.
Издание:: ISO IS 5068 edition 1 version 1
ICS:: 73.040

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Цена:25 €

Описание (английский):

ISO 5068-2:2007 specifies a method for the determination of the moisture content in the analysis sample of brown coals and lignites using an indirect gravimetric method.

Abstract

Overview

ISO 5068-2:2007 specifies an indirect gravimetric method for determining the moisture content of the analysis sample of brown coals and lignites. The method measures mass loss of a weighed test portion dried under controlled conditions (105 °C to 110 °C) in a nitrogen atmosphere and is intended for routine laboratory moisture analysis of hygroscopic brown coal and lignite samples.

Key topics and technical requirements

Principle: Moisture is calculated from the loss in mass of an analysis sample dried to constant mass in a nitrogen‑purged oven.
Temperature and atmosphere: Oven control between 105 °C and 110 °C with a dry, high‑purity nitrogen atmosphere (oxygen ≤ 30 µl/l).
Nitrogen flow: Recommended flow to provide approximately 15 oven‑volume changes per hour; Annex A describes a nitrogen purification train (reduced copper at ≈ 500 °C) or the use of commercial nitrogen meeting the oxygen limit.
Sample and sample prep: Analysis sample prepared per ISO 5069-2; typically ground to pass a 0.212 mm sieve. Test portion: 1–2 g spread so layer mass does not exceed specified limits.
Apparatus: Sensitive balance (0.001 g resolution), shallow silica/glass weighing dish with well‑fitting lid, flow meter, drying tower with desiccant and a cooling vessel/desiccator.
Reagents and safety: Desiccants such as magnesium perchlorate or silica gel are recommended; note hazard warning for magnesium perchlorate (strong oxidizer).
Procedure and timing: Weigh before and after drying; dry for 3 h or until constant mass. Cool covered dish on a metal plate (≤ 5 min), then to room temperature (≈ 20 min) before final weighing.
Expression and precision: Moisture (%) calculated from mass differences; report mean of duplicate determinations to 0.1%. Repeatability: duplicate results in same lab/operator should not differ by more than 0.3%.
Reporting: Include sample identification, standard reference, result and expression method, and test date.

Applications and users

ISO 5068-2 is used where accurate moisture determination of brown coal and lignite analysis samples is required:

Analytical laboratories performing proximate and ultimate coal analyses (moisture, volatile matter, calorific value, C/H).
Power generation and coal handling facilities for quality control and fuel accounting.
Coal producers and trading operations needing standardized moisture reporting.
Research laboratories and regulatory bodies assessing fuel properties.

Keywords: brown coal moisture determination, lignite moisture analysis, ISO 5068-2, indirect gravimetric method, nitrogen oven, coal testing laboratories.

Related standards

ISO 5068-1 - Indirect gravimetric method for total moisture (companion part).
ISO 5069-2 - Sample preparation for moisture determination and general analysis.
ISO 1213-2 - Vocabulary for sampling, testing and analysis (definitions).

Технические детали

Технический комитет: ISO/TC 27/SC 5 - Methods of analysis
SKU: ISO 5068-2:2007

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