ISO 5068-1:2025 PDF

Brown coals and lignites — Determination of moisture — Part 1: Indirect gravimetric method for total moisture

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Title (English):

ISO 5068-1:2025

Brown coals and lignites — Determination of moisture — Part 1: Indirect gravimetric method for total moisture

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: May 2, 2025
Edition:: ISO IS 5068 edition 2 version 1
ICS:: 73.040

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Description (English):

This document specifies two methods for determination of the total moisture of brown coals and lignites using an indirect gravimetric single-stage method and a two-stage method.

Technical details

Technical committee: ISO/TC 27/SC 5 - Methods of analysis
SKU: ISO 5068-1:2025

Abstract

Overview

ISO 5068-1:2025 - "Brown coals and lignites - Determination of moisture - Part 1: Indirect gravimetric method for total moisture" specifies laboratory procedures to measure the total moisture of brown coals and lignites. The document defines two indirect gravimetric procedures: a single-stage nitrogen‑flushed drying method and a two-stage method (air‑dry stage followed by nitrogen drying). This second edition updates terms, references and the test report and replaces ISO 5068-1:2007.

Key Topics and technical requirements

Methods covered:
- Single-stage method: finely prepared sample dried to constant mass at 105 °C to 110 °C in a nitrogen atmosphere.
- Two-stage method: coarse sample air‑dried (ambient or 30–40 °C), then crushed and dried at 105–110 °C under nitrogen to determine residual moisture; total moisture is the sum of both losses.
Atmosphere & gases: use high‑purity dry nitrogen with maximum oxygen ≤ 30 µl/l; nitrogen flow through the oven ≈ 15 oven volumes per hour.
Apparatus & materials: nitrogen‑flushed oven, drying cabinet (30–40 °C), non‑corrodible trays/dishes, balances sensitive to 0.01 g and 0.001 g, and drying tower packed with magnesium perchlorate or silica gel (magnesium perchlorate is a strong oxidizer - safety warning included).
Sample preparation & sizes: single‑stage sample crushed to pass 3.15 mm sieve and divided to 500 g; two‑stage coarse crush to pass 20 mm and divided to 2 kg (or as specified by particle-size rules).
End‑point criteria: constant mass defined by successive mass changes

Related standards

Mentioned in the description and other ISO standards

Overview

Key Topics and technical requirements

Methods covered:
- Single-stage method: finely prepared sample dried to constant mass at 105 °C to 110 °C in a nitrogen atmosphere.
- Two-stage method: coarse sample air‑dried (ambient or 30–40 °C), then crushed and dried at 105–110 °C under nitrogen to determine residual moisture; total moisture is the sum of both losses.
Atmosphere & gases: use high‑purity dry nitrogen with maximum oxygen ≤ 30 µl/l; nitrogen flow through the oven ≈ 15 oven volumes per hour.
Apparatus & materials: nitrogen‑flushed oven, drying cabinet (30–40 °C), non‑corrodible trays/dishes, balances sensitive to 0.01 g and 0.001 g, and drying tower packed with magnesium perchlorate or silica gel (magnesium perchlorate is a strong oxidizer - safety warning included).
Sample preparation & sizes: single‑stage sample crushed to pass 3.15 mm sieve and divided to 500 g; two‑stage coarse crush to pass 20 mm and divided to 2 kg (or as specified by particle-size rules).
End‑point criteria: constant mass defined by successive mass changes

ISO 5068-1:2025 PDF

Technical details

Abstract

Overview

Key Topics and technical requirements

Related standards

Abstract

Overview

Key Topics and technical requirements

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