ISO 1572-1980 PDF

Full title and description

ISO 1572:1980 — Tea — Preparation of ground sample of known dry matter content. This International Standard specifies a method for preparing a ground tea sample and determining its dry matter content so that analytical results can be expressed on a dry-matter basis.

Abstract

The standard describes grinding the tea sample and determining the dry matter (moisture-free) content of the ground sample by heating a test portion in an oven at 103 °C ± 2 °C until constant mass is achieved. The procedure is intended to provide a ground sample of known dry matter content suitable for further compositional or quality analyses.

General information

• Status: Published (International Standard; confirmed in periodic reviews).
• Publication date: August 1980 (1980-08-01).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 67.140.10 (Tea).
• Edition / version: Edition 2 (1980).
• Number of pages: 2 (short technical standard).

Scope

ISO 1572:1980 applies to the preparation of a ground tea sample with a known dry matter content for use in analytical determinations where results need to be expressed relative to dry matter. The method covers sample grinding and determination of dry matter by oven drying to constant mass at 103 °C ± 2 °C. The standard was developed under ISO/TC 34/SC 8 (tea).

Key topics and requirements

• Preparation of a representative ground tea sample suitable for laboratory analysis.
• Determination of dry matter content by oven drying at 103 °C ± 2 °C to constant mass.
• Provision of results expressed on a dry-matter basis to enable consistent reporting of compositional analyses.
• Typical laboratory equipment and conditions (grinder, oven capable of 103 °C ± 2 °C, balance) as implied by the method requirements; users should follow good laboratory practice and local accreditation rules. (Typical practice inferred from the method description.)

Typical use and users

This standard is used by tea testing laboratories, quality control departments in tea production and processing, regulatory and inspection bodies, research institutions working on tea composition and stability, and any laboratory that needs to express analytical results on a dry-matter basis for tea samples.

Related standards

ISO 1572 is part of the body of ISO standards dealing with tea (work of ISO/TC 34/SC 8). Identical or equivalent national/adopted documents reported in reference listings include NFV 03 341:1981 (identical) and other national implementations; it has also been referenced alongside documents such as BS 6049-1 (1981) in some catalogues. Users should consult national standards bodies for adopted versions.

Keywords

tea; dry matter; moisture determination; sample preparation; oven drying; laboratory method; ISO 1572.

FAQ

Q: What is this standard?

A: ISO 1572:1980 is an International Standard that specifies a procedure for preparing a ground tea sample of known dry matter content and for determining that dry matter content so analytical results can be reported on a dry-matter basis.

Q: What does it cover?

A: It covers grinding the tea sample and determining dry matter by oven drying a test portion at 103 °C ± 2 °C to constant mass. The standard provides a concise, controlled method intended to standardize how dry-matter-based results are obtained for tea analyses.

Q: Who typically uses it?

A: Analytical and quality-control laboratories in the tea industry, tea processors, research laboratories, and regulatory inspection bodies use this standard when they need to express compositional or analytical results on a dry-matter basis.

Q: Is it current or superseded?

A: ISO's catalogue lists ISO 1572:1980 as published and repeatedly confirmed in periodic reviews; users should check with ISO or their national standards body for the most current status or any later revisions or withdrawals.

Q: Is it part of a series?

A: It is one of the ISO standards developed under the technical committee responsible for tea (ISO/TC 34/SC 8). It complements other tea-related standards but is a standalone method focused specifically on preparing ground samples with known dry matter content.

Q: What are the key keywords?

A: Tea; dry matter; moisture content; oven drying; sample grinding; laboratory method; ISO 1572.