ISO 7742-1988 PDF

Full title and description

ISO 7742:1988 — Solid fertilizers — Reduction of samples. Specifies a reproducible mechanical method for reducing a bulk sample of solid fertilizer to a smaller representative portion by passage through a rotating sample divider and subsequent rejection or recombination of fractions suitable for further analysis or storage.

Abstract

The method consists of passing the material through a rotating sample divider, collecting the fractions and then rejecting or recombining selected fractions so that a representative reduced sample is obtained. The procedure is applicable to masses above a minimum determined by particle size and number. The standard is short (technical method) and focuses on reproducible, mechanical sample reduction for solid fertilizers.

General information

• Status: Published; confirmed as current in periodic ISO reviews.
• Publication date: 23 June 1988 (Edition 1, 1988).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 65.080 — Fertilizers.
• Edition / version: Edition 1 (1988).
• Number of pages: 6.

Key bibliographic and lifecycle details above are recorded in the ISO catalogue and national standards distributors. The ISO catalogue lists the standard as ISO 7742:1988, developed by ISO/TC 134 (Fertilizers, soil conditioners and beneficial substances), and indicates the short technical length typical of sample-handling procedures.

Scope

Specifies a mechanical procedure for reduction of bulk samples of solid fertilizers to obtain representative test portions. The procedure uses a rotating sample divider and describes selection, collection and recombination or rejection of fractions to produce a reduced sample suitable for subsequent testing. It applies where the mass to be reduced exceeds a minimum defined by particle size and number. The method is intended for routine laboratory and quality-assurance sampling of solid fertilizer products.

Key topics and requirements

• Use of a rotating sample divider (rotary sample splitter) to achieve representative partitioning of bulk material.
• Procedures for collection, rejection and recombination of fractions to obtain required reduced mass.
• Minimum sample mass considerations tied to particle size and particle count to ensure representativity.
• Guidance to select suitable equipment and fraction-handling procedures for different fertilizer types.
• Intended outcomes: reproducible, unbiased reduced samples appropriate for laboratory analysis and QA.

Typical use and users

Laboratories performing compositional and quality analyses of solid fertilizers; manufacturers and quality-control teams who need to prepare representative test portions from bulk lots; national and private testing bodies validating compliance with product specifications; and standards bodies referencing a harmonized sample-reduction technique for inter-laboratory comparability. The method is typically used during sample preparation prior to chemical or physical testing.

Related standards

ISO 7742:1988 is part of the ISO/TC 134 family of standards addressing fertilizers and related materials (ICS 65.080). Related documents cover fertilizer sampling, minimum sample mass, classification and composition test methods (examples in the TC 134 portfolio). Users often apply ISO 7742 together with other sampling and test method standards in the fertilizer series to ensure representative sampling and consistent test results.

Keywords

fertilizers, solid fertilizers, sample reduction, sample splitting, rotating sample divider, representative sample, sample preparation, ISO/TC 134, sampling procedure

FAQ

Q: What is this standard?

A: ISO 7742:1988 is an International Standard that specifies a mechanical method (rotating sample divider) for reducing bulk solid fertilizer samples to representative smaller portions for testing and analysis.

Q: What does it cover?

A: It covers the procedure for passing material through a rotating sample divider, collecting fractions and rejecting or recombining fractions so that a representative reduced sample is produced; it includes requirements on applicability related to minimum mass, particle size and number.

Q: Who typically uses it?

A: Analytical laboratories, fertilizer manufacturers and quality-control personnel, testing and inspection bodies, and anyone needing a repeatable, unbiased method to prepare test portions from bulk solid fertilizers.

Q: Is it current or superseded?

A: As of the latest ISO catalogue lifecycle entries, ISO 7742:1988 remains published and has been confirmed in ISO’s periodic reviews (confirmed status recorded in ISO’s lifecycle). There is no record in the ISO catalogue of a newer revision superseding this 1988 edition. Users should check the ISO catalogue or national bodies for the absolute latest status before relying on the standard for compliance.

Q: Is it part of a series?

A: It is part of the broader ISO/TC 134 work on fertilizers and related standards (ICS 65.080); it is commonly used alongside other sampling, classification and test-method standards within that portfolio.

Q: What are the key keywords?

A: Fertilizer sampling; sample reduction; sample divider; representative test portion; rotating sample splitter; solid fertilizers.