ISO 10084-1992 PDF

Full title and description

ISO 10084:1992 — Solid fertilizers — Determination of mineral‑acid‑soluble sulfate content — Gravimetric method. This International Standard specifies a routine laboratory gravimetric procedure for measuring mineral‑acid‑soluble sulfate (expressed as SO3) in solid fertilizer materials; the method reports results as percentage by mass and is published by ISO.

Abstract

ISO 10084:1992 defines a gravimetric analytical procedure in which acid‑soluble sulfates are dissolved, precipitated as barium sulfate (BaSO4), filtered, washed, dried/ignited and weighed. The method is intended for fertilizers with sulfate contents (as SO3) in the approximate range 3% to 50% (m/m) and includes required reagents, apparatus, sample‑preparation references and the calculation for converting BaSO4 mass to SO3.

General information

• Status: Published (ISO standard; version confirmed on review and remains current as listed by ISO).
• Publication date: 1992 (official ISO listing: December 1992; many catalogues record 25 November 1992).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 65.080 — Fertilizers.
• Edition / version: Edition 1 (1992).
• Number of pages: 3 pages (ISO bibliographic record).

Scope

Specifies a gravimetric method for the determination of mineral‑acid‑soluble sulfate content of solid fertilizers. The procedure applies to fertilizers whose sulfate content, expressed as SO3, falls roughly between 3% and 50% (m/m). The standard references ISO 8358 for sample preparation and gives instructions on test‑portion selection, reagents, apparatus and calculation/reporting of results.

Key topics and requirements

• Analytical principle: dissolve acid‑soluble sulfates in mineral acid, precipitate sulfate as BaSO4, filter/wash, dry/ignite and weigh the precipitate (gravimetric determination).
• Applicable range: method intended for materials with SO3 from about 3% to 50% (m/m).
• Normative reference: sample preparation according to ISO 8358 (1991) is cited as the sample‑preparation procedure.
• Reagents and verification: requires analytical‑grade HCl, barium chloride (for precipitation), silver nitrate (for chloride test during washing) and other routine reagents; chloride removal checks are specified.
• Apparatus and conditions: ordinary laboratory glassware plus specified filter crucibles (porosity P10), ovens (≈120 °C for drying and ≈800 °C for ignition), hot‑plate and desiccator; weighing precision and wash procedures are specified.
• Calculation: conversion of mass of BaSO4 precipitate to SO3 content using the factor provided in the standard (procedure and rounding rules described).

Typical use and users

Used by fertilizer testing laboratories, quality control departments in fertilizer manufacturing, agricultural laboratories, regulatory testing bodies and research institutes concerned with fertilizer composition and compliance. The method is intended for routine determinations where a gravimetric result for acid‑soluble sulfate is acceptable.

Related standards

Normative reference ISO 8358:1991 (sample preparation for chemical and physical analysis of solid fertilizers) is cited. Other related documents and methods for fertilizer analysis and for alternate sulfate determinations (e.g., instrumental methods, wet‑chemical alternatives) are generally maintained under ISO/TC 134 (Fertilizers); users should consult the ISO catalogue or national standards bodies for national adoptions and any later methods.

Keywords

ISO 10084, solid fertilizers, sulfate, SO3, gravimetric method, barium sulfate, fertilizer analysis, ISO/TC 134, ISO 8358.

FAQ

Q: What is this standard?

A: ISO 10084:1992 is an International Standard that specifies a gravimetric laboratory method for determining the mineral‑acid‑soluble sulfate content of solid fertilizers.

Q: What does it cover?

A: It covers the analytical principle, required reagents and apparatus, sample‑preparation reference (ISO 8358), the step‑by‑step precipitation/filtering/drying/ignition/weighing procedure, calculation to convert BaSO4 mass to SO3 and reporting conventions for routine fertilizer testing.

Q: Who typically uses it?

A: Fertilizer manufacturers' QC labs, independent analytical/testing laboratories, agricultural research institutions and regulatory authorities performing compliance or specification testing for fertilizers.

Q: Is it current or superseded?

A: According to ISO's bibliographic record, this 1992 edition was last reviewed and confirmed (review status noted) and is listed as published/current by ISO; catalogues and national bodies show the standard as active. Users should verify with their national standards body or ISO catalogue for any amendments, national adoptions or more recent replacements before relying on it for regulatory compliance.

Q: Is it part of a series?

A: ISO 10084 is part of the body of ISO standards and technical work maintained by ISO/TC 134 on fertilizers and related materials; it references ISO 8358 for sample preparation and complements other fertilizer analytical methods published under the same technical committee.

Q: What are the key keywords?

A: Sulfate, SO3, solid fertilizers, gravimetric, barium sulfate, fertilizer analysis, ISO 10084, ISO 8358.