ISO 5515:1979 PDF

Name: ISO 5515:1979 — Fruits, vegetables and derived products — Decomposition of organic matter prior to analysis — Wet method
SKU: ISO 5515:1979
Price: 25 EUR
Availability: InStock

Fruits, vegetables and derived products — Decomposition of organic matter prior to analysis — Wet method

Название (английский):

ISO 5515:1979

Fruits, vegetables and derived products — Decomposition of organic matter prior to analysis — Wet method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 февраля 1979 г.
Издание:: ISO IS 5515 edition 1 version 1
ICS:: 67.080.01

Тип поставки:

Full version75 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 раб. дн. (перевод)

Цена:75 €

Описание (английский):

The method consists in heating a test portion until all organic matter is decomposed and a clear solution is obtained, either with sulphuric acid and nitric acid and in certain cases with hydrogen peroxide, or with sulphuric acid and nitric acid with the addition of perchloric acid.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 5515:1979 specifies a wet decomposition (acid digestion) method for the mineral analysis of fruits, vegetables and derived products. The standard describes heating a measured test portion until all organic matter is decomposed and a clear solution is obtained. Two wet routes are covered: digestion with sulfuric acid and nitric acid (with hydrogen peroxide added in some cases), or digestion using sulfuric and nitric acids with the addition of perchloric acid for more refractory samples. The procedure prepares samples for subsequent determination of minerals (ash-forming elements) by analytical techniques.

Key topics and technical requirements

Scope and principle: Complete mineralization of organic matter to a clear solution prior to mineral analysis.

Reagents: Analytical-grade acids - nitric acid, sulfuric acid, optional hydrogen peroxide (30%) and perchloric acid. Acid concentrations and handling are specified.

Apparatus and materials: Borosilicate or quartz Kjeldahl flask, heating support with controlled heat, glass boiling beads, fume hood and glassware washed with hot nitric acid then distilled water.

Operational steps:

Weigh or pipette the test portion (typical 5–10 g or ml) and add specified acid mixtures.
Heat gradually, maintain boiling cycles, monitor for nitrous fumes and the appearance of white fumes indicating removal of nitric acid.
Add water at controlled stages, repeat boiling cycles, and dilute to a defined volume (50 or 100 ml) for mineral analysis.
Use hydrogen peroxide when mineralization stalls; use perchloric acid for samples with high starch or low soluble solids per the standard’s decision rules.

Completion criteria: Solution becomes colorless (or slightly green/yellow) and white fumes indicate strongly sulfuric, nitrite-free conditions.

Safety and precautions: Strong warnings for perchloric acid (explosive risk with organics/dehydrating agents), requirements for incombustible, washable exhaust systems, protective equipment, and strict procedures for handling and neutralization.

Applications and users

Intended for food testing laboratories, agricultural and agro‑food quality control, regulatory authorities, and analytical chemists performing mineral and elemental analysis of fruits, vegetables and derived products.

Practical for sample preparation prior to ICP, AAS, colorimetric or other mineral assays where organic matrix removal is required.

Useful in QA/QC of processed fruit/vegetable products, research labs studying nutrient content, and certification/testing bodies.

Related standards

ISO 5516 - Decomposition by incineration (alternative mineralization method)

ISO 2173 - Soluble solids / refractometric methods (used to guide digestion choice)

ISO 1042 - Volumetric glassware specifications

Keywords: ISO 5515:1979, wet method, decomposition of organic matter, acid digestion, fruits and vegetables, mineralization, perchloric acid safety, sample preparation, analytical chemistry.

ISO 5515:1979 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 5516:1978

Fruits, vegetables and derived products — Decomposition of organic matter prior to analysis — Ashing method

BS ISO 21736:2020

Refractories. Test methods for thermal shock resistance.

BS EN ISO 10427-1:2024

Oil and gas industries including lower carbon energy. Equipment for well cementing. Casing bow-spring central…