SIST ISO 6636-3:1995 PDF

Name: SIST ISO 6636-3:1995 — Fruit and vegetable products -- Determination of zinc content -- Part 3: Dithizone spectrometric method
SKU: SIST ISO 6636-3:1995
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Fruit and vegetable products -- Determination of zinc content -- Part 3: Dithizone spectrometric method

Название (английский):

SIST ISO 6636-3:1995

Fruit and vegetable products -- Determination of zinc content -- Part 3: Dithizone spectrometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 марта 1995 г.
ICS:: 67.080.01
Технический комитет:: KŽP - Agricultural food products

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Описание (английский):

The method consists in decomposing of organic matter, neutralizing of the solution obtained, adding of 1,5-diphenylthiocabazone solution, extracting of the zinc complex thus furmed with chloroform and measuring of the absorbance of the extract at a wavelength of 538 nm.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

SIST ISO 6636-3:1995 is an international standard developed by ISO for the determination of zinc content in fruit and vegetable products using the dithizone spectrometric method. This method is essential for quality control in the food industry, regulatory compliance, and ensuring food safety standards are met. The procedure is based on decomposing organic matter from food samples, neutralizing the solution, complexing zinc with dithizone, extracting with chloroform, and measuring absorbance at 538 nm. The standard is a valuable reference for laboratories conducting zinc analysis in fruit and vegetable products.

Key Topics

Scope: The standard specifies the use of the dithizone spectrometric method for the quantitative determination of zinc in a wide range of fruit and vegetable products.

Sample Preparation: Guidelines for homogenizing samples and handling frozen products to ensure representative test portions.

Reagents and Apparatus: Use of high-purity reagents, with specific attention to zinc-free laboratory water and equipment. Essential apparatus include volumetric flasks, separating funnels, and a spectrometer capable of measurements at 538 nm.

Analytical Procedure:

Decomposition of the sample's organic matter
Addition of reagents including 1,5-diphenylthiocarbazone (dithizone)
Extraction of the zinc-dithizone complex with chloroform
Measurement of absorbance to determine zinc concentration

Calibration and Quality Assurance: Preparation of standard zinc solutions, calibration curves, and regular validation of spectrometric results. Emphasis on running blank tests and ensuring repeatability.

Reporting: Standardized reporting of results with calculation methods provided, including guidelines for test reports and identification of samples.

Applications

Food Safety: Used by food regulatory agencies and quality control laboratories to ensure that zinc levels in fruit and vegetable products meet national and international safety requirements.

Nutritional Labeling: Supports accurate nutritional analysis for product labeling and consumer information.

Research and Development: Valuable in the development of new products and in nutritional studies evaluating the zinc content of foods.

International Trade: Assists exporters and importers of fruit and vegetable products in demonstrating compliance with zinc residue limits as specified in international agreements.

Related Standards

ISO 5515: Fruits, vegetables, and derived products - Decomposition of organic matter prior to analysis - Wet method. ISO 6636-3 cites this standard for sample preparation.

ISO 6636-1 / ISO 6636-2: Additional parts of the ISO 6636 series specifying alternative methods for determining zinc content in fruit and vegetable products.

General Spectrometric Analysis Standards: Other ISO standards that regulate laboratory practices for spectrophotometric determinations.

SIST ISO 6636-3:1995 ensures reliable and reproducible zinc determination in fruit and vegetable products. Adherence to this standard supports robust food quality assurance programs and helps organizations demonstrate due diligence in regulatory compliance, making it a cornerstone reference in food chemistry laboratories worldwide.

SIST ISO 6636-3:1995 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

SIST ISO 5515:1995

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

SIST ISO 6636-1:1995

Fruits, vegetables and derived products -- Determination of zinc content -- Part 1: Polarographic method

SIST ISO 6636-2:1995

Fruits, vegetables and derived products -- Determination of zinc content -- Part 2: Atomic absorption spectro…