ISO 936:1998

Overview

ISO 936:1998 - Meat and meat products - Determination of total ash is an internationally recognized standard developed by the International Organization for Standardization (ISO). This standard specifies a method for the determination of the total ash content in all types of meat and meat products, including poultry. Determining total ash is essential for assessing the mineral content and the overall quality and authenticity of meat products. The procedure involves incinerating a prepared sample at specific conditions and quantifying the residue, expressed as a percentage of the sample mass.

Key Topics

• Total Ash Content: The method establishes how to measure the residual inorganic matter (ash) after incineration of meat or meat product samples.
• Sample Preparation: It details requirements for homogenizing and handling samples to prevent compositional changes before analysis.
• Incineration Protocol: The standard prescribes incinerating the sample at 550 ± 25 °C, using a muffle furnace with or without a programmable controller, and subsequent weighing steps.
• Analytical Equipment: Includes specifications for necessary laboratory apparatus such as muffle furnace, desiccator, analytical balance, and appropriate sample dish materials.
• Calculation and Reporting: Provides guidance on calculating ash content and reporting results, including repeatability and reproducibility considerations.

Applications

The procedure outlined in ISO 936:1998 has several practical applications in the food industry, laboratory analysis, and regulatory environments:

• Quality Assurance: Enables manufacturers and laboratories to assess the mineral content of meat products to ensure compliance with nutritional labeling and food safety standards.
• Regulatory Compliance: Supports food inspectors and regulatory bodies in verifying the authenticity and composition of meat and meat products.
• Product Development: Assists food scientists and product developers in monitoring the ash content during formulation and processing.
• Authenticity Testing: Helps identify adulteration or mislabeling by detecting unusual mineral levels.
• Laboratory Accreditation: Laboratories seeking ISO accreditation can reference ISO 936:1998 as a validated procedure for ash determination.
• Research and Method Standardization: Facilitates comparison of results across different laboratories and jurisdictions by providing a harmonized testing protocol.

Related Standards

Organizations and laboratories using ISO 936:1998 may also refer to complementary international standards to ensure comprehensive analysis and quality control:

• ISO 3100-1:1991: Meat and meat products - Sampling and preparation of test samples - Part 1: Sampling
• ISO 3696:1987: Water for analytical laboratory use - Specification and test methods (for reagent water requirements)
• ISO 5725 series: Accuracy (trueness and precision) of measurement methods and results (for repeatability and reproducibility)
• NMKL Method No 23 (1991): Gravimetric determination of moisture and ash in meat products (Nordic Committee on Food Analysis)

Practical Value

Adopting ISO 936:1998 ensures reliable, comparable, and reproducible results for ash determination in meat and meat products. Its use is crucial in food testing laboratories, meat processing facilities, and regulatory agencies, helping maintain product integrity and consumer safety.

Keywords: ISO 936:1998, total ash determination, meat products, laboratory testing, food quality standards, incineration analysis, mineral content, food authenticity, international standard, quality assurance.