Fruit and vegetable products -- Determination of tin content
Fruit and vegetable products -- Determination of tin content
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SIST ISO 2447:1998 is an international standard specifying the determination of tin content in fruit and vegetable products. Developed by ISO Technical Committee 34 (Agricultural Food Products) and Subcommittee SC 3 (Fruit and Vegetable Products), this method is essential for assessing tin levels to ensure product safety and compliance with regulatory limits. The standard replaces the first edition from 1974, reflecting technical updates to improve accuracy and reliability.
This standardized chemical analysis method applies to fruit and vegetable products that may contain trace amounts of copper, lead, zinc, and phosphorus within specified limits. It leverages a colorimetric analysis technique involving complex formation and photometric measurement to quantify tin content accurately.
Scope and Applicability The method is suitable for samples containing up to 1.25g/kg copper, 0.6g/kg lead, 6g/kg zinc, and 40g/kg phosphorus. It is specifically designed for fruit and vegetable derived products and provides a reliable way to detect tin concentrations.
Analytical Principle Organic matter is destroyed using sulfuric and nitric acids to convert tin into its stannic form. Tin then forms an orange complex with phenylfluorone in a buffered pH 1.0–1.2 solution. Potential interference from iron(III) is mitigated by reduction with ascorbic acid before colorimetric measurement at 505 nm.
Reagents and Equipment The method requires analytical-grade reagents including sulfuric acid, nitric acid, phenylfluorone reagent, and buffer solutions. Equipment includes volumetric flasks, pipettes, a spectrophotometer or photocolorimeter with a green filter, and an analytical balance with 0.001g precision.
Procedure Steps
Quality Assurance Repeatability is confirmed by performing duplicate tests on the same sample. The difference between two independent results must not exceed 5% of their average value, ensuring precise and consistent outcomes.
SIST ISO 2447:1998 is valuable in various sectors related to agricultural and food safety, particularly for:
Food Quality Control Monitoring tin content in canned or processed fruit and vegetable products to comply with food safety regulations and avoid contamination risks.
Regulatory Compliance Assisting manufacturers and testing laboratories to verify tin concentrations within permissible limits mandated by national and international food safety authorities.
Research and Development Supporting formulation studies and ingredient sourcing to minimize unwanted tin residues in fruit and vegetable derivatives.
Import and Export Inspection Enhancing confidence and verification in global trade by providing a harmonized method for tin analysis.
ISO 5515:1979 Specifies the wet method for decomposition of organic matter prior to analysis, which is referenced in ISO 2447 as a preparatory step.
ISO/TC 34 Series Covers other food and agricultural products standards concerning chemical analysis, contamination, and product safety.
For laboratories specializing in food product testing, SIST ISO 2447:1998 offers a robust, validated method for colorimetric determination of tin, ensuring reproducible results and support for safe fruit and vegetable consumption worldwide.
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