Overview
SIST EN ISO 11212-1:1998 is an international standard developed by CEN in alignment with ISO guidelines. It specifies a reliable analytical method for the determination of arsenic content in starch and derived products using atomic absorption spectrometry (AAS) with hydride generation. This standard ensures accurate monitoring of heavy metals content in starch materials, which is critical for food safety, regulatory compliance, and quality control.
The method focuses on quantifying arsenic (As) in micrograms per kilogram (μg/kg) through a combination of sample digestion, hydride generation, and spectrometric measurement at a wavelength of 193.7 nm. It applies to starch, its derivatives, and by-products, enhancing safety standards across diverse industrial applications.
Key Topics
- Scope: Determines arsenic concentration in starch products using atomic absorption spectrometry.
- Principle:
- Wet digestion of organic matrices with nitric acid and hydrogen peroxide.
- Reduction of arsenic ions (As³⁺) to arsine gas via sodium borohydride in acidic medium.
- Detection using atomic absorption spectrometry with hydride generation at 193.7 nm wavelength.
- Reagents and Apparatus:
- Use of high-purity reagents such as nitric acid, sodium borohydride, and arsenic standard solutions.
- Borosilicate glass digestion equipment and a specialized hydride generator.
- High-resolution AAS equipment with arsenic hollow cathode lamp.
- Procedure:
- Homogenization of test samples followed by reflux digestion.
- Calibration using standard arsenic solutions for accuracy.
- Measurement of sample absorbance with blank correction.
- Precision and Validation:
- Defines repeatability and reproducibility limits based on interlaboratory studies.
- Quantification limit reaches as low as 20 μg/kg, supporting detection of trace arsenic levels.
- Test Reporting:
- Requires comprehensive documentation including sampling methods, test results, and any procedural deviations.
Applications
- Food Industry: Ensures safety and compliance by quantifying toxic arsenic levels in starch-based food products and ingredients.
- Quality Control Labs: Enables precise arsenic monitoring during starch production and processing for risk mitigation.
- Regulatory Compliance: Assists manufacturers in meeting international heavy metals limits in foodstuffs and additives.
- Research and Development: Supports product testing and formulation involving starch derivatives with focus on contaminant assessment.
- Environmental Monitoring: Facilitates analysis of heavy metals in agricultural starch raw materials and by-products.
Related Standards
EN ISO 11212 forms part of a series addressing heavy metals in starch and derived products, including:
- Part 2: Determination of mercury content by atomic absorption spectrometry
- Part 3: Determination of lead content by atomic absorption spectrometry with electrothermal atomization
- Part 4: Determination of cadmium content by atomic absorption spectrometry with electrothermal atomization
These complementary standards provide a comprehensive framework for heavy metals testing, ensuring holistic safety evaluation of starch products.
Keywords: SIST EN ISO 11212-1:1998, arsenic determination, starch heavy metals testing, atomic absorption spectrometry, hydride generation AAS, food safety standards, starch derivatives arsenic content, heavy metals analysis, arsenic quantification method, analytical chemistry starch products
