Overview
ISO 4388:1991 is an international standard issued by the International Organization for Standardization (ISO) that specifies a direct spectrometric method for determining the smoke condensate retention index of cigarette filters. This empirical, practical, and rapid analytical procedure focuses specifically on smoke condensate retained by a cigarette filter and uses spectrometry at 450 nm to quantify retention.
The standard applies exclusively to filter cigarettes and excludes those with colored filters or with special additives such as alkaline compounds or activated charcoal. It provides a quantitative measure expressed as a percentage that reflects the ratio of smoke condensate mass retained by the filter relative to the condensate reaching the filter.
Key Topics
- Smoke Condensate Retention Index: The core metric defined by ISO 4388:1991, calculated as the mass ratio expressed in percentage of smoke condensate retained by the cigarette filter compared to the condensate present on the filter surface.
- Direct Spectrometric Measurement: Utilizes spectrophotometry at a wavelength of 450 nm to assess absorbance of methanol solutions containing the smoke condensate extracted from cigarette filters.
- Sample Conditioning and Preparation: Standardized procedures for conditioning cigarette samples in balanced atmospheres, followed by extraction of smoke condensate into methanol from both filter material and cigarette residue.
- Analytical Equipment and Reagents: Specifies the use of methanol with low water content, quartz cuvettes with matched optical paths, centrifuge, and a routine analytical smoking machine compliant with ISO 3308 and ISO 4387.
- Calculation Method: The retention index is computed from the ratio of absorbance readings between filter extracts and condensate collected from the smoke trap, adjusted appropriately for sample dilution and optical path length.
- Scope Limitations: Method is not designed to analyze individual chemical constituents of smoke condensate but focuses on total condensate mass retention.
Applications
- Quality Control in Tobacco Industry: Used by cigarette manufacturers and testing laboratories to monitor filter efficiency in retaining smoke condensate, which is an important factor influencing smoke composition and consumer experience.
- Regulatory Compliance Testing: Facilitates compliance assessment with filter performance standards in jurisdictions where smoke retention metrics are regulated or form part of product certification.
- Research and Development: Assists in the evaluation of new filter materials and designs by enabling rapid, reproducible measurement of condensate retention properties.
- Comparative Analysis: Enables standardized comparison of filters from different cigarettes or production batches, important for consistency in product performance.
Related Standards
- ISO 4387:1991 - Specifies the routine analytical smoking machine method for determining total particulate matter and related substances in cigarette smoke, providing context for sample generation.
- ISO 8243:1991 - Specifies procedures for cigarette sampling, crucial for selecting representative samples for analysis.
- ISO 3308:1991 - Defines parameters and conditions for routine analytical smoking machines to ensure consistency in smoking regime.
- ISO 3402:1991 - Describes the conditioning and atmosphere for tobacco and tobacco products to maintain sample integrity prior to testing.
Keywords: ISO 4388, smoke condensate retention index, cigarette filter testing, spectrometric method, tobacco product standards, cigarette smoke analysis, filter efficiency, smoke condensate measurement, cigarette quality control, ISO smoking machine standards.
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