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Naphthalene--an environmental and occupational toxicant
Ralf Preuss1, Jürgen Angerer, Hans Drexler
1University of Erlangen-Nuremberg, Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Schillerstrasse 25/29, 91054 Erlangen, Germany.
International Archives of Occupational and Environmental Health
|August 16, 2003
Summary
Naphthalene is now considered a potential human carcinogen, necessitating new exposure limits. This review examines environmental and occupational exposure, proposing a new hygiene-based limit for airborne naphthalene to protect public health.
Area of Science:
- Environmental Health
- Toxicology
- Occupational Health
Background:
- Naphthalene, previously considered non-carcinogenic, is now classified as a potential human carcinogen by international agencies since 2000.
- Regulatory bodies worldwide are reassessing naphthalene's risks due to new evidence of its carcinogenicity.
- Understanding human exposure is crucial for comprehensive risk assessment and developing protective measures.
Purpose of the Study:
- To review ambient monitoring studies on external naphthalene exposure from environmental and occupational sources.
- To summarize findings from biological monitoring studies assessing internal naphthalene burden.
- To propose a new hygiene-based exposure limit for naphthalene.
Main Methods:
- Review of ambient monitoring studies for environmental and occupational naphthalene exposure.
- Compilation and analysis of biological monitoring data, focusing on urinary metabolites (1-naphthol, 2-naphthol).
- Toxicokinetic and metabolic analysis to understand naphthalene's carcinogenicity.
Main Results:
- Naphthalene exposure occurs through various environmental pathways (air, water, soil, food) and occupational settings.
- A new hygiene-based exposure limit of 1.5 mg/m³ (0.3 ppm) is proposed based on ambient monitoring data.
- Internal naphthalene burden is primarily assessed via urinary metabolites, but biological tolerance levels are not yet established.
Conclusions:
- Current knowledge gaps exist regarding effective protection against naphthalene health risks.
- Further research into naphthoquinone adducts with macromolecules may provide better health effect estimations.
- Establishing biological exposure indices is necessary for accurate internal dose assessment.