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Hexane: Effects, Toxicity and Exposure Limits

Hexane is an organic solvent belonging to the alkane group, widely used in industry and laboratories, and potentially hazardous to health with prolonged exposure.

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Things worth knowing about "Hexane"

Hexane is an organic solvent belonging to the alkane group, widely used in industry and laboratories, and potentially hazardous to health with prolonged exposure.

What is Hexane?

Hexane (chemical formula: C₆H₁₄) is a colorless, highly volatile, and flammable organic solvent belonging to the group of saturated hydrocarbons (alkanes). It is classified as an aliphatic hydrocarbon and occurs naturally in crude petroleum and natural gas distillates. In practice, the isomer n-hexane (normal hexane) is the most commonly used form and is the most toxicologically relevant.

Sources and Uses

Hexane is used across a wide range of industrial and laboratory applications:

Edible oil extraction: Hexane is widely used to extract vegetable oils (e.g., soybean oil, rapeseed oil, sunflower oil) from seeds.
Adhesives and coatings: As a solvent in glues, paints, and varnishes.
Cleaning agents: In degreasers and cleaning fluids.
Laboratory use: As a solvent and extraction agent in chemical and pharmaceutical laboratories.
Rubber processing: In the manufacture and processing of rubber products.

Health Effects and Toxicology

Hexane is considered hazardous to health, particularly with chronic inhalation exposure to n-hexane vapors. Its toxic effects are primarily caused by the metabolite 2,5-hexanedione, which is produced through oxidation in the body and damages the nervous system.

Acute Toxicity

Dizziness, headache, and nausea following short-term inhalation of high concentrations
Irritation of the eyes, skin, and respiratory tract
At very high concentrations: loss of consciousness and narcotic effects

Chronic Toxicity

Peripheral neuropathy: Prolonged or repeated exposure to n-hexane can cause chronic damage to the peripheral nerves. Symptoms include tingling, numbness, muscle atrophy, and motor weakness, primarily in the hands and feet.
Encephalopathy: Central nervous system damage may also occur at very high exposure levels.
Skin defatting: Repeated skin contact removes natural oils from the skin and can lead to dermatitis.

Exposure Sources and Risk Groups

Workers in the following industries are at particular risk:

Shoe manufacturing and repair (use of hexane-containing adhesives)
Printing and dyeing industries
Food processing (oil extraction facilities)
Laboratory personnel with regular handling of hexane
Automotive repair shops (use as a cleaning agent)

Diagnosis and Detection

Occupational hexane exposure can be monitored and diagnosed through the following methods:

Biological monitoring: Measurement of 2,5-hexanedione in urine as a biomarker for n-hexane exposure
Workplace air sampling: Monitoring of hexane concentration in workplace air
Neurological examinations: Electrophysiological tests (e.g., nerve conduction velocity) when neuropathic changes are suspected

Exposure Limits and Protective Measures

In many countries, occupational exposure limits (OELs) for n-hexane are established by national health and safety authorities. For example, the American Conference of Governmental Industrial Hygienists (ACGIH) sets a threshold limit value (TLV) of 50 ppm (176 mg/m³) as an 8-hour time-weighted average.

Recommended protective measures in the workplace include:

Use of appropriate respiratory protection equipment at elevated exposure levels
Wearing protective gloves and clothing
Adequate ventilation and local exhaust systems at workplaces where hexane vapors develop
Substitution of n-hexane with less toxic solvents wherever possible

Hexane in Food

Residual amounts of hexane can be present in solvent-extracted edible oils. Within the European Union, limits for hexane residues in food products are regulated by Regulation (EC) No. 1881/2006 and Directive 2009/32/EC. When processed correctly, residual levels in food are considered to pose no significant health risk to consumers.

References

World Health Organization (WHO): Environmental Health Criteria 122 - n-Hexane. Geneva: WHO, 1991.
American Conference of Governmental Industrial Hygienists (ACGIH): TLVs and BEIs - Threshold Limit Values for Chemical Substances and Physical Agents, 2023.
European Food Safety Authority (EFSA): Scientific Opinion on the safety and efficacy of hexane as an extraction solvent. EFSA Journal, 2012.

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