BenzeneDetecting benzene

Formula: C6H6 | CAS: 71-43-2

Benzene detection: Long-term exposure to benzene mainly harms the bone marrow, the soft, inner parts of bones where new blood cells are made.

Where is it found?

You might encounter benzene exposure at work during certain jobs in:

  • Oil refineries
  • Chemical and petrochemical plants, including some offshore installations
  • Coke works
  • Foundries, during casting (where benzene sulphonic catalysts are used)
  • The storage, distribution and use of petrol or benzene itself

Human exposure to benzene has been associated with a range of acute and long-term adverse health effects and diseases, including cancer and aplastic anaemia. Public health actions are needed to reduce the exposure of both workers and the general population to benzene.
– The World Health Organisation (WHO)

Ensuring safe workplace exposure limits by using benzene detection equipment.

Protecting both people and the environment whilst meeting the operational needs of your business is a very important role and, if you have operations in the UK you will be well aware of the requirements of the Control of Substances Hazardous to Health (CoSHH) Regulations and likewise the Code of Federal Regulations (CFR) in the US.

Similar legislation exists worldwide, the common theme being an onus on hazard identification, risk assessment and the provision of appropriate control measures (bearing in mind the hierarchy of controls) as well as health surveillance in some cases.

Unlike other health and safety issues that are managed by risk assessment, this can only be determined by monitoring.

There are several detection solutions on the market but photoionisation detection (PID) has proven to be the ideal sensor. ION Science’s MiniPID solutions available are as follows:-

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Gas Factsheet

Everything you need to know about benzene detection

Our Gas Factsheets which is available to download below provides you with key information on the exposure limits and the locations of where potentially harmful gases can occur. We also share information on gas detection monitoring techniques and equipment that can help you manage gas detection in the workplace, for worker and site safety.


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Benzene detection

Formula: C6H6 | CAS: 71-43-2

Synonyms: benzene, benzolene, carbon oil, coal naptha, cyclohexatriene, phenyl hydride, pyrobenzol, benzol, benzole, cyclohexatriene, pyrobenzole, benzine, pyrobenzol, benzolene, [6]annulene, carbon oil, rcra waste number u019, 2,5-cyclohexadien-1,4-ylene, benzinum, benzolum, aromatic alkane

Benzene is a major constituent of crude oil, an excellent fuel and solvent and a precursor used in the manufacture of many chemicals, particularly upon reaction to form cyclohexane, ethyl benzene and cumene.

Specification Value/Information
Formula C6H6
CAS no. 71-43-2
Gas Response Factor, 11.7 eV 0.53
Gas Response Factor, 10.6 eV 0.5
Gas Response Factor, 10.0 eV 0.54
ppm per mg/m⁻³, (20 °C, 1 bar) 0.308
Molecular Weight, g/mole 78.0
Melting point, °C 6
Boiling point, °C 80
Flash point, °C -11.1
Specification Value/Information
Upper Explosive Limit, % 7.9
Lower Explosive Limit, % 1.3
Density,⁻³ 0.8765
Ionisation Energy, eV 9.24378
EH40 TWA, ppm 1
EH40 TWA, mg.m⁻³ 3.25
NIOSH ST, ppm 1
NIOSH TWA REL, ppm 0.1
NIOSH IDLH, ppm 500

Related Products

10.0 eV Gas Sensor – MiniPID 2

Range: 0 to >100 ppm. Minimum detection limit: 5 ppb. 10.0 eV lamp. The 10.0 eV gas sensor - MiniPID 2 is used for enhanced selectivity of compounds with lower ionisation energies.

Product Details
High Sensitivity Gas Sensor – MiniPID 2

Range: 0 to 3 ppm. Minimum detection limit: 0.5 ppb. 10.6 eV lamp. The high sensitivity gas sensor, is the highest sensitivity gas sensor for sub PPB level detection.

Product Details
PPB Gas Sensor – MiniPID 2

Range: 0 to >40 ppm. Minimum detection limit: 1 ppb. 10.6 eV lamp. The PPB gas sensor - MiniPID 2 is optimised to deliver an exceptionally low background which allows for optimum low-end sensitivity.

Product Details
PPM Gas Sensor – MiniPID 2

Range: 0 to 4000 ppm. Minimum detection limit: 100 ppb. 10.6 eV lamp. The PPM gas sensor - MiniPID 2 is designed for detecting VOCs over the widest dynamic range on the market without compromising performance.

Product Details

Related Guides

Benzene Health and Safety Operational Efficiency

The benzene health and safety operational efficiency guide provides information about fugitive emissions, operational efficiency and plant turnaround.

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An introductory guide to benzene exposure legislation

An introductory guide to benzene exposure legislation provides information on understanding as an employee/worker what your workplace exposures are.

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Benzene Monitoring – PID Buyers Guide

An introductory guide to benzene exposure legislation provides information on the massive benefits of using Photoionisation Detection (PID) technology.

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Benzene Related Health Issues Guide

A Guide to benzene related health issues provides information on exposure limits and how the government is planning to review and reduce exposure limits.

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How to Monitor Benzene – The Complete Guide

The how to monitor benzene guide identifies why it is vitally important that health dangers and legislative provision are understood to limit exposure.

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The Basics Of Benzene

The basics of detecting benzene guide for workers/site safety assists the reader in finding the correct detector to monitor benzene efficiently and safely.

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