Volatile Organic Compound Measuring

For VOCs (Volatile Organic Compounds) we provide a range of tubes with varying sorbents inside to meet the specific applications required by the customer. Our stainless steel tubes can measure compounds in the range of C2-C28.

VOC emissions into ambient air originate from a variety of sources. These hazardous gases can present health problems and are therefore widely monitored for compliance with air quality guidelines.

We supply tubes for both passive and active sampling; For passive sampling a diffusive cap is supplied with the tubes, which is to be fitted to the sampling end of the tube during exposure. For active sampling, a pre-calibrated air pump is connected to the non-sampling end of the tube and run for a pre-set period. 

Outdoor sources of VOC air pollution:

  • Vehicles
  • Industrial processes (including stack emissions)
  • Fossil fuels
  • Pesticides
  • Tobacco smoke

Indoor sources of VOC pollution:

  • Building materials
  • Paints and permanent markers
  • Adhesives
  • Cleaning products and air fresheners, including dry-cleaned clothing
  • Refrigerants
  • Furnishings
  • Photocopiers
  • Solvents
  • Fuels
  • Tobacco smoke

VOCs can be measured from low parts per billion (ppb) to parts per million (ppm) levels using these thermal desorption sorbent tubes. Sampling times start from 1 hour for pumped sampling up to 4 weeks for passive sampling.

VOCs in soil can also be monitored with these tubes in conjunction with soil probes. Soil contamination can occur in proximity to oil refineries, chemical plants, landfill, petrol stations and industrial sites.

Commonly requested applications:

  • Benzene
  • BTEX
  • PAH detection
  • Total VOC
  • Etc.

Potential implications of VOC pollution:

  • Eye, nose and throat irritation
  • Nausea and headaches
  • Fatigue
  • Dizziness
  • Allergic skin reaction
  • Involved in ground-level Ozone formation

VOC monitoring is beneficial to a wide range of organisations such as Local Authorities, Environmental Consultants and Private Companies.

For more information select the downloads option below to download copies of our instructions and technical data sheets.  

This tube can be packed with a range of sorbents to meet monitoring needs. Gradko can supply different tubes which will cover compounds in the range C2-C28.

The tubes for passive monitoring typically contain one type of sorbent, to cover a specific range of compounds. For pumped sampling tubes can contain one, two or three sorbent types, allowing a broader range of compounds to be monitored.

Commonly requested applications for volatile organic compound measuring include:

  • BTEX analysis from vehicle emissions
  • Benzene monitoring
  • Butadiene (C4H6) monitoring and analysis
  • Total petroleum hydrocarbon analysis
  • Landfill gas emissions detection
  • PAH detection
  • BREEAM analysis
  • Anaesthetic gas monitoring for occupational exposure assessments (please see anaesthetics product page).

Tube hire – please contact our Technical Advice department to discuss the most appropriate sorbent to use

Analysis options:

A wide range of analysis options are available to suit each individual customers requirements, including:

  • Top 5 or 5 named compounds
  • Top 10 or 10 named compounds
  • Top 15 or 15 named compounds
  • Top 20 or 20 named compounds
  • Full scan analysis – reporting of all compounds found on the tube (down to 10ng concentration)
  • Reporting of Total VOCs
  • Identification and Estimation or quantitative analysis

Analysis is carried out in our UKAS accredited laboratories. Results are provided within 10 working days or can be fast-tracked by arrangement.

Featured Product

Washers - Pack of 10

These washers fit around the diffusion tubes allowing them to sit comfortable inside our circular clips.

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