Analytical Services for the Environmental Sector


PAHs are a group of over 100 different compounds formed during the incomplete burning of coal, oil & gas and other organic substances. More Details

The Physiologically Based Extraction Test  (PBET) is used to provide site specific estimates of bioavailable arsenic from soil.

CLEA SGV for arsenic is 32 mg/kg. This is based on the assumption that 100% of the arsenic in soil is taken up by the systemic circulation (i.e. bioavailable).

In most cases, only a fraction of the total arsenic is bioavailable. This fraction can be quantified using the Physiologically Based Extraction Test (PBET).

The PBET recreates conditions found in the gastro-intestinal tract of a small child.

It is a 2 phase extraction – simulating conditions in the stomach and small intestine.

Extracts are analysed for arsenic by ICP-MS.

Results for total arsenic are reported along with percentage of the total, which is bioavailable.

The method can also be used for other metals such as lead, chromium, nickel, mercury, cadmium, copper and zinc.

For more information contact Our Technical Manager Keith Jones

Pyrethrins are insecticides that are derived from the extract of Chrysanthemum flowers. Pyrethroids are synthetic (human-made) forms of pyrethrins.


This presentation  discusses Laboratory Data Variability.

Site Investigation and the assessment of contaminated land is a complex process, involving factors such as:-
Site History, Sampling and Laboratory Data Variability

Apparent Anomalous & inconsistent laboratory results can result in delays & cost implications

An awareness and appreciation of laboratory data variability can assist the site engineer / consultant in evaluating the correlation between the site history and laboratory results as well as identifying any apparent site anomalies. ( presentation )

Please contact   Phil ,  Amy  or  Sales  if you have any questions.

FotorCreated_Site Variation

Assessing Petroleum Degradation using Chromatograms

Laboratories utilise a number of techniques to determine levels of TPH Degradation. As part of the process, the Chemist will review Chromatograms and will consider several factors:-

Ref [1]

Compound depletionSpecific compounds are more resistant to biodegradation and their presence or depletion can be used to assess weathering
Carbon range
The n-alkane distributionThe n-alkanes in middle distillates, such as diesel fuel, heating oils or kerosene, normally show an even distribution, evidenced by a bell-shaped. An uneven or jagged distribution is often evidence of degradation
Unresolved complex mixture (UCM)The UCM is the hump at the base of a GC/FID trace and a mixture of complex cyclo- and iso-alkanes that are unresolvable through conventional gas chromatography(McGovern, 1999).
Heavy versus light n-alkanesUnder aerobic conditions, lighter n-alkanes are normally
removed quicker compared to the heavier n-alkanes (Mohantya & Mukherji, 2008).

In addition to the above, at Chemtest, we also utilise GCxGC traces, which provide us with further lines of evidence.

Please contact  Chemtest  if you have any questions  regarding testing samples to determine levels of degradation.

Find out more information on Environmental Forensics Here

Ref [1]: Gil Oudijk (2012). Age Dating of Middle-Distillate Fuels Released to the Subsurface Environment, Earth Sciences, Dr. Imran Ahmad Dar (Ed.), ISBN: 978-953-307-861-8, InTech, Available from:



Atrazine is part of the Triazine chemical class, which includes Simazine and Propazine due to their common mechanism of toxicity. The scientific name for Atrazine is 6-chloro-N-ethyl-N’-(1-methylethyl)-triazine-2,4-diamine. After atrazine has been applied to soils, it will remain there for several days to several months.


What is the Difference between Metals analysis by ICP-OES and ICP-MS?

Follow this link to find out which Metals test is the most suitable for your environmental samples.

If you would like more advice why not contact Chemtest’s  Sales team  /  Experts

Metal Contamination

What can Chemgenie do for you?

Chemgenie – An Innovative Mobile Site App for the Environmental Industry

Chemgenie is a free mobile App, available for both Apple and Android devices, which has been developed  to provide clients with a quick and simple capability to manage their consumables, collections and testing, regardless of where they are. Anytime & Anywhere …


Chemgenie App allows the site engineer to

  • View Quotes
  • Schedule testing efficiently
  • Arrange couriers
  • Scan Barcodes
  • Locate the site automatically via GPS
  • List recently used contacts and addresses
  • Email relevant files for added assurance of data

Tasks that previously required site workers to manually complete detailed paperwork, or to liaise with their office or the laboratory for assistance, can now be seamlessly fulfilled on site.  Chemgenie allows clients to spend less time organising samples and containers, allowing them more time more time on everything else!

Chemgenie is now available  for free in the App Store.

Download Chemgenie today.

If you would like more information, why not contact Chemtest’s  Sales team  /  Experts ?


Chemtest’s  Free Autumn Training Event 20th October 

9:30- 16:00


Section 1: Guest Speakers (Waste, Topsoil, Environmental Case Study )- TBC

Section 2: The Laboratory Process, Deviating Samples, Understanding Laboratory Data Variability, Quality

Section 3: Asbestos, Microbiology, Scheduling correct & fit for purpose Tests

Section 4: Interactive Seminar on Advances & Innovations in Environmental Testing

Reserve your place today

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