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Technical Bulletin: 1,4-Dioxane

Jan 6, 2020

Introduction

1,4-dioxane is an emerging contaminant of concern.  It is highly soluble in water, does not bind to soils and readily leaches to groundwater.  Given 1,4-dioxane’s mobility, a key issue in characterising impacted sites is establishing the extent of migration in groundwater.  1,4-dioxane is not only mobile in the environment but also persistent.

Uses

The main application of 1,4-dioxane was as a stabiliser in common solvents such as 1,1,1-trichloroethane.  Solvents used in de-greasing, electronics and many other applications may have contained 1,4-dioxane.  It is now understood that 1,4-dioxane is widespread in the UK due to its use in personal care products and detergents.  It can also be found in lacquers, paints and plastics and as an impurity in antifreeze and de-icing fluids.

Physical and Chemical Properties of 1,4-dioxane

Chemical Abstracts Services (CAS) Number

123-91-1

Physical description at room temperature

Clear, flammable liquid with faint pleasant odour

Molecular weight (g/mol)

88.11

Water solubility

Miscible

Melting point (°C)

11.8

Boiling point (°C) at 760 mm Hg

101.1

Vapour pressure at 25°C (mm Hg)

38.1

Specific gravity

1.0033

Octanol-water partition coefficient (log kow)

-0.27

Organic-carbon partition coefficient (log Koc)

1.23

Henry’s law constant at 25°C

4.80 x 10-6

Source: ATSDR 2012 Toxicological profile for 1,4-dioxane.  Agency for Toxic Substances and Disease Registry

Potential human health and environmental impacts of 1,4-dioxane

Those unique physical and chemical characteristics identified above, make 1,4-dioxane an increasing focus of controlled waters risk assessment.  The fate and transport properties of 1,4-dioxane create challenges for investigation, assessment remediation.   As such, particular care and experience must be applied to the analysis of 1,4-dioxane in environmental samples.

1,4-dioxane is primarily a contaminant in groundwater.  The miscibility and low sorption potential of 1,4-dioxane, allows it to migrate ahead of other contaminants in extended plumes.  1,4-dioxane has a very low octanol water partitioning coefficient (Log Kow of –0.27) and Henry’s constant (4.8 × 10-6).  Impacts have been identified at drinking water abstractions and focus globally has be on public water supplies.  This mobility and recalcitrance has challenged remediation professionals to redesign existing treatment systems such as air stripping and adsorption to granular activated carbon.

It is classified by United States Environmental Protection Agency (US EPA) as likely to be carcinogenic to humans by all routes of exposure and the International Agency for Research on Cancer (IARC) as a Group 2 probable human carcinogen.

How can ALS help?

ALS can carry out analysis of water samples for 1,4-dioxane by Gas Chromatography-Mass Spectrometry (GC-MS).  The analytical approach adopted increases sensitivity using GC-MS in conjunction with isotope dilution and selective ion monitoring.  The limit of detection is 0.1 µg/l.

Samples should be collected in glass bottles (ALE 219 or ALE 297).  Equipment used in sampling can be a source of cross-contamination.  1,4-dioxane also might be present in detergents used for de-contamination purposes.  When collecting samples for 1,4-dioxane, submission of additional field and equipment blanks is recommended prior to and during sampling to ensure a robust system of QA/QC is followed.

For more information, contact our customer services team: hawardencustomerservices@alsglobal.com or 01244 528777