Stakeholder - ALS Environmental

Reduced limit of detection for sulphide

ALS2ALS Environmental is pleased to announce that following revalidation, our reporting limit for method WAS033, Total and Dissolved Sulphide, will be lowered to 0.020mg/l.

Sulphide can build up in sewer systems and cause corrosion of pipe work and concrete, release noxious odours (hydrogen sulphide) and inhibit treatment processes.

The ALS Environmental method for the determination of Total and Dissolved Sulphide, based on Standard Methods for the Examination of Water and Wastewater, uses a manual colorimetric method (UV-VIS) and is applicable to effluents, leachates, and wastewaters. In an acidic solution, the sulphide reacts with N-N-Diethyl-p-phenylene-diamine in the presence of dichromate ions to produce a coloured complex DPD Blue. A spectrophotometer set at a wavelength of 670nm is used to measure the intensity of the colour, which is proportional to the concentration of sulphide present in each sample.

Download the ALS Environmental Waste Water Brochure

Click here to download our latest UKAS Schedule for our Coventry laboratory. Click here to download our latest Waste Water brochure.

If you have any queries about this, or any other analytical offering, please contact us or call 02476 421213.

Contact Us

ALS Environmental

Torrington Avenue



T:  024 7642 1213

or :

Units 7 & 8

Hawarden Business Park

Manor Road








We had potential water quality problem due to the actions of a third party and needed samples taken as a matter of urgency. Although this was outside the strict terms of our contract with ALS they were able to provide a sampler on a Friday afternoon, get the samples taken and returned to their labs for analysis.

They backed this excellent performance up by emailing us the sample results over the weekend. All in all a great piece of customer service!

Bob Windmill, Head of Water Quality, Independent Water Networks

ALS are a really easy company to deal with their professional attitude to the range of services they provide for us is second to none. The people there listen carefully and respond very quickly to our requests , we have dealt with them for the last eight years and their customer advisors understand our business and not only their own.”

Ken Begg, Director, Aberdeen Sampling Ltd
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