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Whether you want to check the carbon content of waste water or keep an eye on the salt content of your process water, when it comes to water analysis, HACH LANGE is the perfect choice. We have years of experience in water analysis and offer a broad range of services.Our company history dates back to Berlin 1933, when Dr. Bruno Lange set up a company in his own name employing six people. Inventions such as the photometer and later on cuvette tests have revolutionised the field of analysis, making it possible to conduct extensive analyses without the need for in-depth knowledge of chemistry.HACH LANGE was born in 2004 when Dr. Bruno Lange joined forces with HACH, an American company specialising in electro and photochemistry. The expertise of these two companies is now combined, benefitting you, our customers!That's not all, our company is continuing to grow and already has 22 subsidiaries around the world, including branches across Europe, China and the USA.


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United Utilities choose Hach for COD water tests

Hach Lange are delighted to have been chosen by United Utilities as its supplier of COD tubes for testing water samples. The contract takes the form of a 2 to 3 year Framework Agreement, in which Hach Lange expect to supply approximately 100,000 tubes per year. This, the company believes is the largest COD contract in the UK.

The Hach COD tubes were chosen following an evaluation of tubes from four different suppliers. Bob Capron, United Utilities' laboratory team leader for wastewater, managed the evaluation, and commented that "the decision was taken on the grounds of accuracy, measurement range, price and quality of service and delivery."

COD stands for Chemical Oxygen Demand. It is a measure of organic pollution in wastewater, and is the most frequently mentioned parameter in European legislation. The Hach COD test follows the ISO 15705 standard method exactly, with all reagents supplied ready-to-use, in precisely the correct amounts in a small cuvette.

To perform a test, users simply add a water sample to a cuvette and leave it in a heater for 2 hours. At the end of this period the intensity of colour in the solution is directly related to the COD value in the sample, and can be measured quickly and easily. The United Utilities laboratory in Lingley Mere, Warrington, uses four of Hach Lange's highly accurate DR 4000 spectrophotometers to test the cuvettes, and it also runs two of Hach Lange's Ganimede Phosphate analysers, so the staff were already familiar with the quality of the Hach Lange products and service.

Following the Framework Agreement with United Utilities, Hach Lange estimate that they now supply around 90% of the COD tubes used by the UK's major water companies.

For further information please email HACH LANGE LTD

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