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Change in testing chemical oxygen demand

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article image The Tubetest -- practical and convenient.

PALINTEST has extended its range of Tubetest reagents for chemical oxygen demand (COD) with a new product, which provides interference suppression for even very high levels of chloride.

This adds to the company's COD range, providing a number of environmentally aware options that can now test everything from fresh water through to sea water without interference.

The Palintest Tubetest system offers a practical and convenient method of testing COD, vital for assessing the quality of effluents and wastewater prior to discharge.

The test predicts the oxygen requirement of effluent and is used for the monitoring and control of discharges, and for assessing treatment plant performance. However, the presence of chloride in the sample can interfere with the result.

Until now the Palintest COD range dealt with levels of chloride up to approximately 2000mg/L. Increasingly, samples containing higher levels of chloride are being encountered which require extra suppression capability.

The test is, therefore, now available with two different levels of mercuric sulphate for chloride suppression, as well as being available mercury free for general use.

The option of using the lower mercury test has been retained, as the new range should only be used if higher levels of mercury are specifically necessary.

This is the most environmentally aware approach and displays Palintest's commitment to minimising the use of toxic chemicals.

With the Palintest Tubetest system the reagents are supplied premixed and pre-dispensed into borosilicate glass test tubes, which reduces contact with potentially hazardous chemicals to a minimum.

The ranges are all carefully formulated for use with existing calibrations and instruments.

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