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A UKAS ISO 17025 accredited method to determine pH, using a meter in the range of pH 4 to pH 12.45 The pH scale gives a measure of acidity or alkalinity at a specified temperature (20ºC or 25ºC). Sample types tested are final effluent This method complies with BS EN ISO 10523.

A UKAS ISO 17025 accredited method to determine suspended solids present final effluent by filtration through glass fibre filters. The lower limit of the determination is about 2mg/l. No upper limit has been established. Water samples are not always stable which means that the content of suspended solids depends on storage time, means of transportation, pH value and other circumstances. Results obtained with unstable samples need to be treated with caution. Floating oil and other immiscible organic liquids will interfere (see EN 872, Annex A). This method complies with EN 872.

A UKAS ISO 17025 accredited method to determine Chemical Oxygen Demand (COD). COD is the mass concentration of oxygen equivalent to the amount of dichromate consumed by dissolved and suspended matter when a water sample is treated with that oxidant under defined conditions. It is expressed in mass of oxygen consumed over a volume of solution in mg/l.

A UKAS ISO 17025 accredited method to determine total oil in effluent using a FTIR instrument. The effluent is extracted with solvent then treated to remove non-hydrocarbon compounds and analysed for hydrocarbon content by infrared absorption of C-H stretching vibrations.