Envirochem offers a large range of colourmetric testing. Chemical Oxygen Demand (COD) is a good initial indicator of how hazardous a liquid sample is. COD is the total measurement of all chemicals in the water that can be oxidised. It is similar to Biological Oxygen demand because it provides an index to assess the effect of discharged waste water on the environment. It is sometimes used instead of BOD because of its shorter test time.
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