Pollution monitoring in seawater can be achieved using UV absorbance to measure COD. 

Sea water monitoring of organic pollution is ideally carried out with real time sensors deployed on aurtarkic systems such as buoys.  By using a multi-parameter optical sensor measuring COD and turbidity, the effect of point sources of pollution can be determined.

In this case study, an s::can spectro::lyser with titanium housing was deployed on a buoy in a harbour to determine real time COD and turbidity levels. This gave the researchers a greater understanding of the local contributors to the pollution in the harbour. Automatic cleaning was provided via the low power rucksack cleaning mechanism.