UV Estimation of BOD, COD and TOC

The estimation of the main aggregated organic parameters for water and wastewater is one of the first applications of UV spectrophotometry. As a lot of organic compounds absorb in the UV region (see Chapter 3), the exploitation of UV spectrum for a quick 

Multiwavelengths exploitation tor semi-deterministic deconvolution and calculation ot COD, BOD, TOC. 

The first way is very simple as it is the research of a useful correlation between one wavelength absorbance measurement and the corresponding parameter value. This simple absorptiometry has been carried out, without actual success, from the use of a low-pressure mercury lamp emitting principally at 254 nm [8-11]. This method was proposed more for economic than scientific reasons, (cheap UV light source). The use of a second wavelength (in the visible range) for interference compensation (due to suspended solids) does not improve the quality of results. 

---