One spectrum transformation

Before considering more advanced qualitative tests, i.e. those based on the use of the derivative signals, it can be interesting to present a simple transformation leading to the visualisation of the UV response. 

Absorbance values Code Coloured scale BOD5 (mg/L) COD (mg/L) TSS (mg/L) Nitrates (mg/L) Example 

5 X2 0.2 X3 0.05 1 Blue 10 20 20 1 Natural water without organic matter nor nitrate or treated and denitrified wastewater 

5 X2 0.2 X3 0.05 2 Green 10 20 20 10 Natural water with nitrate or efficient biological wastewater treatment plant outlet 

This coloured scale can be compared to codification systems for water quality mapping. 

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