What wavelength will give maximum absorbance (optical density ) of pure TNT solution on spectriphotometer?

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Matteo Miceli

A quick search on Reaxys gave these two references:

Journal of the Chemical Society, 1959 , p. 3273,3274

Helvetica Chimica Acta, 1943 , vol. 26, p. 121,124

The first one reports a maximum absorption at 238.5 nm. However, I strongly recommend to first take a full absorption spectrum yourself, and only then proceed to quantify with single wavelength.

Tim Strutt

A classic colorimetric method for the measurement of TNT in wastewater uses a reaction with potassium hydroxide and sodium sulfite to form a red coloured Janowsky complex. DNT forms a blue complex. The colours can fade, so the measurement needs to be done within a few minutes.

R.Girijan Menon

Please take a full scan of the sample over the entire range of uv-vis from 190 nm to 800 nm. Since TNT contains an aromatic ring, definitely it will have absorption in the UV region, may be between 220 and 260 nm region.