UV Cutoff

[colinbm]

Thanks to @dabateman I have been looking at the UV Cutoff of different solvents & I found this useful tables....
 

UV Cutoff

Burdick & Jackson solvents are arranged in order of increasing UV cutoff, the wavelength at which the solvent absorbance in a 1 cm path length cell is equal to 1 AU (absorbance unit) using water in the reference cell.     UV Cutoff (nm) Acetonitrile UV 190 Pentane 190 Water 190 Hexane UV 195     Cyclopentane 198 Cyclohexane 200 Heptane 200 Isopropyl Alcohol 205     Methanol 205 Ethyl Alcohol 210 2-Methoxyethanol 210 Methyl t-Butyl Ether 210 n-Propyl Alcohol 210     Trifluoroacetic Acid 210 Tetrahydrofuran UV 212 n-Butyl Alcohol 215 1,4-Dioxane 215 Ethyl Ether 215     Iso-Octane 215 n-Butyl Chloride 220 Glyme 220 Isobutyl Alcohol 220 Propylene Carbonate 220     Ethylene Dichloride 228 1,1,2-Trichlorotrifluoroethane 231 Dichloromethane 233 Chloroform 245 n-Butyl Acetate 254     Ethyl Acetate 256 Dimethyl Acetamide 268 N,N-Dimethylformamide 268 Dimethyl Sulfoxide 268 Toluene 284     N-Methylpyrrolidone 285 Chlorobenzene 287 o-Xylene 288 o-Dichlorobenzene 295 1,2,4-Trichlorobenzene 308     Methyl Ethyl Ketone 329 Acetone 330 Methyl Isoamyl Ketone 330 Methyl n-Propyl Ketone 331 Methyl Isobutyl Ketone 334   It is from https://macro.lsu.edu/HowTo/solvents/UV Cutoff.htm Perhaps this could be a "sticky" & perhaps some more common materials can be added & in the near IR too ?

[ulf]

At 1 AU the liquid have absorbed 10% of the light compared to 10mm water.

That leaves 90% transmitted, ignoring the surface transmission losses.

That is barely visible with a naked eye! (if in VIS)

 

I wanted to know what the unit AU ment and searched for that.

 

Without knowing anything more about the subject I suspect that the cutoff slope steepness is not the same for all liquids.

 

Can someone please shed some light upon this?

 

[colinbm]

Another problem I have see in searching is Acetone is quoted from 280nm to 330nm ?

[dabateman]

National Institute of standards will let you search here:

https://webbook.nist.gov/chemistry/name-ser/

 

You can see the UV/vis spectrum if selected,  example acetone: 

https://webbook.nist.gov/cgi/cbook.cgi?Name=Acetone+&Units=SI&cUV=on