Discussion
What is a solvent's cut-off wavelength?
Answer: D
Every solvent absorbs strongly below some wavelength, and beneath that cut-off too little light reaches the detector for a useful measurement whatever the blank correction. Solubility, refractive index and fluorescence are separate considerations. Water and acetonitrile reach below 200 nanometres while acetone is useless below about 330, so the solvent has to be chosen against the band to be measured rather than for convenience alone. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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