Apparantly Nicotine adsorps onto glassware (and other materials) which makes it hard to quantify reliably with UV extinction. So far we have tried to add Ammonia and triethtylamine to the solvent, which didn't help. Also very low and very high pH did not make a difference...
It will not only adsorb onto glass but also onto plastic.
For UV-Vis measurement it should suffice to equilibrate it with solution and refill it with fresh solution for measurement. In addition to get the blank more correct you may take the cell with fresh solvent after this measurement.
Dear Colleagues: Smokers and those who does not start smoking yet:
The label on a pack of cigarettes reads: Nicotine 0.4 mg/cig; TAR : 4 mg/cig.
The ratio TAR/Nicotine is always close to 10. The above example
4.0 Tar/0.4 Nicotine and it is for weakest cigarettes. Very strong, young guys prefer (and/or sustain) cigarettes with high concentration of both of components i.e. : TAR and Nicotine.
Of course - both the components sediment on - everything, leaving a reddish thin film which is very difficult to remove. In other words: the smog of cigarettes is "surface addictive"
[I am not writing here about the Pleasure of Smoking. But My own strong opinion is that smokers are addicted to TAR rather to Nicotine].
With Best Regards, Leonid
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