How to measure the nicotine content?

Nicotine exists in two forms - bound, or saline, and free. In this volatile it is only in the free form, but the tobacco is present mainly in salt. On combustion nicotine passes into the free form and is absorbed into the body.
When the tobacco companies have realized this, they began to learn how you can increase the number of rolling in the free form of nicotine. It turned out that this is done quite simple - you just need to increase the alkalinity (pH) of tobacco smoke. This can be achieved by adding tobacco ammonium phosphate, ammonium and / or urea.
At one time, a sharp increase in sales of Marlborough called attention to other producers of tobacco. An analysis of Marlboro cigarettes, competitors came to the conclusion that "the technology of ammonia (or urea) was essentially the" spirit "Marlboro".
The note by the tobacco company R.Dzh.Reynolds said: "The method of ISO / FTC nicotine by definition can be misleading. Critical exponent is not the mass of nicotine, which enters the human body, and then, in any form is nicotine. The greater the ratio of a free and bound nicotine, the more bioavailable for absorption of nicotine.
The method of ISO / FTC measure the nicotine content only in the residue on the filter, but does not give information about the nicotine in the form of flying.
Therefore, printed on the pack levels of nicotine - a deliberate deception of the consumer of light cigarettes.