Nicotine presence can be detected in the blood for a short period only (about 48 hours) . However, its metabolite, cotinine, can be detected up to about three weeks from the last use and the cut-off detection levels is 200 ng/ml.
Q: What is the purpose of toner? Our skin is happiest at a pH of 5.5. Toner balances the pH of your skin. If you are acne prone the skin is too acidic. So finding a slightly alkaline toner can help balance the acidic nature. If the skin is dry, it is too alkaline, so finding a toner that has a lower pH can bring it to a happy balance of 5.5. Toning 1 minute after cleansing allows all the beneficial molecules to absorb into the skin as it is still wet.
The scale is logarithmic, and runs from 0 to 14. A pH of 7 indicates a neutral solution, while lower pH is acidic and higher pH is alkaline. Because the scale is logarithmic, a pH of 5 is ten times more acidic than a pH of 6. What pH literally measures is the concentration of H+ ions in a solution. pH stands for the French pouvoir hydrogÃ¨ne, meaning hydrogen potential. pH is important for many things in biochemistry. Certain bodily fluids have a particular pH that aids their function, like highly acidic gastric acid.