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.
ANSWER: If you are using a pH 7 buffer solution to check pH using your DR/820, 850, 890, or Pocket Colorimeter and the reading is not close to what it should be, then make sure the buffer you are using is colorless (Cat.No. 12222-49 or 12222- 56) and not yellow.NSWER: The lower the temperature, the higher the impedance of pH glass. For every 10 C decrease in temperature, the glass impedance will increase about 2.5 times, resulting in slow response. For example, if the pH glass impedance is 100 MOhm at 25 C it will increase to 250 MOhm at 15 C.