SOLID-PHASE MICROEXTRACTION DETERMINATION OF ALCOHOL USING PENCIL LEAD

In order to conquer the shortcomings of commercial SPME coatings: they can’t stand high temperature, are easy to drop off, the longevity of usage is short and they are too expensive, we used pencil lead as a new sorbent to analyze the alcohol in water. The linear range is 5× 10-6-2.5×10-8g/mL. The detection limit is 5×10-9g/mL. We also used this method to determine the concentration of alcohol in environment water. The recoveries are 107.5% and 97%. The RSD is 5.9%. Hence the pencil lead is a very good material for solid-phase microextraction (SPME).