抄録
A method for determining concentrations of 12 volatile organic pollutants which were added newly to the environmental standard for soil in Japan has been developed. By many conventional extraction methods for determining the pollutants, they could not be extracted completely from actual polluted soil samples.
In this study, it was found that concentrations of the pollutants in soil could be determined accurately and simply by the following procedures and conditions: (1) Put c.a. 5g of soil in a weighed centrifuge tube to which 10ml of ethanol has been added. (2) Weigh it to determine the accurate weight of the soil. (3) Shake vertically the centrifuge tube for 20min. (4) Leave the centrifuge tube for 48h to extract completely. (5) Shake hard for c.a. 20s after adding 20ml of pure water and 3-10ml of n-hexane for determination of MC, TCE, PCE and CCl4, with ECD-GC or n-decane for simultaneous determination of all the pollutants. (6) After centrifuge, take 2-5ml of n-hexane layer or n-decane layer by glass syringe, and pass it through a cartridge filled up 0.3ml of silica for clean up. At this time, throw away from 0ml to 0.5ml of effluent and collect from 0.5ml to 4ml of it. (7) Analyze with ECD-GC or GC/MS.
