| 摘要 |
<P>PROBLEM TO BE SOLVED: To analyze oil content such as machine oil contained in soil by using a simple procedure without any environmental pollution. <P>SOLUTION: A soil sample is mixed with water-soluble lower alcohol such as ethanol so as to dissolve oil content contained in soil in the lower alcohol. Then the mixture thus obtained is subjected to filtration to give filtrate. To the filtrate thus obtained hydrogen carbonate of alkali metal or alkali earth metal, water and an acidic adjuvant are added, thereby chemically generating carbon dioxide gas from the lower alcohol-water mixture, and then chemical and physical agitation of the whole mixture is performed to promote uniform separation of oil particles in the solution. A scattering state of the oil particles thus precipitated is measured by using a light transmission photometer to analyze oil content. <P>COPYRIGHT: (C)2012,JPO&INPIT |
