| Summary: | 碩士 === 國立屏東技術學院 === 環境工程技術研究所 === 84 === This study intends to develop an on-site portable petroleum
hydrocarbon''s analysis system. Because of volatility and
decomposition characteristic of pollutants during sample
transportation and storage, it is difficult to obtain accurate
composition of contaminants. Therefore, a rapid, accurate and
economical on-site analysis system would help to delineate the
palution plume on a contaminated site. The principle of the
system is to desorb the pollutants from the liquid and solid
phases of soil matrix to the headspace by heating, and then the
compounds can be quantified by an OVA or GC/FID. Therefore, this
system can be operate and analyze the organic contaminations of
soil on site. The results show that the optimum
analysis conditions of the system are as followed：heating
temperature is 60℃；heating power is 200W；heating time is 10
minute； soil weight is 50 gram, and volume of heating vessel is
500 ml. The applied range of concentration is from 500 to 10000
ppm. The percentage of recovery is 65％ for total petroleum
hydrocarbons, 60％ for benzene, toluene,ethylbenzene and xylene.
If soil moisture is too dry or too moist (18%), the recovery
rate of TPH and BTEX will be decreased. Soil texture is also an
important factor. For example, the recovery rate of TPH from
sand is 66%, but clay is only 41% in the dry environment. The
recovery will be better if that the soil sample is mixed during
heating and soil organic matter content is less.
|
|---|
