Correlation between membrane interface probe response and total petroleum hydrocarbons in soils

• Main Authors: Su, Hsiang-Ning, 蘇香寧
• Other Authors: Yeh, Kuei-Jyum
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/13308194423328921544

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 98 === Because of the heterogeneous subsurface characteristics, it is a challenge to determinate and evaluate the distribution of contamination of a site based on its surface and historical data. The direct push technology has been developed and applied on the subsurface sampling of contaminated sites. Membrane Interface Probe (MIP) is used to aid the direct push technology to on-line evaluate the extent of contamination, and to screen the soil samples required for further laboratory analyses. When the MIP is push into the subsurface, the MIP heats the soils and allows volatile organic vapor in the subsurface to go through a semi-permeable membrane on MIP, while water and air are rejected. The organic vapor is then transported to a GC aboveground and the concentrations gradient of VOCs along the depth of sampling points are recorded. The variation in VOC concentrations, geology characteristics and moisture of contaminated soils might cause the error of MIP signal. This study collected MIP signals and concentrations of petroleum hydrocarbons (TPHs) in soils of 8 contaminated sites conducted by 3 consultancies. The purpose of this study is to evaluate the relations of MIP signal and TPH concentrations in order to help the application of MIP technology on site investigation. The result showed each site has its different linear MIP-TPH relation. The linear relations of sites A1, A2, A3 and B1 are positive; however, those of A4, C1, C2 and C3 are insignificant. Because sites A1, A2, A3 and B1 were contaminated by gasoline, high sulfur diesel oil and aviation gasoline; it was concluded that MIP is appropriate for these types of contaminants. Based on the company A’s data, a linear MIP-TPH correlation with sands containing lower concentration of TPH (<10,000 ppm) was developed. A similar correlation was also found from soil samples collected by company C. It also appears that when the soil moisture was higher than 20%, higher MIP signal were obtained for the same TPH range.