Quantitative Analysis of Total Petroleum Hydrocarbons  in Soils: Comparison between Reflectance Spectroscopy and Solvent Extraction by 3 Certified Laboratories

<table>Average and maximum deviation from projected TPH.</table>

Applied and Environmental Soil Science

fig4

Figure 4

Figure 4: Quantitative Analysis of Total Petroleum Hydrocarbons  in Soils: Comparison between Reflectance Spectroscopy and Solvent Extraction by 3 Certified Laboratories 

Figure 4 | Quantitative Analysis of Total Petroleum Hydrocarbons  in Soils: Comparison between Reflectance Spectroscopy and Solvent Extraction by 3 Certified Laboratories 