When using UV-induced fluorescence technology to detect petroleum hydrocarbon pollutants in soil,soil with different particle sizes will cause large errors in the measurement.To eliminate the influence of Soil particle size(PS)on the measurement,Three common soil petroleum hydrocarbon pollutants(soil crude oil,soil diesel oil,and soil gasoline)with different particle sizes of soil samples were prepared.Through the establishment of a UV-induced fluorescence detection system,the fluorescence characteristics of various soil petroleum hydrocarbon pollutants under different particle sizes were studied,and the correction method of soil petroleum hydrocarbon particle sizes was established.The results showed that for soil crude oil,soil diesel oil,and soil gasoline samples when the sample concentration was 4,4 and 10 g·kg-1,the fluorescence signal of each type of soil oil sample had a good linear correlation with particle size.The correlation coefficients R2 reached 0.998 9,0.968 6,and 0.904 5,respectively.The experimental results were interpreted and analyzed through the adsorption model of soil particulate matter.The soil particle size correction method was established to correct the fluorescence signals of petroleum hydrocarbon samples of different soil types under different particle sizes.Before and after particle size correction,the correlation coefficients R2 of fluorescence intensity and concentration of petroleum hydrocarbons in three types of soil increased from 0.326 5,0.004 7,and 0.329 8 before correction to 0.983 8,0.983 2,and 0.953 3 after correction,respectively.RE)were 11.02％,5.71％,and 10.19％,respectively.The proposed correction method can effectively reduce the influence of soil particle size on the fluorescence intensity of petroleum hydrocarbon pollutants in soil and provides the theoretical basis and technical support for the rapid,in-situ,and accurate detection of petroleum hydrocarbon pollutants in soil by UV-induced fluorescence technology.
SoilPetroleum hydrocarbonUltraviolet induced fluorescenceSoil particle sizeMethod of correction
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