粒径对土壤石油烃荧光特性影响及校正方法研究

Effect of Soil Particle Size on Fluorescence Characteristics of Petroleum Hydrocarbons and Correction Methods

采用紫外诱导荧光技术对土壤中石油烃污染物进行检测时,不同粒径土壤会对测量带来较大误差,为了消除土壤粒径(soil particle size,PS)对测量带来的影响,配制3种不同粒径的常见的土壤石油烃污染物(土壤原油、土壤柴油、土壤汽油)样本,搭建紫外诱导荧光检测系统,研究了不同粒径下各类土壤石油烃污染物的荧光特性,构建了土壤石油烃粒径校正方法。结果表明,对于土壤原油、土壤柴油和土壤汽油样本,当样本浓度为4、4和10 g·kg^(-1)时,各类型土壤油类样本的荧光信号与粒径具有良好的线性相关性,相关系数R^(2)分别达到了0.9989、0.9686和0.9045。通过土壤颗粒物吸附模型,对实验结果进行解释分析,建立土壤粒径校正方法,对各类型土壤石油烃样本在不同粒径下的荧光信号进行校正;粒径校正前后3种类型的土壤石油烃荧光强度与浓度的相关系数R^(2)分别由校正前的0.3265、0.0047、0.3298上升到校正后的0.9838、0.9832、0.9533,浓度反演的相对误差(RE)分别为11.02%、5.71%、10.19%。建立的土壤粒径校正方法可以有效地降低土壤粒径对土壤石油烃类污染物荧光强度的影响,为采用紫外诱导荧光技术快速、原位、准确的检测土壤石油烃类污染物提供了理论依据和技术支持。

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 R^(2)reached 0.9989,0.9686,and 0.9045,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 R^(2) of fluorescence intensity and concentration of petroleum hydrocarbons in three types of soil increased from 0.3265,0.0047,and 0.3298 before correction to 0.9838,0.9832,and 0.9533 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.