土壤因子对三氯乙烯土-气分配系数的影响

摘要:
土壤-空气(简称土-气)分配是影响挥发性有机污染物环境归宿的重要环节，是形成呼吸暴露风险的重要过程。以黄土、红土、黑土和砂土4种典型土壤为研究对象，识别了影响三氯乙烯土-气分配的土壤因子，并通过单因素控制批实验定量探究了三氯乙烯在土-气界面的分配行为，构建了三氯乙烯土-气分配系数与土壤因子的定量关系。结果表明，4种典型土壤原样的三氯乙烯土-气分配系数存在显著差异(黑土>红土>砂土>黄土)，黑土分配系数的影响因子主要是土壤粒径、含水率、有机质含量，其他3种土壤分配系数的影响因子主要是土壤粒径、含水率。黑土中三氯乙烯的土-气分配系数(K_SA)与土壤影响因子的关系可定量表示为：K_SA=-0.744X₁-0.224X₂+0.704X₃; 而在砂土中为：K_SA=-0.724X₁-0.222X₂；在黄土中为：K_SA=-0.291X₁-0.268X₂；在红土中为：K_SA=-0.589X₁-0.338X₂(X₁为土壤含水率；X₂为粒径；X₃为有机质含量)。研究成果有利于深入认识三氯乙烯在我国典型土壤中土-气界面上的分配行为及土壤因子对其产生影响的规律，为土-气分配过程中多因素耦合影响量化和健康风险评估提供理论依据。
- 土-气分配 /
- 三氯乙烯 /
- 界面分配 /
- 土壤因子 /
- 多元回归
Abstract: Objective
Soil-air partitioning is a critical process influencing the environmental fate of volatile organic pollutants and a significant contributor to the risk of respiratory exposure.
Methods
Four typical soils-loess, red soil, black soil and sand were used to identify the soil factors affecting the partitioning of trichloroethylene. The partitioning behaviour of trichloroethylene at the soil-atmosphere interface was quantitatively investigated by single-factor controlled batch experiments, and the quantitative relationship between the trichloroethylene soil gas partition coefficient and soil factors was determined.
Results
The results showed significant differences in the soil-gas partition coefficients of the four typical soils (black soil>red soil>sandy soil>loess soil). The main influencing factors for the partition coefficient of black soil were primarily particle size, water content, and organic matter content. Whereas, for the other three soils, the main factors were particle size and water content.
Conclusion
The relationships between the soil gas partition coefficient of TCE and soil factors in black soil can be quantitatively expressed as follows: K_SA=-0.744X₁-0.224X₂+0.704X₃; sand: K_SA=-0.724X₁-0.222X₂; loess: K_SA=-0.291X₁-0.268X₂; and red soil: K_SA=-0.589X₁-0.338X₂ (X₁: water content; X₂: particle size; X₃: organic matter content). These research aids in a deeper understanding of the distribution behaviour of trichloroethylene at the soil-atmosphere interface in typical soils in China and the influence of soil factors and provide a theoretical basis for the quantification of multifactor coupling effects and health risk assessment in the process of soil gas partitioning.
- soil-gas partition /
- trichloroethylene /
- interface soil-gas partition /
- soil factor /
- multiple regression
注释:

所有作者声明不存在利益冲突。

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图 1 实验反应装置示意图

Figure 1. Schematic diagram of experimental reaction device

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图 2 TCE吸附动力学曲线

Figure 2. Adsorption kinetic curve of TCE

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图 3 典型土壤的TCE土-气分配系数(K_SA)

Figure 3. Soil-gas partition coefficient (K_SA) of TCE in typical soil

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图 4 土壤粒径(a)、含水率(b)与TCE土-气分配系数的关系

Figure 4. Relationship between soil particle size(a), moisture(b) and soil-gas partition coefficient of TCE

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图 5 黑土K_SA与有机质含量的关系及拟合曲线图

Figure 5. Relationship between the soil-gas partition coefficient of TCE the organic matter content of black soil and the fitting curve

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表 1 土壤物理化学指标

Table 1. Physical and chemical indicators of soil

土壤物理化学性质指标		黄土	砂土	红土	黑土
有机质w_B/%		0.016 5	0.396	0.155	18.354
土壤最大持水能力/%		44.8	41.0	52.5	130.1
平均粒度/μm		19.04	8.61	8.69	36.96
BET比表面积/(m²·g^-1)		19.10	11.38	45.27	1.72
矿物种类和质量分数/%	蒙脱石	—	1.20	2.65	—
	伊利石	6.90	17.20	4.95	14.20
	角闪石	0.80	1.20	—	—
	高岭石	—	—	4.35	—
	绿泥石	12.10	11.05	—	8.50
	石英	38.30	43.55	39.90	41.90
	钾长石	3.65	3.35	0.80	3.10
	斜长石	16.00	21.00	2.80	32.30
	方解石	21.40	1.45	—	—
	三水铝石	—	—	29.25	—
	锐钛矿	—	—	1.40	—
	白云石	0.85	—	—	—
	赤铁矿	—	—	13.90	—
注：表中“—”表示未检出

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