溶解性有机质对铁铝土吸附2,4-D的影响

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Abstract In this study,the sorption kinetics and isotherms of 2,4-dichlorophenoxyacetic acid (2,4-D) in three ferralsols were investigated,and the effect of dissolved organic matters (DOMs) was compared.The results showed that the sorption kinetics of 2,4-D in ferralsols followed Pseudo first-order equation,and the isotherm data were fitted well by Henry and Freundlich model,indicated that 2,4-D sorption on the ferralsols was an spontaneous,exothermic and anisotropic process dominated by physical forces.The value of K_d for 2,4-D ranged from 0.61 to 2.02 L/kg,implying that 2,4-D was difficult to be sorbed by the soils,which could result environmental risk to the groundwater.The sorption of 2,4-D in the ferralsol was significantly affected by the soil pH values,and was also closely related to the content of mineral and clay.Moreover,in the presence of dissolved organic matter,DOM with high hydrophobicity (CC) and DOM with medium hydrophobicity (SPd) inhibited 2,4-D sorption on the three ferralsols,causing the K_d values decreased by 10.7%~58.8%.Conversely,there was no significant effect by DOM with low hydrophobicity (RS).The influence of DOM on the sorption of 2,4-D in ferralsols were closely associated with both characteristics of DOM and soil.The effect of soil pore blocking increased with the increase of the soil mineral components and the clay contents.Meanwhile,with the increase of the hydrophobicity of DOM,the effect of solubility enhancement and pore blocking increased,which decreased the 2,4-D sorption in the ferralsols.The hydrophobiv acid fraction (HOA) and hydrophobic neutral fraction (HON) were the key fractions for this process.

Key words： 2,4-dichlorophenoxyacetic acid ferralsol dissolved organic matter sorption

Received: 25 August 2017

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	Articles by authors
	WU Dong-ming
	REN Chang-qi
	LI Qin-fen
	WU Chun-yuan
	LI Wei

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WU Dong-ming,REN Chang-qi,LI Qin-fen等. Influence of dissolved organic matter on sorption of 2, 4-dichlorophenoxyacetic acid in ferralsol[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 1090-1098.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/1090

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