Effect of Soil Organic Matter on Adsorption and Desorption of Forchlorfenuron in Soil

doi:10.11924/j.issn.1000-6850.casb20191000755

Abstract

Abstract:

To explore the migration and transformation of forchlorfenuron in soil and the effect of organic matter on the process, the batch equilibrium experiments were used to investigate the adsorption and desorption of forchlorfenuron in two soils with different organic matter contents. The results showed that the adsorption kinetics could be well described by the pseudo-second order kinetics model, and the R²reached 0.9999. All adsorption and desorption isotherms were of deviation from the linear model, and all experimental data could be best described by the Freundlich model. Meanwhile, adsorption capacity in soil with high organic matter content was higher than that in soil with low organic matter content, but there was hysteresis in the desorption process. All the results showed that the adsorption of forchlorfenuron by organic matter was mainly in the presence of organic matter, while the adsorption of inorganic minerals was very weak. And organic matter could significantly increase the adsorption capacity of forchlorfenuron. However, the desorption process of forchlorfenuron in soil with high organic matter content had significant hysteresis behavior with hysteresis index of 0.6273, while the hysteresis index in soil with low organic matter had a negative value, which indicated that organic matter can enhance the immobilization of forchlorfenuron and reduce the risk of its migration and transformation.

Key words: forchlorfenuron, adsorption, desorption, organic matter, soil, migration and transformation

CLC Number:

X592

Pei Guangpeng, Zhu Yuen, Li Hua. Effect of Soil Organic Matter on Adsorption and Desorption of Forchlorfenuron in Soil[J]. Chinese Agricultural Science Bulletin, 2020, 36(32): 88-94.

Figures/Tables 8

References 34

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供试土壤	pH值	有机质/(g/kg)	阳离子交换量/(cmol/kg)	速效钾/(mg/kg)	速效磷/(mg/kg)	全氮/(g/kg)
土壤A	8.56	2.74	20.65	115.24	6.91	0.15
土壤B	8.31	57.60	34.60	238.82	75.79	2.78

供试土壤	pH值	有机质/(g/kg)	阳离子交换量/(cmol/kg)	速效钾/(mg/kg)	速效磷/(mg/kg)	全氮/(g/kg)
土壤A	8.56	2.74	20.65	115.24	6.91	0.15
土壤B	8.31	57.60	34.60	238.82	75.79	2.78

拟一级动力学		拟二级动力学			颗粒内扩散			Elovich方程
K₁	R²	q_e	K₂	R²	K_p	c	R²	α	β	R²
0.0059	0.8831	69.3	10.10	0.9999	0.3583	61.59	0.5857	4.791×10¹⁴	0.5657	0.8504

拟一级动力学		拟二级动力学			颗粒内扩散			Elovich方程
K₁	R²	q_e	K₂	R²	K_p	c	R²	α	β	R²
0.0059	0.8831	69.3	10.10	0.9999	0.3583	61.59	0.5857	4.791×10¹⁴	0.5657	0.8504

	土壤类型	Freundlich模型			Langmuir模型			Linear模型
	土壤类型	K_f	1/n	R²	C₀/(mg/kg)	b	R²	K_p/(L/kg)	R²
吸附	土壤A	0.251	3.26	0.9671				12.51	0.7935
吸附	土壤B	71.37	0.68	0.9963	177.04	0.71	0.9872	59.74	0.9790
解吸	土壤A	7.57	0.29	0.9611				24.35	0.6972
解吸	土壤B	118.70	0.64	0.9871	152.41	2.12	0.9986	127.60	0.9330