利用全反射X射线荧光光谱法研究土壤中活动态元素提取动力学

doi:10.11720/wtyht.2020.1334

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Abstract

The leaching of elements of mobile forms is one of the effective techniques in deep penetrating geochemistry in search of concealed deposits. The leaching time as an important factor has a great effect on the leaching results because of the different action modes of extractant, target elements and minerals. The total reflection X-ray fluorescence spectrometry (TXRF) was used to determine the change of the leaching amount of mobile forms of Cu, Pb, Zn, Ni and Mn with the leaching time. The results showed that the leaching amount of analytical elements increased rapidly within 1 hour, increased at a high rate within 7 hour and reached a balance at 24 h. The nonlinear kinetic model of w_t = w₁ exp(-k₁t) + w₂ exp(-k₂t) was established to simulate the leaching course for mobile forms of elements adsorbed by two forms in soils. In the equation, k₁ which is relatively fast represents the leaching rate of the non-obligate adsorption of mobile forms of elements such as ion form, electrostatic adsorption form, and existence in the form of nanoscale metal particles, while k₂ which is relatively slow represents the leaching of the obligate adsorption of mobile forms of element, such as clay adsorption form, weak binding form of iron and manganese oxide or organically bound form.The kinetic model further provides a basis for exploring the leaching mechanism of mobile forms of elements.

Key words： total reflection X-ray fluorescence spectrometry (TXRF) leaching mobile forms of elements soil leaching time kinetic model

Received: 22 June 2019 Published: 22 April 2020

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	Articles by authors
	Ji-Yan WANG
	Bin-Bin CHU
	Wen-Sheng YAO
	Xiu-Chun ZHAN
	Mian LIU

Cite this article:

Ji-Yan WANG,Bin-Bin CHU,Wen-Sheng YAO, et al. A study of the kinetic model of leaching mobile forms of elements in soils by the total reflection X-ray fluorescence spectrometry[J]. Geophysical and Geochemical Exploration, 2020, 44(2): 350-355.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1334 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I2/350

Cu extraction effected by leaching times

Pb extraction effected by leaching times

Zn extraction effected by leaching times

Ni extraction effected by leaching times

Mn extraction effected by leaching times

Kinetics parameters of leaching courses of elements

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