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物探与化探  2020, Vol. 44 Issue (2): 350-355    DOI: 10.11720/wtyht.2020.1334
  方法研究·信息处理·仪器研制 本期目录 | 过刊浏览 | 高级检索 |
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
王冀艳1, 储彬彬2, 姚文生3,4, 詹秀春2, 刘勉1
1. 河南省岩石矿物测试中心,河南 郑州 450012
2. 国家地质实验测试中心,北京 100037
3. 中国地质科学院 地球物理地球化学勘察研究所,河北 廊坊 065000
4. 联合国教科文全球尺度地球化学国际研究中心,河北 廊坊 065000
A study of the kinetic model of leaching mobile forms of elements in soils by the total reflection X-ray fluorescence spectrometry
Ji-Yan WANG1, Bin-Bin CHU2, Wen-Sheng YAO3,4, Xiu-Chun ZHAN2, Mian LIU1
1. Henan Rock and Mineral Testing Center, Zhengzhou 450012, China
2. National Research Center for Geoanalysis, Beijing 100037, China
3. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
4. UNESCO Global Scale Geochemistry International Research Center, Langfang 065000, China
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摘要 

活动态提取技术是深穿透地球化学研究隐伏矿的有效手段之一。提取时间是活动态提取技术的一个关键因子,由于提取剂与目标元素、赋存矿物的作用方式不同,提取时间对提取效果的影响会不同。本研究采用全反射X射线荧光光谱法(TXRF)测定土壤中Cu、Pb、Zn、Ni、Mn活动态提取量随提取时间的变化。结果表明,在1 h内,分析元素提取量随提取时间急速增长,在7 h内提取量增长速率较高,分析元素提取量基本在24 h达到平衡。对各元素的提取过程建立了两点动力学模型wt=w1exp(-k1t)+w2exp(-k2t),模拟提取土壤中两种吸附形式的活动态元素,方程中k1代表非专性吸附活动态(如离子态、静电吸附、以纳微颗粒形式存在)的提取速率常数,提取速率较快,k2代表专性吸附的活动态(粘土吸附态、铁锰氧化物弱结合或有机络合态)的提取速率常数,提取速率相对较慢。

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王冀艳
储彬彬
姚文生
詹秀春
刘勉
关键词 全反射X射线荧光光谱法(TXRF)活动态提取土壤提取时间动力学模型    
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 wt = 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 wordstotal reflection X-ray fluorescence spectrometry (TXRF)    leaching mobile forms of elements    soil    leaching time    kinetic model
收稿日期: 2019-06-22      出版日期: 2020-04-22
ZTFLH:  P632  
基金资助:国家重点研发计划项目(2016YFC0600603)
作者简介: 王冀艳(1983-),女,硕士,高级工程师,主要从事无机元素分析研究工作。Email: 94396436@qq.com
引用本文:   
王冀艳, 储彬彬, 姚文生, 詹秀春, 刘勉. 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[J]. 物探与化探, 2020, 44(2): 350-355.
Ji-Yan WANG, Bin-Bin CHU, Wen-Sheng YAO, Xiu-Chun ZHAN, Mian LIU. A study of the kinetic model of leaching mobile forms of elements in soils by the total reflection X-ray fluorescence spectrometry. Geophysical and Geochemical Exploration, 2020, 44(2): 350-355.
链接本文:  
http://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.1334      或      http://www.wutanyuhuatan.com/CN/Y2020/V44/I2/350
Fig.1  不同提取时间对Cu提取量的影响
Fig.2  不同提取时间对Pb提取量的影响
Fig.3  不同提取时间对Zn提取量的影响
Fig.4  不同提取时间对Ni提取量的影响
Fig.5  不同提取时间对Mn提取量的影响
提取元素 实验样品 w0/
10-6
w1/
10-6
k1/h-1 w2 /
10-6
k2/h-1 R2
ASA-2a 3.461 2.284 4.891 1.177 0.1395 0.986
Cu ASA-3a 4.378 3.211 23.49 1.168 0.2344 0.984
ASA-6a 20.24 15.83 5.666 4.408 0.0973 0.996
ASA-2a 7.973 3.497 2.997 4.469 0.0499 0.972
Pb ASA-3a 8.23 3.564 22.57 4.666 0.1062 0.989
ASA-6a 28.03 17.51 4.197 10.51 0.1021 0.995
ASA-2a 3.334 2.361 3.869 0.979 0.127 0.992
Zn ASA-3a 7.046 3.892 4.570 3.153 0.0941 0.992
ASA-6a 6.845 3.687 2.592 3.145 0.0480 0.993
ASA-2a 1.368 0.4976 1.319 0.8565 0.0350 0.977
Ni ASA-3a 2.188 0.5907 4.635 1.597 0.0511 0.985
ASA-6a 1.762 0.7944 2.477 0.9611 0.0180 0.975
ASA-2a 147.3 25.02 1.957 121.8 0.0660 0.993
Mn ASA-3a 300.5 63.98 42.44 236.5 0.0661 0.983
ASA-6a 269.3 78.03 54.78 191.3 0.1763 0.987
Table 1  元素活动态提取过程动力学模拟参数
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