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Speciation of selenium in the selenium-rich cultivated land in Linhe District, Bayannur City, Inner Mongolia and its influencing factors |
LI Shi-Bao1,2( ), YANG Li-Guo1,2, XIONG Wan-Li1,2, MA Zhi-Chao1,2, YUAN Hong-Wei1,2, DUAN Ji-Xue1,2 |
1. Geological Survey Institute of Inner Mongolia, Hohhot 010020, China 2. Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot 010020, China |
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Abstract This study investigated the speciation of selenium in 51 surface soil samples from the selenium-rich cultivated land in Linhe District, Bayannur City, Inner Mongolia and explored the content and speciation of selenium and their influencing factors. The results showed that the surface soil in the study area had total selenium content of (0.19~0.48)×10-6, averaging 0.33×10-6, indicating a soil environment with moderate-high selenium content. Among the seven forms of selenium speciation, major forms include the residue, humic acid bound, and strong organic bound forms. The remaining forms, namely water-soluble, ion exchange, iron-manganese oxide bound, and carbonate bound forms accounted for only 13.67%. Water-soluble selenium consisted mainly of moderate-high water-soluble selenium (92.16%), with the absence of water-soluble selenium deficiency. The selenium content in each form was highly correlated with the total selenium content in the soil. The organic matter content, pH, Eh, and CEC had different effects on the distribution characteristics of selenium speciation.
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Received: 11 January 2022
Published: 27 April 2023
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Traffic location (a) and topsoil sample distribution (b) in the study area
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指标 | 分析方法 | 要求检出限 | 检出限 | 单位 | 准确度合格率 | 精密度合格率 | 水溶态 | ICP-MS | 0.0050 | 0.0050 | 10-6 | 100% | 100% | 离子交换态 | ICP-MS | 0.0100 | 0.0096 | 10-6 | 100% | 100% | 碳酸盐结合态 | ICP-MS | 0.0050 | 0.0048 | 10-6 | 100% | 100% | 铁锰结合态 | ICP-MS | 0.0100 | 0.0099 | 10-6 | 100% | 100% | 强有机结合态 | ICP-MS | 0.0050 | 0.0046 | 10-6 | 100% | 100% | 腐植酸结合态 | ICP-MS | 0.0050 | 0.0049 | 10-6 | 100% | 100% | 残渣态 | ICP-MS | 0.0100 | 0.0100 | 10-6 | 100% | 100% | 全量Se | HG-AFS | 0.01 | 0.01 | 10-6 | 100% | 100% | Corg. | VOL | 0.10 | 0.05 | % | 100% | 100% | 氧化还原电位 | 电位法 | 0.10 | 0.05 | mV | 100% | 100% | CEC | VOL | 0.25 | 0.25 | cmol/kg | 100% | 100% | pH | ISE | 0.10 | 0.10 | 无量纲 | 100% | 100% |
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Accuracy and precision for analysis method of various indicators
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统计指标 | 平均值 | 变化范围 | 中位数 | 占比 | 10-6 | 10-6 | 10-6 | % | 总硒含量 | 0.330 | 0.190~0.480 | 0.330 | 100.00 | 水溶态 | 0.010 | 0.005~0.024 | 0.010 | 3.24 | 离子交换态 | 0.018 | 0.004~0.041 | 0.017 | 5.51 | 碳酸盐结合态 | 0.011 | 0.005~0.017 | 0.011 | 3.32 | 铁锰结合态 | 0.005 | 0.002~0.013 | 0.005 | 1.60 | 强有机结合态 | 0.061 | 0.020~0.120 | 0.056 | 18.54 | 腐植酸结合态 | 0.077 | 0.046~0.130 | 0.072 | 23.41 | 残渣态 | 0.097 | 0.066~0.170 | 0.093 | 29.63 |
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Statistical characteristics of soil selenium speciation in the study area
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Evaluation results of water-soluble selenium classification in the study area
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土壤类型 | 样点数 | 总硒含量 | 残渣态 | 腐植酸 结合态 | 离子 交换态 | 强有机 结合态 | 水溶态 | 碳酸盐 结合态 | 铁锰氧化物 结合态 | 潮灌淤土 | 28 | 0.341 | 0.103 | 0.0785 | 0.0182 | 0.0644 | 0.0100 | 0.0109 | 0.0054 | 盐化灌淤土 | 23 | 0.315 | 0.091 | 0.0754 | 0.0181 | 0.0570 | 0.0114 | 0.0110 | 0.0051 |
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Average contents of selenium forms of different soil types in the study area10-6
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土壤类型 | 有机质 | 阳离子交换量 | pH值 | 氧化还原电位 | % | cmol·kg-1 | mV | 潮灌淤土 | 1.57 | 12.65 | 8.40 | 264 | 盐化灌淤土 | 1.33 | 11.54 | 8.57 | 267 |
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The basic properties of tidal irrigation and salinization irrigation in the study area
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指标 | 总硒 | 残渣态硒 | 腐植酸 结合态硒 | 离子交 换态硒 | 强有机 结合态硒 | 水溶态硒 | 碳酸盐 结合态硒 | 铁锰氧化 物结合态硒 | 总硒 | 1 | 0.699** | 0.697** | 0.675** | 0.751** | 0.303* | 0.673** | 0.147 | 有机质 | 0.527** | 0.306* | 0.515** | -0.094 | 0.537** | -0.217 | 0.149 | 0.046 | pH | -0.328* | -0.110 | -0.261 | -0.115 | -0.385** | 0.563** | -0.216 | -0.209 | 氧化还原电位 | 0.093 | -0.082 | 0.151 | 0.045 | 0.126 | -0.194 | 0.114 | 0.025 | 阳离子交换量 | 0.460** | 0.199 | 0.395** | -0.125 | 0.589** | -0.290* | 0.151 | 0.246 |
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Relationship between total selenium and various forms of selenium and physical and chemical properties in the study area
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Correlation between some selenium forms and totle selenium content in the study area
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Correlation between organic matter and total selenium content and some selenium forms in the study area
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Correlation between pH and total seleniumcontent and some selenium forms in the study area
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Correlation between Eh and water-soluble state selenium in the study area
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Eh-pH of selenium at 25 ℃ and 1 atm pressure
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Correlation between CEC and total selenium and water-soluble state selenium in the study area
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