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| Distributions of the total concentration, bioavailability, and speciation of selenium in soils in Luoyang City, Henan Province, China |
TIAN Qiang-Guo1( ), HOU Jin-Kai1, YANG Zai-Wei2,3, LI Li-Yuan2,3() |
1. Institute of Geology and Mineral Resources Survey, Henan Bureau of Geology and Mineral Development, Luoyang 471023, China
2. School of Environment and Natural Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China
3. Key Laboratory of Recycling and Eco-Treatment of Waste Biomass of Zhejiang Province, Hangzhou 310023, China |
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Abstract Targeting the selenium resource in soils of Luoyang City, Henan Province, this study analyzed the distribution of total selenium concentration under different geological settings, soil types, land use types, acidity and alkalinity, and organic matter. Furthermore, it determined the bioavailability and speciation distribution of selenium in the soils. The results indicate that: (1) The soils in Luoyang City have total selenium concentrations of (0.03~5.67)×10-6, with an average of 0.30×10-6, and the area of soils with moderate and rich selenium accounts for 94.73%; (2) The average selenium concentration is the highest in soils of the Jixian Yunmengshan formation and the lowest in soils of the Cambrian Xinji Formation; (3) The average total selenium concentration is the highest in lime concretion black soil and the lowest in paddy soil; (4) Regarding land use types, the average total selenium concentration is relatively high in soils of paddy land and woodland; (5) Soils with high acidity and high organic matter concentrations are favorable for selenium enrichment; (6) In terms of soil types, the average concentration of bioavailable selenium is the highest in fluvo-aquic soils and the lowest in red clays; (7) The average concentration of bioavailable selenium is higher in alkaline soils than in neutral and acidic soils; (8) Selenium in soils primarily occurs in residue, strong organic bound, and humic acidic bound forms, with the highest average concentration of bioavailable selenium occurring in alkaline soils and red clays. The selenium resource in the soils in Luoyang City has high utilization potential, and it is feasible to conduct targeted development and planning of the selenium-rich industry according to the distribution of total selenium concentration in the study area.
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Received: 25 September 2022
Published: 27 October 2023
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Corresponding Authors:
LI Li-Yuan
E-mail: 527013743@qq.com;llyuan@zust.edu.cn
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| 编号 | 形态 | 提取剂 | 操作步骤 | | F1 | 水溶态 | 蒸馏水 | 25 mL,摇匀,振荡30 min,离心20 min,过滤 | | F2 | 离子交换态 | 1 mol/L氯化镁溶液 | 25 mL,摇匀,振荡30 min,离心20 min,过滤 | | F3 | 碳酸盐结合态 | 1 mol/L醋酸钠溶液 | 25 mL,摇匀,振荡1 h,放置2 h,离心20 min,过滤 | | F4 | 腐殖酸结合态 | 0.1 mol/L焦磷酸钠溶液 | 50 mL,摇匀,振荡40 min,离心20 min,过滤 | | F5 | 铁锰氧化态 | 0.25 mol/L盐酸羟胺—盐酸混合液 | 50 mL,摇匀,振荡1 h,离心20 min,过滤 | | F6 | 强有机结合态 | 30%过氧化氢、(1+1)硝酸溶液和
3.2 mol/L醋酸铵—硝酸混合液 | 3 mL浓硝酸, 5 mL过氧化氢,摇匀,83 ℃恒温水浴1.5 h,补3 mL过
氧化氢,恒温水浴70 min,加入2.5 mL醋酸铵—硝酸溶液,稀释至
25 mL,放置10 h,离心20min,过滤 | | F7 | 残渣态 | 浓硝酸—高氯酸溶液 | 取F6残渣加15 mL浓硝酸和3 mL高氯酸消煮 |
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Analytical steps for determining the chemical fraction of Se in soil
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Distribution characteristics of soil total Se concentrations in different administrative regions
note: the column height is the arithmetic average, the error line is the calibration error, n is the sample number; the same below
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Distribution characteristics of total Se concentrations in soils from different parent materials
JY—Yunmengshan formation of Jixian system; DQ—Holocene series; ES—Shihezi formation of Permian system; DS—upper Pleistocene series; XD—Daan formation of Neogene system; XL—Luoyang formation of Neogene system; JB—Beidajian formation of Jixian system; DZ—middle Pleistocene series; SL—Liujiagou formation of Triassic system; GC—Chenzhaigou formation of Paleogene system; JC—Baicaoping formation of Jixian system; HX—Xinji formation of Cambrian system
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Distribution characteristics of total Se concentrations in different types of soils
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Distribution characteristics of total Se concentrations in soil under different land use patterns
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Distribution characteristics of total Se concentrations in acidic and alkaline soils
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| 丰缺等级 | 有机质/% | 样本数 | 最小值/10-6 | 最大值/10-6 | 平均值/10-6 | 标准差/10-6 | | 极高 | >4.00 | 51 | 0.311 | 5.670 | 0.802 | 0.789 | | 高 | 3.01~4.00 | 168 | 0.253 | 1.660 | 0.489 | 0.188 | | 中上 | 2.01~3.00 | 1963 | 0.171 | 1.333 | 0.350 | 0.088 | | 中 | 1.01~2.00 | 3204 | 0.066 | 1.166 | 0.269 | 0.062 | | 低 | 0.60~1.00 | 279 | 0.058 | 0.443 | 0.138 | 0.046 | | 极低 | <0.60 | 129 | 0.033 | 0.207 | 0.083 | 0.033 |
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Distribution characteristics of Se concentrations in soils with different organic matter contents
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Distribution characteristics of bioavailable Se concentrations in different types of soils
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Fractions of Se in acidic and alkaline soils
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Fractions of Se in different types of soils
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