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Soil selenium transformation across different parent materials in Pothwar uplands of Pakistan
Arabian Journal of Geosciences Pub Date : 2020-10-15 , DOI: 10.1007/s12517-020-06111-1
Muhammad Imran , Mohammad Saleem Akhtar , Ayaz Mehmood , Shah Rukh , Ahmad Khan , Chen Zhikun , Ghulam Mujtaba

Selenium (Se) is an essential trace element for humans but non-essential for plants. Selenium bioavailability depends on selenium forms in soil. Selenium contents may vary with the source of parent material, and pedogenesis controls its vertical distribution. The objectives of this study were to determine the variation in Se fractions with parent material and pedogenesis in Pothwar uplands of Pakistan. Triplicate soil profiles at different development stages from selected parent materials (sandstone, alluvium, loess, and shale) were sampled at different genetic horizons level. The soils were characterized for pH, dissolved organic carbon, total organic carbon, dithionite extractable amorphous iron, and cation exchange capacity. Soil selenium was fractioned into ion-exchangeable, metal oxides, organic, humic, sulfide, and residual selenium. Selenium in the soil extract was measured using HVG-AAS after centrifuge and passing through a 0.45-μm cellulose free filter. The distribution of total selenium content and selenium fractions varied with the type of parent material and soil genesis. Total selenium contents differed significantly across the different parent material. The highest total selenium was in shale followed by loess, alluvium, and sandstone, respectively. Exchangeable ion, metal oxides, and organic matter selenium were more in loess or the same level as of shale. Evaluation of the distribution of selenium fractions enabled us to estimate the occurrence of potential selenium deficiency and toxicity to humans and animals based on the parent materials and pedogenesis.



中文翻译:

巴基斯坦Pothwar山地上不同母体土壤硒的转化

硒是人体必需的微量元素,但对植物却不是必需元素。硒的生物利用度取决于土壤中硒的形式。硒的含量可能随母体物质的来源而变化,并且成岩作用控制着其垂直分布。这项研究的目的是确定巴基斯坦Pothwar高地中硒含量随母体物质和成岩作用的变化。在不同的遗传视野水平上,从选定的母体材料(砂岩,冲积层,黄土和页岩)的不同发育阶段一式三份的土壤剖面进行了采样。表征土壤的pH,溶解的有机碳,总有机碳,连二亚硫酸盐可萃取的无定形铁和阳离子交换容量。将土壤中的硒分为可离子交换的,金属氧化物,有机,腐殖质,硫化物和残留硒。离心后,使用HVG-AAS测定土壤提取物中的硒,并使其通过0.45-μm的无纤维素过滤器。总硒含量和硒含量的分布随母体材料类型和土壤成因而变化。不同母体材料中的总硒含量差异显着。总硒含量最高的是页岩,其次是黄土,冲积层和砂岩。黄土中的可交换离子,金属氧化物和有机物硒含量更高,与页岩含量相同。对硒组分分布的评估使我们能够根据母体材料和成虫作用来估计潜在的硒缺乏症以及对人和动物的毒性。45微米无纤维素过滤器。总硒含量和硒含量的分布随母体材料类型和土壤成因而变化。不同母体材料中的总硒含量差异显着。总硒含量最高的是页岩,其次是黄土,冲积层和砂岩。黄土中的可交换离子,金属氧化物和有机物硒含量更高,与页岩含量相同。对硒组分分布的评估使我们能够根据母体材料和成虫作用来估计潜在的硒缺乏症以及对人和动物的毒性。45微米无纤维素过滤器。总硒含量和硒含量的分布随母体材料类型和土壤成因而变化。不同母体材料中的总硒含量差异显着。总硒含量最高的是页岩,其次是黄土,冲积层和砂岩。黄土中的可交换离子,金属氧化物和有机物硒含量更高,与页岩含量相同。硒组分分布的评估使我们能够根据母体材料和成虫作用来估计潜在的硒缺乏症以及对人和动物的毒性。不同母体材料中的总硒含量差异显着。总硒含量最高的是页岩,其次是黄土,冲积层和砂岩。黄土中的可交换离子,金属氧化物和有机物硒含量更高,与页岩含量相同。硒组分分布的评估使我们能够根据母体材料和成虫作用来估计潜在的硒缺乏症以及对人和动物的毒性。不同母体材料中的总硒含量差异显着。总硒含量最高的是页岩,其次是黄土,冲积层和砂岩。黄土中的可交换离子,金属氧化物和有机物硒含量更高,与页岩含量相同。对硒组分分布的评估使我们能够根据母体材料和成虫作用来估计潜在的硒缺乏症以及对人和动物的毒性。

更新日期:2020-10-15
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