title: Constraint on selenium bioavailability caused by its geochemical behavior in typical Kaschin-Beck disease areas in Aba, Sichuan Province of China.
abstract: Kaschin-Beck disease (KBD), an endemic osteoarthropathy, is distributed in the low-selenium (Se)-belt that stretches from northeast to southwest China. However, very few studies have investigated the relationship between low bioavailabitity of Se and KBD. The present study examined the behavior of Se and other elements in areas with varying levels of KBD prevalence using pedological and geochemical methods. Rhizosphere soil samples obtained from the KBD-stricken Aba area were classified into Ustic Isohumisols (J2), Udic Luvisols (L4), Stagnic Gleysols (I2), and Cryic Cambisols (M1) and the integrated constraints on selenium bioavailability in these soils were analyzed. We found that Se concentration in soil profiles from a typical KBD area ranged between 0.08 μg · g(-1) and 0.215 μg · g(-1), indicating absent and marginal bioavailability, respectively. This suggested that low Se bioavailability may be a feature that soils inherit from their Se-deficient parent materials. Moreover, the soil types examined showed different geochemical behaviors such as eluviation for soluble Se(VI), migration of Se(IV) for its adsorption on clay and sesquioxide, and extreme redox conditions. In conclusion, a higher level of Se bioavailability in environment might be related to a lower risk of KBD, and our results offer a foundation for scientific theory on ecological geochemistry and improve our understanding of KBD.
authors.affiliation: School of Sciences and Resources, China University of Geosciences, Beijing 100083, PR China; Key Laboratory of Ecological Geochemistry, Ministry of Land and Resources, Beijing 100037, PR China.
authors.forename: Yaoyao
authors.initials: Y
authors.lastname: Lv
authors.affiliation: School of Sciences and Resources, China University of Geosciences, Beijing 100083, PR China; Key Laboratory of Ecological Geochemistry, Ministry of Land and Resources, Beijing 100037, PR China. Electronic address: yutao@cugb.edu.cn.
authors.forename: Tao
authors.initials: T
authors.lastname: Yu
authors.affiliation: School of Sciences and Resources, China University of Geosciences, Beijing 100083, PR China; Key Laboratory of Ecological Geochemistry, Ministry of Land and Resources, Beijing 100037, PR China.
authors.forename: Zhongfang
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Ningxia Institute of Land Resources Survey and Monitor, Yinchuan 750004, PR China.
authors.forename: Wanfu
authors.initials: W
authors.lastname: Zhao
authors.affiliation: School of Sciences and Resources, China University of Geosciences, Beijing 100083, PR China; Key Laboratory of Ecological Geochemistry, Ministry of Land and Resources, Beijing 100037, PR China.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.affiliation: School of Sciences and Resources, China University of Geosciences, Beijing 100083, PR China; Key Laboratory of Ecological Geochemistry, Ministry of Land and Resources, Beijing 100037, PR China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Wang
mesh_terms: D002681:China / Q000453:epidemiology; D004784:Environmental Monitoring; D006801:Humans; D057767:Kashin-Beck Disease / Q000453:epidemiology*; D012643:Selenium / Q000032:analysis*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D012643:Selenium
keywords: Aba area; Geochemical behavior; Kaschin–Beck disease; Selenium bioavailability; Soils