Selenium speciation in surface soil in Yaling Town, Yichuan County—Xiaodian Town,Ruyang County in Luoyang City
HOU Jin-Kai1,2(), SONG Yan-Bin1,2, ZHU Rui-Zhen1,2, XIN Feng-Pei1,2, ZHOU Jian-Chuan1,2, LU Fu-Lan1,2, YAO Jie1,2
1. No. 1 Geology and Mineral Resources Survey Institute,Henan Bureau of Geology and Mineral Development,Luoyang 471023,China 2. Gold and Silver Polymetallic Metallogenic Series and Deep Prediction Key Laboratory in Henan Province,Luoyang 471023,China
Surface soil samples in Yaling Town, Yichuan County -Xiaodian Town, Ruyang County in Luoyang City were collected and analyzed to study the selenium (Se) speciation and its influencing factors. The study results are as follows. Existing Se in the surface soil of the study area mainly occurs in humic acid, residue, and strong organic states, while the sum of Se in water-soluble and ion-exchange states only accounts for 2.70% of total Se in the surface soil. Therefore, the Se in the study area shows the characteristics of the low content of water-soluble Se and a significantly high proportion of organic Se in total Se. The Se speciation in the surface soil is affected by the total Se content, pH, organic matter content, and type of soil. Specifically, the proportion of bioavailable Se in alkaline soil is significantly higher than that in neutral and acidic soils, and the bioavailable selenium content increases with increasing soil pH. Especially, the organic matter content in the soil has the most significant effects on organic Se but has no significant effect on bioavailable Se. For different types of soils, the proportion of the sum of Se in water-soluble and ionic-exchange states in total Se is in the order of red clay>paddy soil>brown soil>skeleton soil>fluvo-aquic soil>lime concretion black soil.
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