吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (1): 181-192.doi: 10.13278/j.cnki.jjuese.20160080
郑国东1, 覃建勋1, 付伟2, 杨志强1, 赵辛金1, 卢炳科1
Zheng Guodong1, Qin Jianxun1, Fu Wei2, Yang Zhiqiang1, Zhao Xinjin1, Lu Bingke1
摘要: 选取广西北部湾地区表层土壤中As元素为研究对象,采集了7 327个土壤样品,400个岩石样品,分析As、K2O、Na2O、CaO、MgO、SiO2、Al2O3、TFe2O3、Mn、Ti、pH和有机碳(SOC)等指标,探讨了土壤成土母岩、成土作用、土壤组成、pH和有机质等对表层土壤As元素的影响。结果表明:As元素平均质量分数为7.96×10-6,为中国土壤背景值0.80倍;风化作用对于As元素的次生富集起到极为重要的作用,明显强于成土母岩As元素背景的影响。Pearson相关分析和主成分分析表明:在土壤组成和土壤性质等因素中,含Al矿物(Al2O3)、含Fe矿物(TFe2O3)、含Si矿物(SiO2)和SOC,对土壤As的富集起到主导作用;pH 和含 Ca矿物(CaO)的作用较弱;而含K矿物(K2O)、含Na矿物(Na2O)和含Mg矿物(MgO)对As的次生富集作用可以忽略不计。
中图分类号:
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