Environmental exposure to trace elements has been widely suspected as an etiological factor for the emergence of chronic kidney disease of undetermined origin (CKDu) that prevails in certain districts of the dry zone areas of Sri Lanka. Contaminated rice can be act as a host for potentially toxic trace elements that ultimately led to health hazards; thus, rice soils were investigated in detail, giving particular attentions to identified CKDu hotspots. A total of 102 rice soil samples were collected from main climatic zones viz. wet and dry zones including CKDu hotspots. In addition to pH, electrical conductivity and cation exchange capacity, acid extracted major and trace element contents in rice soils were determined by using ICP-MS. Significant differences were observed for Mn, Ni, Cu, Zn, and Pb contents between climatic zones. Arsenic and Pb contents in soils were lower than the levels reported in soils from other regions of the world, though significantly higher contents were observed in CKDu regions compared to non-endemic wet zone regions. Calculation of enrichment factor revealed that soils in both dry and wet zones were moderately enriched with As, Cd, and Pb, suggesting an influence of anthropogenic processes. Twenty percent of the wet zone samples showed significant enrichment of Ni, Cu, and Zn. Geo-accumulation index assorted that the studied soil samples were uncontaminated to moderately contaminated, implying that rice soils in both climatic zones are not alarmingly contaminated with toxic trace elements. However, regular and continuous monitoring of rice soil quality is extremely important.

环境暴露于微量元素已被广泛怀疑是斯里兰卡干旱地区某些地区普遍存在的不明原因慢性肾病 (CKDu) 出现的病因学因素。受污染的大米可能成为潜在有毒微量元素的宿主，最终导致健康危害；因此，对水稻土壤进行了详细调查，特别关注已确定的 CKDu 热点。从主要气候带共采集了 102 个水稻土壤样品。潮湿和干燥区域，包括 CKDu 热点。除了 pH 值、电导率和阳离子交换容量外，还使用 ​​ICP-MS 测定了水稻土壤中酸提取的主要和微量元素含量。不同气候带的Mn、Ni、Cu、Zn和Pb含量存在显着差异。土壤中的砷和铅含量低于世界其他地区土壤中报告的水平，但与非地方性湿区地区相比，CKDu 地区的含量明显更高。富集因子的计算表明，干湿区的土壤均适度富集 As、Cd 和 Pb，表明受到人为过程的影响。20% 的湿区样品显示出 Ni、Cu 和 Zn 的显着富集。地累积指数将研究的土壤样品分类为未污染到中度污染，这意味着两个气候带的水稻土壤都没有受到有毒微量元素的严重污染。然而，定期和持续监测水稻土壤质量非常重要。