Huyen Dang Thuong, Tabelin Carlito Baltazar, Thuan Huynh Minh, Dang Dang Hai, Truong Phan Thi, Vongphuthone Banthasith, Kobayashi Masato, Igarashi Toshifumi
Earth Resources and Environment, Faculty of Geology and Petroleum Engineering, Ho Chi Minh City University of Technology, 168 Ly Thuong Kiet, Dist. 10, HCMC, Viet Nam.
School of Minerals and Energy Resources Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
Data Brief. 2019 Jul 11;25:104230. doi: 10.1016/j.dib.2019.104230. eCollection 2019 Aug.
The Mekong Delta, situated between Cambodia and Vietnam, is one of the most productive aquifer systems in the region. In recent years, however, several studies have shown that groundwater in several areas of the delta is highly contaminated with arsenic (As). Although more than 80% of the total area of the Mekong Delta is situated in Vietnam, most of the studies have been conducted on the Cambodian-side of the delta. In this study, borehole core samples were collected around the Tien and Hau Rivers, the two main branches of the Mekong River as it enters Vietnam. We present a raw data collection of the chemical and mineralogical composition of distinct lithological features from six borehole core samples drilled up to a depth of 40 m. The data also include the pH, Eh, EC, As, Si, Al, DOC, dissolved heavy metals (Fe and Mn) and major coexisting ions of leachates obtained by leaching the 34 selected sediment samples in deionized water. The information provided in this paper would be useful as a baseline for reactive transport or geochemical modeling to understand and predict As migration in naturally contaminated aquifers under various conditions. For more insights, the reader is referred to our paper entitled "The solid-phase partitioning of arsenic in unconsolidated sediments of the Mekong Delta, Vietnam and its modes of release under various conditions" Huyen et al., 2019.
湄公河三角洲位于柬埔寨和越南之间，是该地区生产力最高的含水层系统之一。然而，近年来，多项研究表明，该三角洲多个地区的地下水受到砷（As）的高度污染。尽管湄公河三角洲总面积的80%以上位于越南，但大多数研究是在三角洲的柬埔寨一侧进行的。在本研究中，在湄公河进入越南时的两条主要支流——天江和后江周围采集了钻孔岩芯样本。我们展示了从六个深度达40米的钻孔岩芯样本中获取的不同岩性特征的化学和矿物学组成的原始数据。数据还包括通过在去离子水中浸出34个选定沉积物样本获得的浸出液的pH值、氧化还原电位（Eh）、电导率（EC）、砷、硅、铝、溶解有机碳（DOC）、溶解重金属（铁和锰）以及主要共存离子。本文提供的信息将作为反应性迁移或地球化学建模的基线，以了解和预测各种条件下天然污染含水层中砷的迁移。如需更多见解，读者可参考我们题为《越南湄公河三角洲松散沉积物中砷的固相分配及其在各种条件下的释放模式》的论文（Huyen等人，2019年）。
