Dang Mai, Nguyen Thuy Duong, Tong Thi Thu Ha, Dang Quang Khang, Nguyen Van Niem, Xuan Dinh Thanh

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Abstract. 17 samples collected from two drill holes (QO.01 and QO.03) at Quoc Oai (Hanoi) were analysed the main chemical compositions in oxides SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O by XRF method and some trace metal elements such as As, Cu, Pb, Zn, Sb, V, Cr, Ni, Cd by AAS method. According to these results, content of SiO2, Al2O3, Fe2O3 are the highest, the next is K2O, TiO2 and the other oxides are very low. The sediments in the Vinh Phuc formation have rich Fe2O3 by laterization, whereas those in the Hai Hung formation have rich K2O by the potassium-absorption in the organic matters. In the sediments, there are close relationship between the alkaline and alkaline earth elements, and the titan oxide is positively correlative with Al2O3 and Fe2O3.

The arsenic content in almost samples is higher than 10mg/kg, somewhere else up to 41 mg/kg, exceeding many folds compared to the average level found in the earth’s crust and in the clay sedimentary. The antimony content (Sb) is also increased high with theclarkindex from 8.06 to 125.6 mg/kg. The behaviors of As, Cu, Pb, Zn are very similar to each other in the samples of 02 holes QO.01 and QO.03, that is highly concentrated in the upper sediments of the Vinh Phuc formation and in the rich-organic lower sediments of the Hai Hung formation.  It seem probable that As is existed as sulfur phases and absorbed by the organic materials. It is able to infer sedimentary source and accumulated arsenic content from the linear correlation coefficient between siderophile and Cu, As, which, as a basic for judging the cause pollution ofHanoigroundwater.

Keywords: Vinh Phuc formation; arsenic, antimony, copper; siderophile elements; drill hole;Hanoi area


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