Distribution of Arsenic in Fresh and Weathered Rocks in Sri Lanka

Journal of Humanities & Social Sciences Pub Date : 2021-03-16 DOI:10.21203/RS.3.RS-269789/V1

U. Jayawardena

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Abstract

This study was carried out to determine the distribution of arsenic, which may slowly harm human health, in the weathered rocks of different parent rocks in the country. 293 samples were collected from different crystalline rocks and in-situ weathered formations above the particular parent rock in 50 localities. Selected minor elements (including arsenic) were analysed by X-ray fluorescence spectrometry on RIGAKU KG-X system (Japan). Results indicated that the maximum arsenic amount in the fresh rock was 12 and 48 ppm in completely weathered rocks. About 86.9% of fresh rocks showed less than 5 ppm of arsenic, while 89.8% of their weathered grades showed the arsenic concentration to be less than 10 ppm. Average arsenic in all fresh rock samples was 3.5ppm (lowest); it was 7.6 ppm (highest) in residual soils. This is the normal condition of arsenic distribution worldwide. Under this condition, the arsenic concentration in natural groundwater in the residual soil areas should be below the acceptable limit. Therefore, the amount of arsenic released from parent rocks and their weathered products due to natural geological processes is very low in Sri Lanka.

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斯里兰卡新鲜和风化岩石中砷的分布

本研究旨在确定砷在我国不同母岩风化岩中的分布，砷可能对人体健康产生缓慢的危害。在50个地点的不同结晶岩和特定母岩上方的原位风化地层中采集了293个样品。选定微量元素(包括砷)采用日本RIGAKU KG-X系统进行x射线荧光光谱分析。结果表明，完全风化岩石中砷含量最高为12 ppm和48 ppm。86.9%的新鲜岩石砷含量低于5ppm, 89.8%的风化品位砷含量低于10ppm。所有新鲜岩石样品的平均砷含量为3.5ppm(最低);残留土壤中最高为7.6 PPM。这是世界范围内砷分布的正常情况。在此条件下，残积土区天然地下水中砷含量应低于可接受限度。因此，由于自然地质作用，斯里兰卡从母岩及其风化产物中释放的砷量非常低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Humanities & Social Sciences

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