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Magnetism and magnetic morphology of river surface sediment and agricultural soil from Rancaekek, West Java
Dini Fitriani, Widya Utami, Kartika Hajar Kirana, Eleonora Agustine, Siti Zulaikah

Department of Geophysics
FMIPA Unpad
Jl. Raya Bandung-Sumedang Km 21
Sumedang 45363


Abstract

Cikijing River is a river that flow in the Rancaekek area, West Java. A number of activities occur around the Cikijing River, such as textile industry and domestic activities. These various activities could affect condition of the river and surrounding environment. One of the impacts that can occur is the decreasing quality of the river due to the pollutants that might be produced by these activities. Cikijing River is also used as a source of irrigation of the paddy fields, so that the paddy field could be also be affected. The presence of pollutants in river sediments and soil over a long period of time could change their physical properties including magnetic properties. We have examined the magnetic properties of surface sediments of Cikijing River and top soil of paddy fields around the river considering that magnetic properties could represent environmental conditions. The results show that sampels of sediment river have magnetic susceptibility in range of 356.2-456.3 (× 10-8) m3kg-1. Meanwhile, samples of topsoil in paddy field are 94.1-347.1 (× 10-8) m3kg-1. The χFD (%) of sediment and topsoil have a range of 1.47%-4.84% and 0.27-4.68%, respectively. The value of χFD (%) < 4% is generally found on samples contaminated by pollutant. Statistical analysis between ??? and the χFD (%) has negative correlation indicates that the change of magnetic properties of the samples influenced by anthropogenic sources. The image of magnetic grains with mesh 230 in size have hedral and spherules shape. Based on energy dispersive spectroscopy analysis the magnetic grains contain Fe, O and Ti. Heavy metal contents such as Pb, Hg, Zn, Cd and Cu are also found in sediment and soil.

Keywords: sediment, soil, magnetic susceptibility, anthropogenic, Cikijing River

Topic: Environmental Magnetism

Link: https://ifory.id/abstract/XBgV7DUWJTbu

Conference: International Conference on Electromagnetism, Rock Magnetism and Magnetic Material (ICER3M 2019)

Plain Format | Corresponding Author (Dini Fitriani)

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