Magnetic Signatures on River Sediments and Agricultural Soils as Proxy Indicators of Anthropogenic-derived Pollution (Case Study: Cikijing River, Rancaekek, West Java)

Abstract

A number of activities occur around the Cikijing River in Rancaekek area, West Java, such as industrial and domestic activities. The various activities could decrease the quality of the river and surrounding environment due to anthropogenic pollutants that might be produced. Since the Cikijing River is also used as the source of irrigation, paddy fields around the river could be also be affected. The presence of pollutants in river sediments and agricultural soils over a long period could change their magnetic properties. Magnetic susceptibility of Cikijing River sediments and soils of the paddy fields in the surrounding have been examined considering that magnetic properties could represent environmental conditions. The results show that river sediments have magnetic susceptibility (cLF) in range of 356.2-456.3 (×10-8) m3kg-1, whereas soils samples have cLF varying from 94.1 to 347.1 (×10-8) m3kg-1, suggesting domination of ferrimagnetic minerals. The cFD (%) is <4% indicating the anthropogenic origin of magnetic minerals. Electron microscopy images show the imperfect octahedral and spherules shapes of magnetic grains that supports magnetic susceptibility analysis about the source of magnetic minerals. Elemental composition analysis reveals Fe and O’s content as main elements, including minor elements of Ca, Mg, Al. Si, Ti and Cr

Identification of Anthropogenic Materials in Lake Ciburuy Sediments Using Physico-Chemical Properties and Pollution Index

“…The SEM images of the sample affected by anthropogenic materials typically exhibit a unique feature, namely a spherule shape. Such images have also been observed in sediments from Lake South Sulawesi, Lake Maar (Tamuntuan et al, 2010), Meža River, Slovenia (Miller and Gosar, 2015), and Cikijing River (Fitriani et al, 2021).…”

Investigasi Sumber Mineral Magnetik pada Sedimen Sungai Biyonga Sebagai Inlet Danau Limboto Menggunakan Parameter Suseptibilitas Magnetik

“…Nilai suseptibilitas mineral magnetik (χLF) sedimen Sungai Biyonga lebih tinggi dari 10 x 10 Namun nilai χLF yang terdapat di sedimen Sungai Biyonga cenderung lebih rendah dari pada di Sungai Cikijing yang berkisar dari 356,2 -456,3 x10 -8 m 3 /kg [15], Sungai Brantas 844,0 -7231,4 x 10 -8 m 3 /kg [16], dan Sungai Citarum 319,6 -1076,6 x 10 -8 m 3 /kg [13].…”