Identification Of Pyrite In The Peat Ecosystem of Khg Batang Rokan Kiri-Batang Sosa, Riau Province-Indonesia

Abstract

Objective: The substratum or mineral material under the peat layer is the material taken at the end of the drill; it can be quartz sand, clay, pyrite sediment, granite, lime, or others. One indicator of peatland damage is the discovery of Pyrite, especially in the substratum layer. Identification of sediment outcrops of pyrite content, estimating the extent of distribution of exposed pyrite sediments. Outcrops of oxidized Pyrite can lower the pH of the soil to very acidic. Increased acidity in peat soils and the conversion of organic matter into organic acid acids also occur due to pyrite oxidation (Fe2S). When oxidized, Pyrite as a marine sediment will produce excessive H+ ions so that the pH can drop to 2.0-3.0.   Methods: The documentation of field survey points based on GPS coordinates and land elevation readings, photos of land cover taken from four angles to depict the field situation, images from soil drilling, Pyrite tests, pH Substratum, EC Substratum, groundwater pH, TDS groundwater, TMAT (groundwater level), channel drainage, pH of channel water, EC of channel water, and TDS of channel water all support the data in the tally sheet.   Results: This study aims to identify the location of pyrite exposure in peatland ecosystems in KHG Batang Rokan Kiri-Batang Sosa, Riau Province-Indonesia. The results showed that 10 of the 622 drill points found Pyrite, elevation height between 12-24 m asl, groundwater level between 0-84 cm, peat depth between 234-676 cm, and groundwater pH ranging from 3-4.3. Based on the results of this study, peat management identified as pyrite sediment requires more attention, mainly so that the pyrite layer is not exposed and is not oxidized, which hurts increasing soil acidity.   Conclusions: Among the conclusions that can be drawn is that pyrite layers have been found at peat depths ranging from 234-676 cm, according to the findings of field studies (medium to deep peat category). Ten of the 622 drill sites were discovered to be represented by pyrite sediments along the Rokan River. Pyrite sediment dispersion tends to concentrate, suggesting the existence of pyrite layers. To prevent the pyrite layer from being exposed, which lowers soil acidity and can harm both the environment and the soil, pyrite peat sites must be managed carefully.   Research Implications: Natural peatland drainage and conversion also impact peat soils' physical and chemical properties, increasing the likelihood of fires, hazy air pollution, and carbon emissions.   Originality/value: Identification of Pyrite In The Peat Ecosystem Of Khg Batang Rokan Kiri-Batang Sosa, Riau Province-Indonesia.