Lead Accumulation in Tidal Swamps: Case Study at Transmigration Area of South Sumatra Indonesia after 40 Years Cultivation

Lead (Pb) is a heavy metal that poses a major hazard to animals and humans when consumed. The content of this metal is significantly high in paddy soil due to the residual effect of phosphate fertilizer. Therefore, this study aims to determine the Pb content in the tidal swamp that has been used for agriculture for 40 years. It was carried out from October 2021 to January 2022 on tidal soils representing land typology of A, B, C, and D distributed in the Transmigration area of Mulia Sari, Tanjung Lago District, Banyuasin Regency of South Sumatra, Indonesia. A detailed survey was used and soil samples were taken from up to 12 soil sampling points. The variables observed were soil Pb, pH, CEC (Cation Exchange Capacity), pyrite, and C-organic. The results showed that the Pb content in tidal soils obtained was varied, namely 22.52 mg/kg, 14.84 mg/kg, 16.84 mg/kg, and 16.68 mg/kg for A, B, C, and D type of land typologies, respectively. Based on these values, the Pb accumulation has exceeded the threshold, which is 12.75 mg/kg.