Behaviour of Mercury Around the Landfill of Tamangapa Antang, Makassar City, Indonesia

Abstract

Study of mercury behaviour has been conducted to know the spread of mercury (Hg) vertically and laterally around the Tamangapa Antang Landfill, Makassar City, Indonesia. Thirty-six samples (top soil) were collected in the area of Antang Landfill. The samples were devided into four lines, namely lines A, B, C, and D. Every line consist of three holes (line A: Hole A1, A2, A3); (line B: Hole B1, B2, B3); (line C: Hole C1, C2, C3) and (line D: Hole D1, D2, D3). Every hole was devided into three layers (Upper, Middle and Lower layer) with a thickness of layer 10 cm respectively. Furhermore all samples (top soil) were analyzed by means of cold vapour Atomic Absorption Spectrophotometer method (mercury determinition). The result of the study shows that the mercury in the study area has spread vertically and laterally around the Antang Landfill. The concentration of mercury in vertikal and lateral profile vary from 0.02 to 0.07 ppm. Eight top soil samples (A1-upper, A1-middle, A2-upper, A3-upper, A3-middle, D3-upper, D3-middle and D3-lower) were identified above the threshold level (according to State Minister for the Environment of Indonesia, number 51 2004 with threshold limit 0.05 ppm). Otherwise twenty-eight samples were found at the normal limit (less than 0.05 ppm). pH value in the studied area varies from 4.82 to 6 and it is shows an acidic condition. Soil pH significantly affects solubility and mobility of metals, since most metals dissolve in acid soils. So that proper remediation or precautions are needed to prevent risks to humans and the environment.