Correlation of Hg-N on ex-gold mining soil ameliorated with Sub-Bituminous coal and activation of Sub-Bituminous coal–NaOH

Abstract

Mercury (Hg) contamination has become a serious threat to ecosystems. Amelioration technology for soil is expected to control the specific interactions between N in ex-gold mining soil contaminated with Hg. This research aimed to analyze the interaction of Hg-N on ex-gold mining soil ameliorated with sub-bituminous coal and the activation of sub-bituminous coal with 10% NaOH. The experimental design used in this study was a Completely Randomized Design with three replications. The treatment I (Sub-bituminous coal) and II [activation of Sub-bituminous coal with 10% NaOH) was implemented in the pot with equivalent doses, respectively: (A) 0 [0g 100g-1 soil], (B) 10 [0.5g 100g-1 soil], (C) 20 [1g 100g-1 soil], (D) 30 [1.5g 100g-1 soil], and (E) 40 t ha-1 [2.0g 100g-1 soil]. The correlation between total Hg with total Nl on ex-gold mining soil ameliorated with sub-bituminous coal [r = -0.889** or Hg = -9.9794 (N) + 6.9097; R2 = 0.9222] and activation of sub-bituminous coal with 10% NaOH [r = -0.835** or Hg = -4.3111 (N) + 6.4265; R2 = 0.8156]. Amelioration technology on ex-gold mining land with sub-bituminous coal and activation of sub-bituminous coal with 10% NaOH can reduce the total Hg by 2.50 and 2.84 mg kg-1 and also increase the total N by 0.23 % and 0.53% respectively, compared to control.

Effect of Sub-Bituminous Coal on Negative Charge Activity on Secondary Forest and Horticultural Land Contaminated with Pesticides in Sungai Pua, Agam

“…Various studies have shown the optimal potential of sub-bituminous coal (SC) as an ameliorant soil, starting from its high humic substance (HS) content to its powder form and activation process, which can increase pH, CEC, and soil organic matter (SOM) on marginal lands (Herviyanti et al, 2021;Prasetyo et al, 2023;Maulana et al, 2023). Increased soil pH and CEC are important indicators in studying the phenomenon of modification of negative charge activity in soil (Hermawan et al, 2014).…”