01351naa a2200361 a 450000100080000000500110000800800410001902200140006002400380007410000250011224501880013726000090032530000100033452002870034465000120063165000280064365000140067165000200068565000170070565000090072265000090073165300190074065300200075970000170077970000170079670000170081370000210083070000220085170000150087370000250088870000250091377300510093821840502026-06-12       2026    bl uuuu     u00u1 u    #d  a0013-93517 a10.1016/j.envres.2026.1238182DOI1 aSANTOS, M. G. B. dos  aThe role of oxalic acid in nutrient solubilization, potentially toxic elements from sewage sludge biochar, and remineralizers for sustainable local fertilizers.h[electronic resource]  c2026  a11 p.  aTo ensure food security and sustainability, this study tested oxalic acid to solubilize nutrients in sewage sludge biochar and potassic rocks. The mixture of biochar (300 °C) with rocks and medium acid doses safely released P, K, and Ca, creating promising sustainable fertilizers.  aBiochar  aOrganic acids and salts  aPotassium  aAdubo de Esgoto  aFertilizante  aIodo  aSolo  aIodo de esgoto  aRemineralizador1 aPAIVA, A. B.1 aCOSTA, C. R.1 aPAIVA, M. B.1 aMENDES, G. de O.1 aMARTINS, E. de S.1 aMARCHI, G.1 aLUSTOSA FILHO, J. F.1 aFIGUEIREDO, C. C. de  tEnvironmental Researchgv. 294, e123818, 2026.