Rennert T, Mansfeldt T
Arbeitsgruppe Bodenkunde und Bodenökologie, Fakultät für Geowissenschaften, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
Environ Pollut. 2006 Jan;139(1):86-94. doi: 10.1016/j.envpol.2005.04.032. Epub 2005 Jul 12.
Deposited gas-purifier wastes are commonly contaminated with trace metals, sulfate and cyanide (CN) compounds. We investigated their release from three soils contaminated with gas-purifier wastes into solution in microcosm experiments under varying redox conditions (E(H) 170-620 mV). The soils differed in pH (2.2; 4.9; 7.4) and featured low amounts of trace metals, but large amounts of total S and total CN. The pH governed trace metal release in the case of the acidic soil and CN release in the case of the slightly alkaline soil. The redox potential controlled trace metal and CN release in the case of the moderately acidic soil. Sources of dissolved SO(4)(2-) were dissolution of gypsum, desorption from Fe oxides and probably oxidation of elemental S. The geochemical behaviors of trace metals (soluble under acidic and reducing conditions) and CN (soluble under alkaline and oxidizing conditions) were diametrically opposed.
沉积的气体净化器废物通常被微量金属、硫酸盐和氰化物（CN）化合物污染。我们在微观实验中，研究了在不同氧化还原条件（E(H) 170 - 620 mV）下，三种被气体净化器废物污染的土壤中这些污染物向溶液中的释放情况。这些土壤的pH值不同（分别为2.2、4.9、7.4），微量金属含量低，但总硫和总氰含量高。在酸性土壤中，pH值控制微量金属的释放；在微碱性土壤中，pH值控制氰化物的释放。在中等酸性土壤中，氧化还原电位控制微量金属和氰化物的释放。溶解的SO(4)(2-)的来源是石膏的溶解、从铁氧化物上的解吸以及可能的元素硫的氧化。微量金属（在酸性和还原条件下可溶）和氰化物（在碱性和氧化条件下可溶）的地球化学行为完全相反。
