摘要
本文用实验的方法研究了铜－盐－有机质共存体系中铜的活化迁移作用。结果表明氨基丙酸和ＮａＣｌ、ＣａＣｌ２的水溶液有很强的活化能力。在铜－盐－有机质共存的水－岩反应体系中，铜的活化迁移与有机质本身性质有关，富里酸与盐相互抑制Ｃｕ难以迁移，而氨基丙酸和盐相互加强对铜的活化。半胱氨酸因热分解产生Ｈ２Ｓ而抑制了铜的活化。铜的活化与赋存状态有关。
A series of experiments were carried out to investigate the mechanism of mobilization and transport of copper in the system of coexisting metallic copper, salt and organic matter. The results demonstrated that there were various mobilization abilities among various reaction agents. Alanine might be potential factor for copper mobilization, with a higher copper concentration of 236.45 × 10￣(-6) at the temperatures lower than 150℃. Fulvic acid could not mobilize effectively copper dispersing in rocks due to its being absorbed by clay minerals. However, it is impossible for cysteine to activate copper from rock because it would decompose and form H_2S even at lower temperatures. Among the inorganic solutions, CaCl_2 and NaCl solutions had potential ability to activate copper, and could reach a copper concentration of 339.6 × 10￣(-6) under appropriate conditions. The HCO- and SO-bearing solutions could, at some cases, leach copper in which copper concentrations exceeded the limit for mineralization.Mobilization and transport of copper were related to the characteristics of organic matters in the water-rock reaction system of coexisting metallic copper, salt and organic matter. At the temperatures lower than 100℃, fulvic acid is difficult to transport copper due to its flocculating in high concentration salts. However, alanine and salts enhance the mobilization ability of copper so as to reach a maximum copper concentration of 460×10￣(-6). Organic matter would decompose when t>100℃,and organic ligands were replaced gradually by inorganic ones and the latters occupy predominant position in the mixing solution. The activation abilities of salts are controlled by HS formed due to decomposing of cysteine in the solution of cysteine and salts, and copper could not be transported in this mixing solution. In addition,mobilization of copper was related to the associations of copper in samples, and copper in absorption state was easily activated.
出处
《地球化学》
CAS
CSCD
北大核心
1995年第C00期191-199,共9页
Geochimica
基金
国家自然科学基金
有机地球化学国家重点实验室资助
