摘要
实验结果证明,天然腐殖酸对Pb、zn元素有很强的结合能力,如每克溶解的胡啡酸可结合487mg Pb、165mg Zn,每克溶解的河流胡敏酸可结合262mg、Pb、308mg Zn;有机-金属络合物具有较高的热分解温度,如在饱和蒸汽压条件下,胡啡酸-Zn络合物开始分解的温度为190±5D℃,乳酸-Zn络合物为180±5℃,EDTA-Zn为200±5℃以及苯醌-Zn为240±5℃。作者认为,在层控铅-锌矿床形成过程中,有机-金属络合物可能是一种重要的迁移形式。
Thermal decomposition temperatures of four organic Zn complexes were evaluated experimentally by determining the change in sphalerite solubility with temperature in aqueous solutions containing organic compounds. The results show that decomposition takes place at 180±5℃ for lactic acid-Zn complex; 200±5℃ for EDTA-Zn; 240±5℃ for quian-Zn and 190±5℃ for fulvic acid-Zn. It also shows that at 190-200℃ sph-alerite solubility is 4 to 7 times higher in NaCl solution containing organic compounds than, that in NaCl solution. Studies were also conducted on the contents of Pb and Zn complexed by fulvic acid and humic acid in aqueous solutions; infrared spectra of fu-lvic acid-Zn and humic acid-Zn complexes; the differential thermal analysis of fulvic acid, humic acid, quian and EDTA; and on the variation in fulvic acid solubility in the seawater with temperature.
出处
《地球化学》
CAS
1986年第1期66-77,共12页
Geochimica
