Seasonal Cycles of Dissolved Cd, Mn and Zn in River Water Caused by Variations in pH Induced by Biological Activity
  • 【摘要】

    pH, dissolved oxygen, Zn, Cd and Mn were measured once a month for 2.5 years in the Lot River, France. The pH is controlled by biological activity (photosynthesis and respiration). Dissolved oxygen va... 展开>>pH, dissolved oxygen, Zn, Cd and Mn were measured once a month for 2.5 years in the Lot River, France. The pH is controlled by biological activity (photosynthesis and respiration). Dissolved oxygen variations are due to a combination of biological activity and of the temperature dependence of the oxygen solubility. pH is the master variable for concentrations of aqueous Zn, Cd and Mn, the lowest concentrations being associated with the highest pH values, which occur during the summer. pH-related processes rather than redox phenomena explain variations in dissolved Mn. Variations in dissolved Zn and Cd are also controlled by pH-dependent reactions (possibly related to the dissolutive behavior of solid Mn). 收起<<

  • 【作者】

    Alain C. M. Bourg  Monika A. M. Kedziorek  Catherine Crouzet 

  • 【刊期】

    Aquatic Geochemistry SCI 2000年4期

  • 【语种】

    eng