Hydrogeochemical Processes in the Kafue River upstream from the Copperbelt Mining Area, Zambia
  • 【摘要】

    Frequent sampling during an annual cycle of dissolved (<0.45 #mu#m) and suspended (>0.45 #mu#m) elements has been conducted in the Kafue River at Raglan's Farm, upstream from the mining activiti... 展开>>Frequent sampling during an annual cycle of dissolved (<0.45 #mu#m) and suspended (>0.45 #mu#m) elements has been conducted in the Kafue River at Raglan's Farm, upstream from the mining activities within the Copperbelt Province, Zambia. Additional sampling of sediment and interstitial pore water was conducted during low water discharge. The presence of carbonates within the drainage basin naturally gives rise to high element concentrations in the dissolved phase (Ca = 626, Mg = 494, Na = 360 and K = 24 mmol 1~(-1)). During the rainy season the relative composition of the dissolved elements indicated a wash out of accumulated weathering products and mineralised organic material from the unsaturated zone of the soil profile. High concentrations of dissolved Al, Fe and Mn were measured during high water discharge. At low water discharge the sediment was a major source of Fe, Mn and associated Co and Cu to the water column. Enhanced concentrations of dissolved and suspended S, Co and Cu during the rainy season indicated that atmospheric deposited particles from the mining area were washed out into the river. Autochthonous formation of particles rich in Si indicated diatom production during low water discharge. 收起<<

  • 【作者】

    Ulf T. Pettersson  Johan Ingri  Per S. Andersson 

  • 【刊期】

    Aquatic Geochemistry SCI 2000年4期

  • 【语种】

    eng