Cukrov Neven, Cmuk Petra, Mlakar Marina, Omanović Dario
Centre for Marine and Environmental Research, Laboratory for Physical Chemistry of Traces, Ruđer Bošković Institute, POB 180, 10002 Zagreb, Croatia.
Centre for Marine and Environmental Research, Laboratory for Physical Chemistry of Traces, Ruđer Bošković Institute, POB 180, 10002 Zagreb, Croatia.
Chemosphere. 2008 Aug;72(10):1559-1566. doi: 10.1016/j.chemosphere.2008.04.038. Epub 2008 Jun 4.
The spatial distribution of dissolved and total trace metals (Zn, Cd, Pb and Cu) in the Krka River (partly located in the Krka National Park) has been studied using a "clean" sampling, handling and analysis technique. Differential pulse anodic stripping voltammetry (DPASV) with a hanging mercury drop electrode (HMDE) has been used for trace metal analysis. The Krka River has been divided into the upper and lower flow region with respect to the metals concentration and main physico-chemical parameters. A significant increase in trace metal concentration as the result of the untreated waste water discharge downstream of Knin Town has been registered in the upper flow region. Due to a specific characteristic of the Krka, the so-called self-purification process, a decrease in the elevated trace metals concentration from the water column takes place at numerous small lakes formed by tufa barriers (at the end of the upper flow region). The clean groundwater input at the beginning of the lower flow region additionally contributes to the observed decrease in trace metals concentration in the Krka, maintaining them at a very low level in the remaining region of fresh-water flow. The determined median total concentrations were zinc 120-7400 ng l(-1), cadmium 3-8 ng l(-1), lead 11-250 ng l(-1) and copper 110-440 ng l(-1). Karst rivers, such as the Krka River, with extremely low natural concentrations of trace metals are highly sensitive to the anthropogenic influence. Therefore, such aquatic systems require implementation of strict protection regimes in the entire catchments area.
采用“清洁”的采样、处理和分析技术，对克尔卡河（部分位于克尔卡国家公园）中溶解态和总痕量金属（锌、镉、铅和铜）的空间分布进行了研究。使用悬汞滴电极（HMDE）的差分脉冲阳极溶出伏安法（DPASV）进行痕量金属分析。根据金属浓度和主要理化参数，克尔卡河被划分为上游和下游流动区域。在上游流动区域，已记录到由于克宁镇下游未经处理的废水排放导致痕量金属浓度显著增加。由于克尔卡河具有所谓的自净过程这一特殊特性，在由石灰华屏障形成的众多小湖泊处（在上游流动区域末端），水柱中升高的痕量金属浓度有所下降。下游流动区域起始处清洁的地下水注入进一步促使克尔卡河中痕量金属浓度下降，并在淡水流动的其余区域将其维持在非常低的水平。所测定的总浓度中位数分别为：锌120 - 7400纳克/升、镉3 - 8纳克/升、铅11 - 250纳克/升和铜110 - 440纳克/升。像克尔卡河这样痕量金属天然浓度极低的岩溶河流对人为影响高度敏感。因此，此类水生系统需要在整个集水区实施严格的保护制度。
