Cindrić Ana-Marija, Garnier Cédric, Oursel Benjamin, Pižeta Ivanka, Omanović Dario
Ruđer Bošković Institute, Center for Marine and Environmental Research, Bijenička 54, Zagreb, Croatia.
Université de Toulon, PROTEE, EA 3819, 83957 La Garde, France.
Mar Pollut Bull. 2015 May 15;94(1-2):199-216. doi: 10.1016/j.marpolbul.2015.02.029. Epub 2015 Mar 7.
Distributions of trace metals (TM), organic carbon, SPM and physico-chemical parameters were studied in the highly stratified Krka River estuary in winter/summer periods. The non-conservative behaviour of Zn, Cd, Pb and Cu in the brackish layer (plume), easily spotted due to very low inputs by the river, was mainly caused by their inputs from the pleasure boats, nautical marinas and harbour (e.g. release from antifouling paints). Contrarily, Ni and Co followed near-conservative behaviour. The extremely low SPM discharged by the river, resulted in a predominant dissolved fraction (>80%) of all TM, except Pb. Vertical scavenging, coupled with the long residence time, caused accumulation and progressive upstream increase of TM and SPM in the bottom seawater. Decrease of distribution coefficient (KD) in the brackish layer for winter period was ascribed to the change of SPM nature (terrestrial vs. biogenic), whereas a variable and increased biogenic component of SPM caused scattered KDs in summer.
在冬季/夏季期间，对高度分层的克尔卡河河口的痕量金属（TM）、有机碳、悬浮颗粒物（SPM）和理化参数的分布进行了研究。在咸淡层（羽状流）中，锌、镉、铅和铜呈现非保守行为，由于河流输入量极低，这种行为很容易被发现，其主要原因是来自游船、航海码头和港口的输入（例如防污漆的释放）。相反，镍和钴呈现近保守行为。河流排放的悬浮颗粒物极低，导致除铅外所有痕量金属的溶解部分占主导（>80%）。垂直清除作用加上较长的停留时间，导致痕量金属和悬浮颗粒物在底部海水中积累并向上游逐渐增加。冬季咸淡层中分配系数（KD）的降低归因于悬浮颗粒物性质的变化（陆地来源与生物源），而夏季悬浮颗粒物中可变且增加的生物源成分导致分配系数分散。
