Colloidal Organic Matter and Metal(loid)s in Coastal Waters (Gulf of Trieste, Northern Adriatic Sea)
Colloidal Organic Matter and Metal(loid)s in Coastal Waters (Gulf of Trieste, Northern Adriatic Sea)
复制标题
沿海水域（的里雅斯特湾、北亚得里亚海）中的胶体有机物和金属（类）
作者：
K. Klun;I. Falnoga;D. Mazej;P. Šket;J. Faganeli
在的里雅斯特湾（亚得里亚海北方）进行了大量的海水采样，以研究沿岸沃茨中胶体有机物（COM）与类金属（Me）之间的相互作用。COM（> 5 kDa）通过超滤分离，并使用1H NMR光谱和元素Corg表征。和Ntot。分析。海湾中的COM约占溶解有机碳（DOC）的四分之一，根据1H NMR分析，它由多糖（30-45%），脂质（30-55%），蛋白质和富含羧基的脂环分子（CRAM）（15-20%）和腐殖酸（< 1%）组成。COM的积累，观察到在春末夏初。多糖和脂质部分增加了两倍，蛋白质部分减少，反映在更高的Corg/恩托特(28摩尔）比。较高浓度的腐殖酸，观察到由于当地的淡水排放在春季。来自Isonzo/Soča河的COM与海洋COM不同，表现出更高的蛋白质/CRAM和更高的腐殖酸含量。来自Isonzo/Soča口的COM在盐度16-33处与海洋COM的成分相似。通过ICP-MS和CVAFS（Hg）进行的Me分析表明，Hg（接近100%）、Cu（20%）、Cr（10%）和Se（10%）对胶体具有最高的Me亲和力。类似COM，汞和铜迅速增加，直到夏季，由于他们的螯合在积累COM（转移到颗粒相）。Me/Corg。比值（Co，Cd，Hg < U，Cr，Ni，Mn < As，Zn，Cu，V < Se，Al，Fe）与Irving-Williams系列略有不同，这可以用COM的组成和所研究的北方亚得里亚海Me的可变背景浓度来解释。在金属污染（特别是汞，铅，锌）Isonzo/Soča口的盐度梯度的数据显示絮凝的Al和Ba和解吸的V，Co，As，Se，Cs，U，和Hg，从河流颗粒与离子强度增加，而铁，锰，铜，铬，镍，锌，镉，铅没有与盐度相关。
Large volumes of seawater were sampled in the Gulf of Trieste (northern Adriatic Sea) in order to study the interactions between colloidal organic matter (COM) and metal(loid)s (Me) in coastal waters. COM (> 5 kDa) was isolated by ultrafiltration and characterized using 1H NMR spectroscopy and elemental Corg. and Ntot. analyses. COM in the gulf represents about one quarter of the dissolved organic carbon (DOC), and according to 1H NMR analysis, it is composed of polysaccharides (30–45%), lipids (30–55%), proteins and carboxyl-rich alicyclic molecules (CRAM) (15–20%), and humics (< 1%). An accumulation of COM was observed in the late spring–early summer. The polysaccharide and lipid fractions increased up to twofold and the protein fraction decreased, reflected in a higher Corg./Ntot. (28, molar) ratio. Higher concentrations of humics were observed due to local freshwater discharges in spring. COM from the Isonzo/Soča River differed from the marine COM exhibiting higher protein/CRAM and higher humic contents. COM from the Isonzo/Soča mouth at salinities 16–33 was compositionally similar to marine COM. Analysis of Me, performed by ICP-MS and CVAFS (Hg), showed that Hg (nearly 100%), Cu (20%), Cr (10%), and Se (10%) have the highest Me affinity to colloids. Similar to COM, Hg and Cu rapidly increased till summer due to their sequestration in accumulated COM (transfer to particulate phase). The observed Me/Corg. ratios (Co, Cd, Hg < U, Cr, Ni, Mn < As, Zn, Cu, V < Se, Al, Fe) differ somewhat from those of the Irving–Williams series and can be explained by the composition of COM and variable background concentrations of studied Me in the northern Adriatic. Data from the salinity gradient in the metal-contaminated (especially Hg, Pb, Zn) Isonzo/Soča mouth showed flocculation of Al and Ba and desorption of V, Co, As, Se, Cs, U, and Hg, from the riverine particles with increasing ionic strength, while Fe, Mn, Cu, Cr, Ni, Zn, Cd, and Pb did not correlate with salinity.