کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4540680 1326683 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Seasonal distribution of organic matter and copper under stratified conditions in a karstic, marine, sulfide rich environment (Rogoznica Lake, Croatia)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Seasonal distribution of organic matter and copper under stratified conditions in a karstic, marine, sulfide rich environment (Rogoznica Lake, Croatia)
چکیده انگلیسی

Closed, isolated small systems, as the representatives of a “unique-environmental feature”, are valuable natural laboratories for studying different biogeochemical processes. The saline Rogoznica Lake (“Dragon Eye”), situated on the Eastern Adriatic coast is such a system (10 276 m2, 15 m deep) typical of many stratified, sulfide rich water bodies. The depth of mixolimnion changes seasonally and it is greatly influenced by meteorological conditions, i.e. temperature and rainfall. Vertical mixing usually occurs during winter when cold, oxygen-rich water from the surface sinks downwards.In 2009 we monitored seasonal distribution and variation of copper complexing capacity (LT), related apparent stability constants (Kapp), concentration of Cu2+ ions, surfactant activity (SAS), dissolved organic carbon (DOC) and reduced sulfur species (RSS). Our results have shown that LT is increasing with depth up to 8 m depth, while the concentrations of copper ions decrease with the depth due to the higher amount of RSS species in deeper layers. The values of log Kapp are also decreasing with depth as a consequence of a competition of organic ligands and sulfide ions for binding Cu. Below 8 m depth the presence of high amounts of RSS (∼1 mM) influences the electrochemical measuring of copper ion and LT determination, contributing to the copper ion binding.


► Copper complexing capacity (LT), apparent stability constants (Kapp), concentration of Cu2+ ions, surfactant activity (SAS), dissolved organic carbon (DOC) and reduced sulfur species (RSS) were measured in meromictic lake.
► LT is increasing with depth, while the concentrations of Cu2+ decrease with the depth due to the higher concentration of RSS species.
► The presence of high concentration of RSS (∼1 mM) contributes to the copper ion binding.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 92, Issue 2, 10 April 2011, Pages 277–285
نویسندگان
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