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Organic complexation of copper in throughfall and open field bulk deposition: Influence of the tree canopy of Mediterranean forest ecosystems.

Abstract：

:The complexing capacity for Cu ions (LT) and the apparent stability constant values (logKapp) were measured in throughfall (TF) and open field bulk deposition (BD), at two Mediterranean forest ecosystems of western Greece. LT was measured for the first time in the TF of natural forests. Concentrations of LT were three-to-four-fold higher in TF (mean ± st.dev: 2014 ± 769 nM for Varetada and 1565 ± 595 nM for Karpenissi) compared to those in BD (531 ± 517 nM and 468 ± 321 nM, respectively). In all TF and BD samples, LT concentrations were significantly higher than the corresponding total Cu concentrations, indicating that Cu was fully complexed. The LT/TOC ratios in TF were found comparable between the two study sites (235 ± 149 nM mg-1 C for Varetada and 256 ± 233 nM mg-1 C for Karpenissi) and with those of BD (226 ± 257 and 163 ± 163 nM mg-1 C, respectively). The determined mean logKapp values were almost identical in TF (6.8 ± 0.7 at Varetada; 6.8 ± 0.6 at Karpenissi) and BD (6.5 ± 0.6 at Varetada; 6.8 ± 0.3 at Karpenissi), pointing to the fact that regardless of the enrichment of TF in ligands (LT(TF) > LT(BD)) the type of binding sites remain the same. The logKapp values which were obtained herewith are similar to those obtained for humic-like substances (HULIS), indicating them as the most widespread type of ligands in BD and TF.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Karavoltsos S,Fotiadis F,Michopoulos P,Sakellari A,Plavšić M,Bourletsikas A,Kaoukis K,Thomaidis NS,Dassenakis M,Scoullos M

doi

10.1016/j.chemosphere.2016.09.131

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

28-35

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(16)31332-7

journal_volume

167

pub_type

杂志文章

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