Mercury Dynamics in the Sea of Azov: Insights from a Mass

Overview

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Key numbers

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outflow from and into the Black Sea. About 90% of all riverine inflow is discharged from
total suspended solids (TSS, 18.1 and 125 mg/L, respectively (37,38)). The SoA receives
discharge into the Black Sea constitutes around 53–55 km3 /yr, while the total inflow ranges
19.1 mg/L (31,40)), with an average organic carbon content of 16.5% (40). Due to the
large discharge of nutrients and sediment (~25.8 mg/L TSS), the river deltas not only
and low resuspension rate (64%), bottom sediments contain only 2.42% organic carbon.
mass balance (4.6%) (37,42,43).
increased to 6.0 ng/m3 . Further, Fedorov et al. stated that 28% of the total Hg (tHg)
hotspots and concentration gradients observed in empirical surveys (Table 1).
Table 1. Mercury concentration data from the literature for water and sediment in the Sea of Azov.
ance model (90%). Due to the spatiotemporal variability in water temperature andspeeds
model (90%). Due to the spatiotemporal variability in water temperature and wind wind
As documented in Table 1, Hg concentrations in water and sediment are highly
As documented in Table 1, Hg concentrations in water and sediment are highly de-
(Rutilus heckeli) between 1992 and 2012 (max. 0.1 µg/kg) and decreasing levels until 2018 (4).
resulting in a range of unspecific adverse effects (23,69), which could threaten the stability
(0.68 ppm vs. 0.17 ppm (73)). During the last 200 years, approximately 10 billion tons of
1. Fedorov, Y.; Mikhailenko, A.; Dmitrik, L.; Dotsenko, I.; Solodko, D.; Chepurnaya, V. Mercury and Iron in Atmospheric Precipitation
Mercury Budget from a Coupled Atmosphere-Land-Ocean Model: 40% More Re-Emissions Buffer the Effect of Primary Emission

Methods (brief)

1. Fedorov, Y.; Mikhailenko, A.; Dmitrik, L.; Dotsenko, I.; Solodko, D.; Chepurnaya, V. Mercury and Iron in Atmospheric Precipitation
Electrothermal Atomic Absorption Spectrometry. J. Anal. Chem. 2019, 74, 1184–1191. (CrossRef)

Implications

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