Caspian Sea State of the Environment 2019
The outcomes for samples taken from different areas of water are shown in Table 5.9. As the ta- ble demonstrates, changes in pollutant concen- trations are quite wide-ranging and bear little
Total petroleum hydrocarbons and concentra- tions of heavy metals (copper, nickel, chromi- um6+, manganese, zinc, lead and cadmium) in the bottom sediment samples were analysed.
Table 5.10: Organic pollutant content of bottom sediments of the north-western part of the Caspian Sea, 2012–2014.
September– October 2012
November– December 2012
September– October 2013
August– December 2014
Pollutant
Total PAH, µg/kg
2.4–242
17.3–699
<0.03–309
<0.03–531
Total PCBs, µg/kg
<0.03–6.70
0.35–10.8
<0.03–2.12
0.10–2.50
Hexachlorobenzene, µg/kg
<0.03–0.2
<0.03–0.25
<0.03–0.3
<0.03–0.40
Total DDT, µg/kg
<0.03–1.15
<0.03–4.72
0.11–1.74
<0.03–6.50
Total HCH, µg/kg
<0.05
<0.05
<0.05–0.21
<0.05–1.80
Phthalates, µg/kg
380–3,920
130–17,210
70–2,320
Source: Reviews of the state and pollution of the marine environment of the north-western part of the Caspian Sea in 2012–2014 (Monakhov 2014a; Monakhov 2014b; Monakhov 2015).
Table 5.11: Main indicators of sea bottomsediment contaminants around oil and gas fields (Filanovsky oilfield and Korchagin oilfield in 2017, compared with historical and contemporary background concentrations).
Concentration in 2017
Background concentration
Indicator
Filanovsky Field
Korchagin Field
Contemporary **
Historical *
1.37…12.7
0.4…11.1
0…57.0
0…68.0
Oil products, mg/kg
10.8…31.7
8.4…25.3
0…120
0.50...66.0
Surfactants, mg/kg
0…1.68
0…26.5
0…506
0…313
Total PAH, μg/kg
8.4…20.4
4.0…125
0…226
1.10…166
Zinc, mg/kg
5.70…19.2
5.6…41.0
0…48.0
3.30…54.0
Nickel, mg/kg
2.40…5.50
2.80…13.0
0…70.0
3.70…55.0
Copper, mg/kg
1.50…5.30
1.0…6.30
0.60…32.0
0…35.0
Lead, mg/kg
0.11…0.28
0.10…0.23
0.02...0.65
0…8.00
Cadmium, mg/kg
56…497
58…471
0…3,100
–
Barium, mg/kg
* LUKOIL data for 1998–2009 (LUKOIL-Nizhnevolzhskneft n.d.) ** Roshydromet data (Monakhov 2014a; Monakhov 2014b; Monakhov 2015) Source: Kuzin 2018.
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