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International Journal of Marine Science 2014, Vol.4, No.12: 108-118
http://ijms.sophiapublisher.com
111
-98mV to -81mV (Figure 7C). Station 4 was the
lowest value. The domestic wastewater is discharged
in this coastal area without any treatment.
The pH values of the sediment samples varied in the
range of 7.23 to 9.40, its organic matter varied in the
range of 0.11 to 2.6 percent indicates that there was a
domestic and agricultural pollution accumulation at
the sediment layer of Sinop coasts. Furthermore on the
water samples which were collected parallel to the
sediment sampling stations in the same period, BOD
5
,
TSS, T (
℃
), pH, NO
2
-N, NO
3
-N, organic matter,
dissolved oxygen, salinity, conductivity and silicate
analyses were also performed (Tables 2, 3 and 4).
According to these analytical results, it can be
concluded that Sinop domestic discharge points has
polluted water for NO
2
-N, NO
3
-N and TSS parameters
at class 2 or even if very polluted class 4 water class
(Gökkurt
et al
., 2007).
Table 2 pH values of sediment samples (X ± S
X
)
Table 3 Redox potential (Eh) values of sediment samples
(X ± S
X
)
Station
Summer Autumn
Winter
Spring
1
-124
-98
-86
-85
2
-116
-152
-113
-98
3
-69
-63
-90
-94
4
-145
-135
-125
-87
5
-82
-52
-34
-85
6
-45
-66
-32
-81
7
119
102
203
191
8
-80
-76
-84
-96
According to the Environment Law-Water Pollution
Control Legislation, Land-Based Water Quality
Classification (Turkish Environmental Regulation
2004), generally, it has polluted water and the origin
of this pollution is mainly domestic (see Tables 5 and
6). The pollution load of the water body also appeared
at the sediment layer, especially with its high organic
matter content. In sediment samples, redox potential
values were usually determined negative and this
result showed in discharged points (Table 3). These
results verified with organic matter values and water
samples.
Other researchers have reported high organic content
(5.61 %) in Samsun Mert Stream (Bakan and Senel,
2000). The high organic matter content in the Samsun
Mert Stream sediments is mainly due to agricultural
and domestic discharges. In our study, organic matter
was 2.6 % with fine grain, wet clay form bad smell
and dark color in station 4. This is probably a result of
the sulfide and organic matter concentrations. The
results of the present study are similar to those
reported by Bat and Culha (2001). Organic content in
sediment found between 1,2 % and 3,4 % in Sinop
inner on 2001.
Especially in shallow water, the turbidity is reason of
decreasing oxygen and according to accumulation of
organic matter the increasing of oxygen consumption.
This situation result was high turbidity, muddy sand
and bad smell (Özel, 1992).
The research area of Sinop peninsula coasts, affected
with intensive land-based pollution and organic matter
discharge originating from domestic discharge.
The dissolved oxygen (DO) level in Sinop Peninsula
of the Black Sea wastewater ranged from 2.2-8.9 mg/L
in 2006 and 2007, compared with 5.17-6.48 mg/L in
1999 (Bat
et al.,
1999). Many factors determine DO
levels in wastewater including surface water
temperature, which has an inverse relationship with
DO, photosynthesis by green algae, salinity, organic
matter and pollution. Organic waste and other nutrient
inputs from sewage and industrial discharges,
agricultural and urban runoff can decrease DO levels.
High nutrient inputs usually lead to algal blooms. In
the present case, the DO levels of station 2 (2.2 mg/L)
were considered not suitable for aquatic life. It is
concluded that Sinop coasts may be face with big
danger because of untreated domestic discharges.
The temperatures recorded at sample locations ranged
from 9.3-30.8
℃
. The water temperatures of Sinop
coast were within Water Pollution Control Regulations
of 2872 the Official Gazette Environment Law (<25°C)
for water (Table 5) Class II/III/IV for all stations
maximum values; therefore, the treated wastewater
released from waste water treatment plant is in need of
Stations Summer
Autumn
Winter
Spring
1
9.05±0.101 8.99±0.102 8.47±0.105 8.52±0.104
2
8.80±0.289 9.10±0.284 7.69±0.309 7.32±0.317
3
8.08±0.060 8.42±0.059 8.36±0.059 8.46±0.059
4
9.40±0.375 9.15±0.380 7.36±0.424 7.23±0.427
5
8.34±0.035 8.12±0.035 8.24±0.035 8.32±0.035
6
7.66±0.055 7.42±0.056 7.36±0.056 7.32±0.056
7
8.98±0.010 8.92±0.010 8.99±0.010 8.97±0.010
8
8.28±0.021 8.14±0.021 8.18±0.021 8.22±0.021