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Petroleum hydrocarbons along the Arabian Gulf coast of United Arab Emirates

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Title Petroleum hydrocarbons along the Arabian Gulf coast of United Arab Emirates
 
Creator Shriadah, Mohammed M.A.
 
Description 10-16
In addition to 20 sediment samples, surface and bottom seawater samples
were collected monthly during 1993-1994 at 24 sampling stations. Oil concentrations
in seawater were below 13 μg 1-1 and ranged from 0.19 to 12.95
μg 1-1 Comparatively
higher concentration levels (5.97 μg 1-1) were recorded at off-shore
stations which are located close to oil tankers' routes in the Arabian Gulf. The other stations, on the other hand,
which represent coastal waters of the United Arab Emirates showed lower
concentration levels (4.18 μg 1-1). Oil pollution levels were also higher at surface layers (4.91 μg 1-1) as compared with bottom
layers (3.70 μg 1-1) reflecting higher rate of
oil dissolution at surface layers. The presence of oil pollution, on the other
hapd, at bottom layers was probably due to: 1) the role of bottom sediments on
the enrichment of overlying water layers by hydrocarbons, 2) the role of
precipitation of thick residual oils after evaporation of lower-boiling-point components
of the oil and the turbulence of water column. The present study revealed
comparatively lower levels (3.93 μg 1-1) and lower vertical gradients (1.17 μg 1-1) for the whole area in the
summer season compared to the winter season (4.18 and 1.64 μg 1-1, respectively) as a result of
a maximum rate of evaporation of lower boiling-point components of the oil and
sinking of thick residual oils during summer months in addition to the
intensity of tanker traffic at the time of sampling. Sediment analysis for
petroleum hydrocarbons suggested the presence of appreciable quantities of
petroleum hydrocarbons in sediments, particularly those from off-shore areas
(7.0 μg-1). However, the levels
reported here and in particular those for coastal areas (6.5 μg-1) were below 10 μg-1of dry weight which correspond
to hydrocarbon concentrations in coastal areas considered unpolluted.
 
Date 2014-01-14T15:33:15Z
2014-01-14T15:33:15Z
1999-03
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25621
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.28(1) [March 1999]