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Publication
Speciation of chromium in Algeciras bay
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Advisor(s)
Abstract(s)
Algeciras Bay is exposed to contamination from chromium because of the industrial activities
carring out around the water, i.e Steel Industry and two Petrol Refineries can be mentioned. More
over there are several activities which are being carried out including big ports, fishing and
recreational activities. Most of the other trace metals in the water have been studied. Considering
the environmental and health effects of this metal, study of its level and speciacion in the bay is
necessary for wellbeing of all which are directly or indirectly dependent on this water.
Unfiltered samples were used for total chromium determination and filtered samples were used for
the other fractions and species of chromium determinations. The samples were collected from five
different sampling points and four times between 2007 and 2009. The first and third samplings
were done in autumn of 2007 and 2008 respectively. The second and the fourth samplings were
done in spring of 2008 and 2009 respectivelly.
Total chromium levels in the water from the bay were lower than the maximum guideline level to
cause toxicity but it was higher than the background levels indicating artificial introduction of
chromium to the water from industrial and/or domestic sources and activities carring out on the
water. It is also found that the total and trivalent chromium level in Algeciras bay were higher than
that of Mediterranean sea but there were no significant differences (=0.05) between hexavalent
chromium levels of the two waters. It is also found that the total chromium, the different fractions
and species of chromium in Algeciras Bay is lower than similar water bodies. There were no
significant differences among the levels of all chromium forms and species studied during the four
seasons but there were significant differences in sampling points for active chromium as well as
dissolved chromium. There also were significant differences in the sampling years for particulate
chromium as well as dissolved chromium. The correlations among the chromium fractions and
species were also studied.
Description
Keywords
Crómio Baía de Algeciras Poluição