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Title: Speciation and Determination of the Total Dissolved Iron in the Arabian-Gulf at Kuwait Coastal Seawater
Authors: Haifa’a Salah Al-Khuder 
Supervisor: Dr. Dhuha Al-Wahaib
Keywords: Speciation;Total Dissolved;Arabian-Gulf
Issue Date: 2013
Publisher:  Kuwait university - college of graduate studies
Abstract: While iron is an essential nutrient for almost all living organisms, it is believed to be limited to the ocean’s primary producer. It is not clear whether iron limitation or iron bioavailability that influences the growth of the ocean’s primary producer. Also, recent studies have suggested the involvement of iron in the growth of harmful algal. A better understanding of the chemistry of iron in marine environment, which is unclear, is essential to evaluate the reasons behind the limitation in the growth of the ocean’s primary producer and to examine the role of iron in the growth of the harmful algal. Iron speciation data is needed to achieve a better understanding to the chemistry of iron in marine environment, and more importantly is to investigate iron speciation in different regions and for different kinds of water bodies. Therefore, the presented thesis aimed to determine the concentration of the total dissolved iron [FeT] and its speciation in the coastal seawater of the Arabian-Gulf (Doha-Bay (Northern Kuwait) and Khiran (Southern Kuwait)) using competitive ligand equilibration/adsorptive cathodic stripping voltammetry (CLE/ACSV) technique and salicylaldoxime acid as the competitive ligand. The results showed that the total dissolved iron concentration [FeT] in Doha-Bay (57.5 ± 2.1 nM) is twice that of Khiran (27.5 ± 0.7 nM), and the speciation data indicates that more than 99% of [FeT] in the Arabian-Gulf is complexed by two ligand classes, L1 and L2. The concentration of [L1]Doha-Bay is 57.89 ± 0.48 nM and [L1]Khiran is 28.41 ± 0.54 nM, and the concentration of [L2]Doha-Bay is 4.79 ± 0.82 nM and [L2]Khiran is 5.79 ± 1.42 nM. The total ligand concentrations [LT] exceeded [FeT]. The calculated conditional stability constants for L1 and L2 are: Doha-Bay log𝐾𝐹𝑒𝐿1/𝐹𝑒′𝑐𝑜𝑛𝑑= 12.97 ±0.31 and log𝐾𝐹𝑒𝐿2/𝐹𝑒′𝑐𝑜𝑛𝑑= 11.82 ± 0.18, Khiran log𝐾𝐹𝑒𝐿1/𝐹𝑒′𝑐𝑜𝑛𝑑= 12.33 ± 0.29 and log𝐾𝐹𝑒𝐿2/𝐹𝑒′𝑐𝑜𝑛𝑑= 11.28 ± 0.21. The concentration of v the soluble inorganic iron species [Feˈ] for Doha is 7.99 ± 2.39 pM and for Khiran is 9.28 ± 2.48 pM. The obtained data confirms the presence of a strong correlation between [L1] and [FeT]. The concentration of L2 is the same in both investigated sites. The results support the possible governing role of L1 ligands in iron solubility in marine environments. In addition to the importance of the research results to the scientific field, the study results believed to be valuable to Kuwait, since the Kuwaiti coastal area suffered from many environmental related issues following the Iraqi invasion, which were not understood or resolved.
Appears in Programs:0420 Chemistry (M.Sc.)

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