Data/hora: 13/06/2024 18:23:17

Provedor de dados: | Ocean Docs: e-repository of  publications
País: | Belgium
Título: | Photooxidation of Dimethylnaphthalene in Deionized water, Red Sea Arti cal water, and Red Sea Natural water
Autores: | Ali, Aasim.
Data: | 2013-01-22
Ano: | 2012
Palavras-chave: | Trace metals.
Resumo: | Red Sea water samples were collected from the Sudanese coast at depths of 10 meter during June 2011 and analyzed for major and trace metals in addition to some inorganic anions. Sodium Na, potassium K, strontium Sr, magnesium Mg, calcium Ca, sulfur S, iron Fe, zinc Zn, manganese Mn, nickel Ni, copper Cu, cadmium Cd, cobalt Co, lead Pb, arsenic As, barium Ba, chromium Cr, europium Eu, lanthanum La, silicon Si, and titanium Ti were analyzed using inductively coupled plasma optical emission spectroscopy (ICP-OES) to determine their existing concentration, their distribution patterns, study the level of contamination in the Red Sea Sudanese coastal water, and the data of the analysis was used in the preparation of the Red Sea arti cial water which was used in the photooxidation of 1,8-dimethylnaphthalene to study the salt e ect on the photooxidation of 1,8-dimethylnaphthalene in Red Sea water. tion patterns and. The inorganic anions, sulfate, chloride, and bromide were determined using ion chromatography (IC). The averages concentrations in ppm (mg/L) of major metals , Na, Mg, Ca, and K are 11870.25, 1449.2, 468.967, and 388.955 respectively. The results shown a small range of variation and regional irregularities. The results also revealed a very high concentration of sodium, and high concentration of magnesium and calcium. In addition to Copper and titanium which was not detected or has concentrationbelow thedetection limit, Arsent (As), Cobalt (Co), Chromium (Cr), Lanthanium(La), and Euribium (Eu) were all not detected, or their concentrations in the Red sea coastal water are below the detection limit of the instrument, hence,preconcentration should be done.The averages concentrations of trace metals in ppm (mg/L), B, Ba, Fe, Li, Mn, Si, Sr, Zn are 4.1935, 0.005515, 0.02524, 0.25073, 0.000085, 0.0656, 7.59765, and 0.006795 respectively. These results revealed . The results shown a small concentration of Sr and this decrease in Sr may be due to the presence of Acantharians. Ba, Sr, Si and Li are not signi cantly di erent in all areas Indicating no distinct concentration gradient. The concentration of iron Fe in Sudanese Red Sea coastal water is high and this increase in concentration can be due to the suspended particles in Sudanese Red Sea because it was not  ltered or due to the pollution because also the concentration of Zn in this study is high. The averages concentrations in ppm (mg/L) of chloride, sulfate, and bromide are, 23240.515,3138.26025, and 61.795 respectively. The results show a small range of variation and regional irregularities. Also, the concentration of chloride is signi cantly. The concentration of sulfate is high. Thus, the high salinity of Red Sea coastal water is due to high concentration of sodium and chloride ions only. Photochemical experiments on the photooxidation of 1,8-dimethylnaphthalene (1,8 DMN) under arti cial sunlight and natural sunlight in deionized water, Red Sea natural water, North Sea natural water, and Red Sea arti cial water, revealed that the photooxidation of 1,8-DMN does not occur in the absence of light at 8C unless the temperature of the media is 35 Cor greater. The results shown that the e ciency of the photooxidation of 1,8-DMN is low and depend on the light intensity, and photosensitizes. The soluble fraction from the Sudanese heavy crude oil was identi ed.
Tipo: | Theses and Dissertations
Idioma: | Inglês
Identificador: | http://hdl.handle.net/1834/4555
Fonte: | http://creativecommons.org/licenses/by-nc/3.0/