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Photosensitized oxidation of bromide in Dead Sea water
1098
C. ChemicalOceanography
90:6996 van den Berg, C.M.G. and S.H. Khan, 1990. Determination of selenium in seawater by adsorptive cathodic stripping voltammetry. Analytica chim. Acta, 231(2):221-229. Oceanogr. Lab., Dept. of Earth Sci., Univ. of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK. 90:6997 Vaughan, G.M. and Kenneth Mopper, 1990. Determination of nanomolar levels of formate in natural waters based on a luminescence enzymatic assay. Analytica chim. /lcta, 231(2):299-303. Mopper: RSMAS, Univ. of Miami, 4600 Rickenbacker Cswy., Miami, FL 33149, USA. 90:6998 Westerlund, B.D. (guest editor), 1990. Thirteenth international symposium on column liquid chromatography. Part I. Stockholm, June 25-30, 1989. J. Chromatog, 506:640pp; 49 papers. 90:6999 Westerlund, B.D. (guest editor), 1990. Thirteenth international symposium on column liquid chromatography. Part II. Stockholm, June 25-30, 1989. J. Chromatog, 507:500pp; 53 papers.
C40. Area studies, surveys 90:7(M)0 Wen, L.-S. et al., 1989. Apparent oxygen utilization in the western Philippine Sea and shelf waters near Taiwan. Acta oceanogr, taiwan, 23:19-32. Inst. of Earth Sci., Acad. Sinica, Taipei, Taiwan.
90:7001 Wong, G.T.F., S.-C. Pal and C.-T.A. Chen, 1989. Chemical hydrography across the East China Sea-Kuroshlo frontal region, northeast of Talwan. Acta oceanogr, taiwan, 23:1-18. The hydrography is governed mainly by mixing across the front and topographically induced upwelling of the altered Kuroshio water from ~ 3 0 0 m in the Okinawa Trough during the periodic shelfward migration of the Kuroshio. At the most landward station in the East China Sea, the surface water was fresher, cooler, and about twice as high in silicate as in the Okinawa Trough. Upwelled altered Kuroshio water was much cooler and was characterized by high nutrient and NO concentrations, low 02, and low pH. This upwelled water is potentially a major source of nutrients to the East China Sea. Dept. of Oceanogr., Old Dominion Univ., Norfolk, VA 23529-0276, USA.
OLR(1990)37 (12)
C80. Physical chemistry in seawater 90:7002 Capodaglio, Gabriele, K.H. Coale and K.W. Bruland, 1990. Lead speclation in surface waters of the eastern North Pacific. Mar. Chem, 29(23):221-233. Analyses indicate total dissolved lead concentrations between 17 and 49 pM. The inorganic labile fraction is 30-50%. Titration with lead yielded data consistent with one class of organic iigand(s), present at low concentration (between 0.2 and 0.5 riM). Presence of this ligand, together with the various inorganic ligands in seawater, gives rise to a concentration of free ionic lead of ~0.4 pM. Dept. of Environ. Sci., Univ. of Venice, 30123 Venice, Italy. 90:7003 Gratzel, M. and M. Halmann, 1990. Photosensitized oxidation of bromide in Dead Sea water. Mar. Chem, 29(2-3): 169-182. Photosensitized bromide ion oxidation was studied in acidified oxygenated Dead Sea water by illumination with natural and artificial light. No measurable oxidation was observed in the dark, in the absence of oxygen (or air), or without brine acidification. The oxidation rate was enhanced by increasing acidity, and occurred also in sunlightilluminated air bubble films of the brine, simulating reactions at the air-sea interface. Some photooxidation was observed even in the absence of added photosensitizers or added acid, producing a nonvolatile oxidant. The observed photo-oxidation of bromide in the brine suggests a possible mechanism for abiotic generation of halogenated organic compounds in the marine environment. Halmann: Isotope Dept., Weizmann Inst. of Sci., Rehovot 7610, Israel. 90:7004 Mackey, D.J. and J.E. O'Sullivan, 1990. Metalorganic interactions in seawater: an ecosystem experiment. Analytica chim. Acta, 232(1):161170.
A model plankton ecosystem was used to study the interactions of trace metals and organic compounds over a 10-day period during a phytoplankton bloom. Six 1200-L bags were filled with coastal seawater. Three bags were spiked with copper and one with copper plus nitrilotriacetic acid. Samples were analysed for total dissolved Cu, Zn, Fe, Ni and Mn. The copper complexing capacity was found to be essentially the same in all bags and independent of time. Organically bound complexes of Cu (18% of
C. ChemicalOceanography
90:6996 van den Berg, C.M.G. and S.H. Khan, 1990. Determination of selenium in seawater by adsorptive cathodic stripping voltammetry. Analytica chim. Acta, 231(2):221-229. Oceanogr. Lab., Dept. of Earth Sci., Univ. of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK. 90:6997 Vaughan, G.M. and Kenneth Mopper, 1990. Determination of nanomolar levels of formate in natural waters based on a luminescence enzymatic assay. Analytica chim. /lcta, 231(2):299-303. Mopper: RSMAS, Univ. of Miami, 4600 Rickenbacker Cswy., Miami, FL 33149, USA. 90:6998 Westerlund, B.D. (guest editor), 1990. Thirteenth international symposium on column liquid chromatography. Part I. Stockholm, June 25-30, 1989. J. Chromatog, 506:640pp; 49 papers. 90:6999 Westerlund, B.D. (guest editor), 1990. Thirteenth international symposium on column liquid chromatography. Part II. Stockholm, June 25-30, 1989. J. Chromatog, 507:500pp; 53 papers.
C40. Area studies, surveys 90:7(M)0 Wen, L.-S. et al., 1989. Apparent oxygen utilization in the western Philippine Sea and shelf waters near Taiwan. Acta oceanogr, taiwan, 23:19-32. Inst. of Earth Sci., Acad. Sinica, Taipei, Taiwan.
90:7001 Wong, G.T.F., S.-C. Pal and C.-T.A. Chen, 1989. Chemical hydrography across the East China Sea-Kuroshlo frontal region, northeast of Talwan. Acta oceanogr, taiwan, 23:1-18. The hydrography is governed mainly by mixing across the front and topographically induced upwelling of the altered Kuroshio water from ~ 3 0 0 m in the Okinawa Trough during the periodic shelfward migration of the Kuroshio. At the most landward station in the East China Sea, the surface water was fresher, cooler, and about twice as high in silicate as in the Okinawa Trough. Upwelled altered Kuroshio water was much cooler and was characterized by high nutrient and NO concentrations, low 02, and low pH. This upwelled water is potentially a major source of nutrients to the East China Sea. Dept. of Oceanogr., Old Dominion Univ., Norfolk, VA 23529-0276, USA.
OLR(1990)37 (12)
C80. Physical chemistry in seawater 90:7002 Capodaglio, Gabriele, K.H. Coale and K.W. Bruland, 1990. Lead speclation in surface waters of the eastern North Pacific. Mar. Chem, 29(23):221-233. Analyses indicate total dissolved lead concentrations between 17 and 49 pM. The inorganic labile fraction is 30-50%. Titration with lead yielded data consistent with one class of organic iigand(s), present at low concentration (between 0.2 and 0.5 riM). Presence of this ligand, together with the various inorganic ligands in seawater, gives rise to a concentration of free ionic lead of ~0.4 pM. Dept. of Environ. Sci., Univ. of Venice, 30123 Venice, Italy. 90:7003 Gratzel, M. and M. Halmann, 1990. Photosensitized oxidation of bromide in Dead Sea water. Mar. Chem, 29(2-3): 169-182. Photosensitized bromide ion oxidation was studied in acidified oxygenated Dead Sea water by illumination with natural and artificial light. No measurable oxidation was observed in the dark, in the absence of oxygen (or air), or without brine acidification. The oxidation rate was enhanced by increasing acidity, and occurred also in sunlightilluminated air bubble films of the brine, simulating reactions at the air-sea interface. Some photooxidation was observed even in the absence of added photosensitizers or added acid, producing a nonvolatile oxidant. The observed photo-oxidation of bromide in the brine suggests a possible mechanism for abiotic generation of halogenated organic compounds in the marine environment. Halmann: Isotope Dept., Weizmann Inst. of Sci., Rehovot 7610, Israel. 90:7004 Mackey, D.J. and J.E. O'Sullivan, 1990. Metalorganic interactions in seawater: an ecosystem experiment. Analytica chim. Acta, 232(1):161170.
A model plankton ecosystem was used to study the interactions of trace metals and organic compounds over a 10-day period during a phytoplankton bloom. Six 1200-L bags were filled with coastal seawater. Three bags were spiked with copper and one with copper plus nitrilotriacetic acid. Samples were analysed for total dissolved Cu, Zn, Fe, Ni and Mn. The copper complexing capacity was found to be essentially the same in all bags and independent of time. Organically bound complexes of Cu (18% of