Some remarks on the removal rates of H2S within the suboxic zone of the Black Sea

Gokmen, S
Basturk, O
This work constitutes an initial effort for studying the removal and/or oxidation rates of hydrogen sulfide at different surfaces of the suboxic zone of the Black Sea. The measurements were made by mixing waters from the suboxic zone (sigma(theta)=15.70-16.20) and from the upper layer of the anoxic zone (sigma(theta)=16.50). The half-life of H2S removal within the interior of cyclonic gyre was found to be twice that measured in the rim current region close to the Bosphorus northern exit, whereas the largest half-lives were measured in the anticyclonic eddy. Fine particle layer (FPL), as displayed by minima in the % light transmission, was also studied for the vertical distributions of particulate iron and manganese. In the cyclonic system, the FPL was not as pronounced as in the anticyclonic eddy. The concentrations of particulate Fe & Mn were also determined in order to visualize the mutual interactions between particulate forms of iron, manganese and hydrogen sulfide, in samples which were filtered through 1.2 mu m microfiber filters.


Comparison of TOC concentrations by persulphate UV and high temperature catalytic oxidation techniques in the Marmara and Black Seas
Tuğrul, Süleyman (Elsevier BV, 1993-01-01)
Total organic carbon (TOC) concentrations were determined in the Marmara Sea and both oxic and anoxic waters of the Black Sea, using the Shimadzu high-temperature catalytic oxidation technique and the Technicon persulphate-UV oxidation method. The TOC values in the deep waters of the Marmara Sea ranged between 60 and 73 μ MC by the Shimadzu technique and from 40 to 50 μMC by the Technicon method. The TOC values obtained by both methods in the deep anoxic waters of the Black Sea varied between 105 and 130 μM...
Analytical pyrolysis of suspended particulate organic matter from the Black Sea water column
Coban-Yildiz, Yesim; Fabbri, Daniele; Baravelli, Valentina; Vassura, Ivano; Yilmaz, Aysen; Tuğrul, Süleyman; Eker-Develi, Elif (Elsevier BV, 2006-01-01)
The chemical composition of suspended particulate organic matter (SPOM) in the Black Sea water column has been characterized by pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The results are discussed in terms of the hydro-chemical properties of the water column. Phytoplankton cultures grown in the lab also were analyzed to provide reference information for the euphotic zone SPOM. The composition of SPOM in the Black Sea displays important vertical variations dependent on specific distinct bioch...
Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
Aad, G.; et. al. (Springer Science and Business Media LLC, 2010-12-01)
The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to assess the intrinsic uniformity of the calorimeter gaps and estimate its impact on the constant term of the energy resolution. The drift times of electrons in the cells of the second layer of the calorimeter are uniform at the level of 1.3% in the barrel and 2.8% in the endcaps. This leads to an estimat...
Comparison Of Formulae For Shear Strength Of Unsaturated Soils
Zehtab, Kaveh Hassan; Toker, Nabi Kartal; Ahmadiadli, Mohammad (2012-06-30)
During last 60 years many research studies have been conducted on calculation of shear strength of unsaturated soils and effects of matric suction on it. Several formulae are developed for predicting shear strength of unsaturated soils, based on strength tests on unsaturated soils. A variety of experimental techniques and laboratory equipment are used for unsaturated shear strength characterization. This study discusses the accuracy of shear strength prediction for unsaturated soils with three different for...
Trace metal composition of suspended particulate matter in the water column of the Black Sea
Yiğiterhan, O; Murray, J W; Tuğrul, Süleyman (Elsevier BV, 2011-09-20)
We analyzed the chemical composition of suspended matter from the Black Sea for a complete suite of elements used as tracers for various sources and processes. Samples of suspended matter were collected at four stations from the Bosporus to the center of the western gyre during a R/V Bilim cruise in September 2000. Sample depths were from the oxic surface layer, the suboxic zone and the upper part of the anoxic (sulfidic) layer. All samples were analyzed for Al, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Mo, Ag, Cd, Ba...
Citation Formats
S. Gokmen and O. Basturk, “Some remarks on the removal rates of H2S within the suboxic zone of the Black Sea,” 1997, vol. 47, p. 65, Accessed: 00, 2020. [Online]. Available: