New perspectives in sulfur-iron cycling at the ocean- seafloor interface: The Black Sea sediments and deep-sea hydrothermal vents
Başlık çevirisi mevcut değil.
- Tez No: 400002
- Danışmanlar: PROF. DR. GEORGE W. LUTHER III
- Tez Türü: Doktora
- Konular: Deniz Bilimleri, Marine Science
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2009
- Dil: İngilizce
- Üniversite: Unıversıty Of Delaware
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
Speciation of sulfur and iron was investigated in the solid phase Black Sea sediments and high-temperature hydrothermal vent fluids of the 9°50?N East Pacific Rise and Lau Basin.Other than pyrite, solid phase sulfur in the upper Black Sea sediments existed as inorganic S(0) and acid-volatile sulfides (predominantly FeS) in the anoxic basin turbidites, and organic sulfur as humic sulfur in the uppermost 0-2 cm of the central basin sediments and as organic polysulfides in the sediments underlying suboxic waters. A 20 cm-thick turbidite in the surface of the western central basin was present as a result of a turbidity current triggered after the 1999 earthquakes in Northwestern Turkey, which transported reactive iron(III) and manganese(III, IV) oxides from southwestern shelf and slope sediments to the deep basin, oxidizing porewater sulfide to S(0).A mathematical model was designed to simulate the temporal changes in the Fe-S chemistry in the turbidite layer, and successfully showed that S(0) and solid phase reactive iron were still in the sediment long (5-8 years) after deposition of the turbidite. The turbidite-containing sediment column can serve as a sink for porewater sulfide for about 10 years. The results show that turbidites were a previously unrecognized sink for sulfide in the Black Sea and can account for 14% of the annual burial of sulfur.In addition to dissolved H2S/FeS, the hydrothermal vent sites had significant concentrations of dissolved (<200 nm) chromium-reducible sulfides (CRS), which constituted up to 11% of total dissolved sulfide. For >300°C vents, dissolved CRS is mostly made up of pyrite nanoparticles, which can constitute up to 10% of dissolved iron emanating from vents. At ambient seawater conditions, pyrite-Fe is oxidized slower than Fe2+ and FeS, thereby increasing the probability of Fe to be transported long distances into the deep ocean.
Benzer Tezler
- 2-(metiltiyo)kinolin grubu içeren yeni ftalosiyaninlerin sentezi ve karakterizasyonu
Synthesis and characterization of new phthalocyanines containing 2-(methylthio)quinoline group
MUSTAFA ALALOUSH
- Yeni kumarin ve oksihalohidrin türevlerinin sentezi, biyolojik ve fotofiziksel özelliklerinin incelenmesi
Synthesis of new coumarin and oxyhalohydrine derivatives and investigation of their biological and photophysical properties
FATMA ÇAKMAK
Doktora
Türkçe
2026
KimyaSakarya ÜniversitesiKimya Ana Bilim Dalı
PROF. DR. MUSTAFA ZENGİN
DOÇ. DR. ARLİNDA BYTYQİ DAMONİ
- Alternatif yakıtlarla deniz taşımacılığı dekarbonizasyonu
Decarbonization of shipping through alternative fuels
KÜBRA GÖKÇAY
Yüksek Lisans
Türkçe
2024
KimyaMarmara ÜniversitesiFizikokimya Ana Bilim Dalı
PROF. DR. GÖKÇEN ALEV ÇİFTÇİOĞLU
- Şarj edilebilir lityum-sülfür (Li-S) pillerde elektro eğirme yöntemi kullanılarak katot performansının geliştirilmesi
Improving cathode performance using electrospinning method in rechargeable lithium-sulfur (Li-S) batteries
FATİH ALTUN
Yüksek Lisans
Türkçe
2024
Mühendislik BilimleriMarmara ÜniversitesiMetalurji ve Malzeme Mühendisliği Ana Bilim Dalı
DOÇ. DR. MUSTAFA ŞENGÖR
DOÇ. DR. DAMLA EROĞLU PALA
- Yeni geliştirilen entegre bir sistemle kâğıt endüstrisinde proses içi su ve sülfür geri kazanımı
Sulfur and water recovery with a novel integrated system in-process treatment of pulp and paper industry wastewater
DOĞUKAN TUNAY
Doktora
Türkçe
2023
Çevre MühendisliğiYıldız Teknik ÜniversitesiÇevre Mühendisliği Ana Bilim Dalı
PROF. DR. BESTAMİ ÖZKAYA