Results 71 to 80 of about 1,141,580 (265)
Advanced Science, 2019 The ocean reserves 4.5 billion tons of uranium and amounts to a nearly inexhaustible uranium supply. Biofouling in the ocean is one of the most severe factors that hazard uranium extraction and even cause the failure of uranium extraction.
Qiuhan Yu +8 more
doaj +1 more source
The relationship between cellular protein content and selenium accumulation in freshwater microalgae
Integrated Environmental Assessment and Management, EarlyView.Abstract Variability in the bioconcentration of selenium (Se) by primary producers at the base of the food web results in uncertainty in predictions of bioaccumulation and ecological risk to higher trophic level organisms. Water chemistry, speciation of Se, and periphyton community composition have all been suggested as factors that contribute to ...
Courtney Bogstie +3 more
wiley +1 more source
The Behavior of Uranium in the Extraction with Benzyldodecylamine
Nippon kagaku zassi, 1961 アミン類は選択性の面で他の溶媒とくらべてすぐれているため,ウランの抽出に広く使用されている。このうちペンジル基をもつ第ニアミン類は高い抽出力をもち着目されているが,こめ種のアミン類による抽出の基礎が明らかでない。したがってベンジルドデシルアミンを使ってウランの抽出挙動および抽出機構を調べた。硫酸ナトリウム0.1～1.0mol/l,酸性度0.1～1.0Nの広い範囲でウランは1:1硫酸錯塩の形で実質上完全に有機層に抽出され,有機層内では抽出された硫酸ウラニル1分子についてベンジルドデシルアミンの4個が配位する。
openaire +2 more sources
Journal of the Chinese Chemical Society, EarlyView.While X‐ray crystallography has been the primary method for determining the structures of metalloproteins, cryoEM has taken over this role, illustrated by [4Fe4S]‐cluster containing proteins deposited in the Protein Data Bank. What will be the role for X‐ray crystallography as cryoEM and machine learning methods dominate the initial structural analysis?
Douglas C. Rees
wiley +1 more source
Successive Uranium and Thorium Separation from Leach Liquor of Ore Deposit of 5th Anomaly of Saghand by Solvent Extraction [PDF]
مجله علوم و فنون هستهای, 2014 The present work deals with successive uranium and thorium recovery from the sulfate leach liquor of the ore deposit of the 5th Anomaly of Saghand using liquid-liquid extraction technique, where trioctylamine (TOA) and di-(2-ethylhexyl) phosphoric acid ...
S A. Milani +2 more
doaj
Managing and visualising geochemical data for tephra correlation with the IntChron Integration Tool
Journal of Quaternary Science, EarlyView.ABSTRACT There is now a wealth of glass‐shard geochemical data for volcanic ash (tephra) layers from a wide range of volcanoes and eruptions, providing invaluable datasets for tephrochronology. However, compilation of published data to assess tephra correlations leads to large files and requires careful management.
Victoria C. Smith +5 more
wiley +1 more source
Modelling of Uranium Extraction in Sulphuric Medium [PDF]
, 2012 A cationic extractant, 2-ethyl hexylphosphonic acid (PC88A), has been studied to recover uranium from conventional ore by solvent extraction. On the basis of experimental studies, extraction equilibria for uranium in sulphuric medium with PC88A were ...
Sorel, C. +5 more
core +1 more source
Вестник КазНУ. Серия математика, механика, информатика, 2017 Sulfuric acid is extensively used in uranium production with In-Situ Leaching method. The influence of various components on the extraction degree has to be studied in order to optimize the solution spending and extraction degree of uranium.
M. B. Kurmanseiit +2 more
doaj
Uranium Extraction from Syrian Phosphate: A case Study [PDF]
International Journal of Economic and Environment Geology, 2010 Uranium and trace elements were studied in few hundred samples from phosphatic formations in Syria. Uranium and trace elements were enriched in phosphorites facies compared to carbonate and siliceous facies.
J.STAS, I. OTHMAN, M. ABBAS, H. SHLEWIT
doaj
Soil Contamination Around the Copper Smelter and the Use of Soil Microarthropods as Bioindicators
Land Degradation &Development, EarlyView.ABSTRACT Soil contamination from smelter emissions, including heavy metals (HM), rare earth elements (REEs), and sulfur, poses a significant threat to soil ecosystems. In the immediate vicinity of the Głogów Copper Smelter, HM concentrations were several times higher than in more distant forest stands.
Jacek Malica +10 more
wiley +1 more source