نتایج جستجو برای: fe mn

تعداد نتایج: 109201  

2007
Shichun Huang Munir Humayun Frederick A. Frey

Precise Fe/Mn ratios and MnO contents have been determined for basalts from the Hawaiian shields of Ko’olau and Kilauea by inductively coupled plasma mass spectrometry. It is well known that the youngest Ko’olau (Makapu’u-stage) shield lavas define a geochemical endmember for Hawaiian lavas in terms of CaO and SiO2 contents and isotopic ratios of O, Sr, Nd, Hf, Pb, and Os. We find that their Mn...

In order to investigate the effect of micronutrients foliar application on seed yield and essential oil of black cumin, a field experiment was conducted based on Randomized Complete Block Design (RCBD) with three replications at the farmlocated in Naqadeh city, West Azerbaijan province, Iran, during 2015-2016 growing season. Treatments were separate application of Nano-Iron, Nano-Zinc and Nano-...

Journal: :Nanoscale 2016
Qusiy H Al-Galiby Hatef Sadeghi Laith A Algharagholy Iain Grace Colin Lambert

We investigated the thermoelectric properties of metalloporphyrins connected by thiol anchor groups to gold electrodes. By varying the transition metal-centre over the family Mn, Co, Ni, Cu, Fe, and Zn we are able to tune the molecular energy levels relative to the Fermi energy of the electrodes. The resulting single-molecule room-temperature thermopowers range from almost zero for Co and Cu ce...

1998
Umberto Piarulli Carlo Floriani Nazzareno Re Giuliana Gervasio Davide Viterbo

Homoleptic metal-sugar complexes were obtained in the form of MnIIand FeII-diacetoneglucose derivatives. The protolysis of [Mn3Mes6] and [Fe2Mes4] (Mes ) 2,4,6-Me3C6H2) with DAGH (1,2:5,6-di-O-isopropylideneR-D-glucofuranose, diacetoneglucose) led to [M(DAG)2] [M ) Mn (1), Fe (2)]. Although monomeric in solution, they showed a different degree of aggregation in the solid state, iron being monom...

Journal: :iranian journal of chemical engineering 0
behrang izadkhah department of applied chemistry and chemical engineering, university of tabriz, tabriz, iran. aligholi niaei department of applied chemistry and chemical engineering, university of tabriz, tabriz, iran. ali tarjomannejad department of applied chemistry and chemical engineering, university of tabriz, tabriz, iran. daryush salari department of applied chemistry and chemical engineering, university of tabriz, tabriz, iran.

in this paper, labo3 perovskite type catalyst formulations were prepared by sol-gel auto combustion method using citric acid as the fuel. activity of catalysts was tested in catalytic oxidation of toluene as a model of volatile organic compounds. lacoo3 perovskite formulation showed the highest activity among labo3 (fe, mn and co) perovskite catalysts. so, lacoo3 perovskite based catalyst was s...

Journal: :Water research 2014
Paul J Oberholster Po-Hsun Cheng Anna-Maria Botha Bettina Genthe

The metal bioaccumulation potential of selected macroalgae species at different pH ranges was study for usage as part of a possible secondary passive acid mine drainage (AMD) treatment technology in algae ponds. Two separate studies were conducted to determine the suitability of macroalgae for passive treatment when metabolic processes in macrophytes and microorganisms in constructed wetlands d...

2006
Matthew A. Marcus Alain Manceau Michael Kersten

The speciation of Mn, Fe, As and Zn in a fast-growing (0.02mm/yr), shallow-marine ferromanganese nodule has been examined by micro X-ray fluorescence, micro X-ray diffraction, and micro X-ray absorption spectroscopy. This nodule exhibits alternating Fe-rich and Mn-rich layers reflecting redox variations in water chemistry. Fe occurs as two-line ferrihydrite. The As is strictly associated with F...

Journal: :Journal of environmental quality 2005
H Tewolde K R Sistani D E Rowe

Analytically, poultry litter contains nearly all essential micronutrients but the extent of phytoavailability of these nutrients and whether cotton (Gossypium hirsutum L.) and other crop plants can receive adequate amounts of these nutrients from litter is not fully known. The objective of this research was to determine whether cotton receives sufficient amounts of Fe, Cu, Mn, and Zn from litte...

Journal: :Dalton transactions 2009
Anton S Lytvynenko Sergey V Kolotilov Olivier Cador Konstantin S Gavrilenko Stéphane Golhen Lahcène Ouahab Vitaly V Pavlishchuk

A first representative of coordination polymers, built from polynuclear carboxylate bridged by mononuclear carboxylate, has been synthesised and structurally characterized. The compound [{Fe(3)O(HCOO)(6)}{Mn(HCOO)(3)(H(2)O)(3)}].3.5HCOOH crystallised in the hexagonal system (space group P6(3)), a = b = 12.369(5) A, c = 12.992(5) A, alpha = beta = 90 degrees , gamma = 120 degrees , V = 1721.4(12...

ژورنال: علوم آب و خاک 2002
یحیی پرویزی, , عبدالمجید رونقی, , نجف ‌علی کریمیان, ,

Nitrogen is usually the most limiting nutrient for crop production. Manganese deficiency in some calcareous soils of Iran has been reported. The objective of this study was to evaluate the effect of N and Mn on the growth and chemical composition of spinach (Spinacia oleracea L.) under greenhouse conditions. The experiment was conducted in a soil from Chitgar series (Fine-loamy, carbonatic, the...

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