نتایج جستجو برای: bromine
تعداد نتایج: 2325 فیلتر نتایج به سال:
[1] Measurements of BrO suggest that inorganic bromine (Bry) at and above the tropopause is 4 to 8 ppt greater than assumed in models used in past ozone trend assessment studies. This additional bromine is likely carried to the stratosphere by short-lived biogenic compounds and their decomposition products, including tropospheric BrO. Including this additional bromine in an ozone trend simulati...
Reconstructing the past variability of Arctic sea ice provides an essential context for recent multi-year sea ice decline, although few quantitative reconstructions cover the Holocene period prior to the earliest historical records 1,200 years ago. Photochemical recycling of bromine is observed over first-year, or seasonal, sea ice in so-called "bromine explosions" and we employ a 1-D chemistry...
In an attempt to fractionate Cg acids produced by Ascaris with the aid of partition chromatography, it was noted that one fraction had distribution characteristics resembling those of n-valeric acid (2). Elution of this fraction began earlier than, but was completed simultaneously with, that of n-Valerie acid. Therefore, it appeared that this fraction may consist of at least two components. Evi...
1. An excretion balance study was performed following i.p. administration of 4-bromoaniline (50 mg kg(-1)) to bile-cannulated rats, using bromine-detected ((79/81)Br) ICPMS for quantification. Approximately 90% of the dose was recovered in urine (68.9 ± 3.6%) and bile (21.4 ± 1.4%) by 48 h post-administration. 2. HPLC-ICPMS ((79/81)Br) was used to selectively detect and profile the major urinar...
Mixed iodine-bromine perovskites used in solar cells undergo below a critical temperature an intrinsic demixing into phases with different compositions. In addition, under illumination they show nucleation of iodine-rich phase. We predict from thermodynamic considerations that mixed like $\mathrm{MAPb}{({\mathrm{I}}_{1\ensuremath{-}x}{\mathrm{Br}}_{x})}_{3}$ the interplay these effects can lead...
Bromine complexing agents (BCA) are used to improve the safety of aqueous bromine electrolytes versus outgassing in electrolytes. In this work, cycling performance hydrogen-bromine redox flow battery cells with 1-ethylpyridin-1-ium bromide ([C2Py]Br) as BCA a electrolyte theoretical capacity 179.6 A h L?1 is investigated for first time. The leads increased ohmic overvoltages. One cause drop can...
A number of methods are available for the quantitative estimation of cellulose in plant materials and have been reviewed by Doree (1933). Almost all of them are based upon the original procedure of Cross & Bevan (1903), who used chlorine gas for the removal of lignin as 'lignone chloride' followed by hot sodium sulphite extraction. Since then Jenkins (1930) and Norman & Jenkins (1933) have prop...
The springtime depletion of tropospheric ozone in the Arctic is known to be caused by active halogen photochemistry resulting from halogen atom precursors emitted from snow, ice, or aerosol surfaces. The role of bromine in driving ozone depletion events (ODEs) has been generally accepted, but much less is known about the role of chlorine radicals in ozone depletion chemistry. While the potentia...
Hydrogen-bromine (H2-Br2) redox flow batteries (RFBs) have gained a lot of interest due to their advantages in mitigating the performance shortcomings conventional zinc-bromine and vanadium batteries. Various carbon materials been tested H2-Br2 RFBs as bromine electrodes. However, comparative study among different has not reported literature. This work reports, for first time, an evaluation pap...
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