نتایج جستجو برای: major ion chemistry

تعداد نتایج: 911280  

Journal: :iranian journal of environmental sciences 0
mukesh mahato department of environmental science & engineering, indian school of mines, dhanbad-826004, jharkhand, india prasoon singh department of environmental science & engineering, indian school of mines, dhanbad-826004, jharkhand, india abhay singh environmental management group, csir-central institute of mining and fuel research, dhanbad-826015, jharkhand, india ashwani tiwari department of environmental science & engineering, indian school of mines, dhanbad-826004, jharkhand, india

in the present study, 45 rainwater samples were collected from february to december 2012 on event basis in east bokaro coal mining environment. physico-chemical and major ionic compositions of rainwater samples as well as water soluble major ion composition were analyzed to employ principle component analysis for source identification. the average ph value was recorded 6.1 and varied from 5.1 t...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت معلم تهران - دانشکده علوم 1370

determination of uranium in natural water and complex solutions using ion exchange chromatography: a combined procedure using ion exchange chromatography and uv-vis spectrophotometry techniques has been developed to measure uranum in natural water and complex solutions. after conditicing , one hundred milli liters of sample solutions have been passed through an ion exchange column,pachked with ...

2010
Kang Xu

Since its appearance in 1991, the Li ion battery has been the major power source driving the rapid digitalization of our daily life; however, much of the processes and mechanisms underpinning this newest battery chemistry remains poorly understood. As in any electrochemical device, the major challenge comes from the electrolyte/electrode interfaces, where the discontinuity in charge distributio...

Journal: :Frontiers in bioscience 2013
Philip David Josephy Michael Novak

Aromatic and heterocyclic amines are a major class of chemical mutagens and carcinogens. The toxicity of these compounds is a consequence of their metabolic activation. The best-characterized enzymatic pathways for aromatic amine activation lead to the formation of reactive esters such as N-acetoxyarylamines, which are believed to be precursors of short-lived nitrenium ions. In the 1960s, nitre...

2000
Diethard K. Böhme

Flow-tube mass spectrometry as a technique to measure positive ion–molecule reactions is tracked from its birth to the beginning of the 21st century. Major achievements in the development and the application of this technique are surveyed. The instrumental developments that are considered include advances in ion production and selection, neutral introduction, temperature and energy control in t...

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