|
|
|
|
Acidic surface functional groups and mineral elements in Lakra coal (Sindh,Pakistan)
|
|
|
|
|
|
|
|
نویسنده
|
saeed k. ,ishaq m. ,ahmad i. ,shakirullah m. ,haider s.
|
|
منبع
|
journal of the chemical society of pakistan - 2010 - دوره : 32 - شماره : 2 - صفحه:162 -167
|
|
چکیده
|
Surface acidity of virgin coal (lakra sindh,pakistan) and variously extractcd/leached coal samples leached with hno3 naoh,and kmno 4,were investigated by aqueous potentiometric titration employing koh as a titrant. the titration curve of virgin coal showed that its surface might contain carboxyhc,carbonyl,phenolic and other weak acidic functional groups such as enols and c-h bond. the titration curves of leached coal samples showed inflections at ph 4-11,being not similar the inflections of carboxylic groups. this inflection might be given by functional groups like co2,phenolic,enols and c-h. mineral matter such as fe,k,zn,mn and ni were determined in the ash of coal by atomic absorption spectrophotometer and was found that fe (3104 μg/g) in the highest and ni (36.05 μg/g) in the lowest quantity is present in virgin coal sample,.
|
|
|
|
|
آدرس
|
department of chemistry,university of malakand,chakdara,dir (lower),n.w.f.p.,pakistan,institute of chemical sciences,university of peshawar,peshawar-25120, Pakistan, institute of chemical sciences,university of peshawar,peshawar-25120, Pakistan, institute of chemical sciences,university of peshawar,peshawar-25120, Pakistan, institute of chemical sciences,university of peshawar,peshawar-25120, Pakistan, institute of chemical sciences,university of peshawar,peshawar-25120, Pakistan
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Authors
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|