Enrichment and spectrochemical determination of volatile elements in tungsten oxide

1965 ◽  
Vol 210 (5) ◽  
pp. 339-344 ◽  
Author(s):  
Z. G. Hanna
Keyword(s):  
Tungsten Oxide ◽  
Volatile Elements

Graphenated polyaniline-doped tungsten oxide nanocomposite sensor for real time determination of phenanthrene

2014 ◽  
Vol 128 ◽  
pp. 138-148 ◽  
Author(s):  
Oluwakemi Tovide ◽  
Nazeem Jaheed ◽  
Nurali Mohamed ◽  
Ezo Nxusani ◽  
Christopher E. Sunday ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Real Time ◽  
Time Determination ◽  
Nanocomposite Sensor

scholarly journals Chemical profile and antimicrobial activity of extractable compounds of Betula litwinowii (Betulaceae) buds

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Valery A. Isidorov ◽  
Róża Bagan ◽  
Lech Szczepaniak ◽  
Izabela Swiecicka
Keyword(s):  
Antimicrobial Activity ◽  
Folk Medicine ◽  
Biologically Active ◽  
Chemical Profile ◽  
Active Components ◽  
Volatile Elements ◽  
Gram Positive Bacteria ◽  
History Of ◽  
Extractable Compounds

AbstractIn spite of the long history of therapeutic use of buds from different birch species in folk medicine the existing information on their chemical composition is insufficient. The main goal was to develop a method for GC-MS determination of the chemical profile of birch buds as well as their antimicrobial activity. 150 substances of different classes were identified in Betula litwinowii buds. The volatile elements of the buds were mainly represented by sesquiterpene compounds. Ether extracts also contained other biologically active components such as flavonoids and triterpenoids. However, a particular feature of this fraction was the high content of sesquiterpene phenylpropenoids, including esters of ferulic and caffeic acids with caryophyllene-type alcohols that had not been previously found in any biological samples. Apart from carbohydrates, a series of free amino acids were detected in methanol extracts. The antimicrobial activity of the ether extracts of the buds was observed against all of the microorganisms tested, with MIC values from 0.04 to 0.08 mg mL-1 for Gram-positive bacteria and Candida albicans. However, their inhibitory activities against tested Gram-negative bacteria were rather occasional.

General Spectrographic Technique for the Determination of Volatile Trace Elements in Silicates

1967 ◽  
Vol 21 (5) ◽  
pp. 282-285 ◽  
Author(s):  
W. C. Tennant
Keyword(s):  
Trace Elements ◽  
Internal Standard ◽  
Equal Weight ◽  
Volatile Elements ◽  
Bismuth Trioxide ◽  
Rare Elements ◽  
Careful Control ◽  
Dc Arc

Details are given of a quantitative dc-arc method for the determination of up to 15 volatile elements in trace amounts in silicates. Twenty milligrams of sample are mixed with an equal weight of an alumina-lime buffer containing 0.1% bismuth trioxide as internal standard and the mixture arced as the anode in a graphite cup. Careful control of arcing conditions allowed the determination of common volatile elements in amounts down to 1 ppm and in the case of several rare elements—notably Ag, Au, In, and Tl—down to 0.1 ppm.

Determination of Elements in Carbon Fiber Using Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

2013 ◽  
Vol 423-426 ◽  
pp. 767-770
Author(s):  
Ting Zhao ◽  
Ming Qiang Zhou ◽  
Wei Li Liu ◽  
Wei Huang ◽  
Jun Zhi He ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Carbon Fiber ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Volatile Elements ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Dry Digestion ◽  
Plasma Mass Spectrometry

Based on microwave digestion and dry digestion, the concentrations of Si, S, Ca, Cr, Fe, Ni, Cu, Al, Mo, Sb, Ti, V, Y and Zn in carbon fiber were determined using inductively coupled plasma mass spectrometry (ICP-MS). Compare with the concentrations in the solution got by microwave digestion, the concentrations in the solution got by dry digestion are higher. And microwave digestion is more suitable for treatment of carbon fiber containing volatile elements than dry digestion.

Sign in / Sign up

Export Citation Format

Share Document