The Low Concentration Determination of Nitrous Oxide and Volatile Anaesthetics by Ftir Spectroscopy

The technique of Z-contrast in STEM offers the possibility to determine the local concentration of macromolecules like lipids, proteins or DNA. Contrast formation depends on the atomic composition of the particular structure. In the case of DNA, its phosphorous content discriminates it from other biological macromolecules. In our studies, sections of E. coli, the dinoflagellate Amphidinium carterae and Euglena spec. cells were used which were obtained by cryofixation followed by freeze-substitution into acetone with 3% glutaraldehyde. The samples were then embedded either in Lowicryl HM20 at low temperature or in Epon at high temperature. Sections were coated on both sides with 30Å carbon.The DF- and the inelastic image have been recorded simultaneously with a Cryo-STEM. This Cryo-STEM is equipped with a highly dispersive Electron Energy Loss Spectrometer. With this instrument pure Z-contrast can be achieved either with a Filtered DF-image divided by the inelastic image or, as is used in this paper, by dividing the conventional DF-image by an inelastic image which has been recorded with an inelastic detector whose response is dependent on the total energy loss of the inelastically scattered electrons.

Download Full-text

Comparison for Loss Rate of Low Concentration Nitrous Oxide in Tedlar Bag and Aluminium-Polyester Bag

Journal of Climate Change Research ◽

10.15531/ksccr.2017.8.1.31 ◽

2017 ◽

Vol 8 (1) ◽

pp. 31

Author(s):

Woo Chan Lee ◽

Sung Bin Park ◽

Young Hwan Ko ◽

Seung Min Hyun ◽

Kyoon Duk Yoon

Keyword(s):

Nitrous Oxide ◽

Loss Rate ◽

Low Concentration

Download Full-text

Petroleum products. Determination of low concentration of sulfur in automotive fuels. Energy-dispersive X-ray fluorescence spectrometric method

10.3403/30218053u ◽

2015 ◽

Keyword(s):

Petroleum Products ◽

Energy Dispersive ◽

Spectrometric Method ◽

X Ray ◽

Low Concentration ◽

Automotive Fuels

Download Full-text

Simultaneous Sorption of Chelates of Elements with Organic Reagents on Amberlite XAD-2 as a Preconcentration Step for the Emission Spectrometric Determination of the Elements

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19931821 ◽

1993 ◽

Vol 58 (8) ◽

pp. 1821-1831 ◽

Cited By ~ 1

Author(s):

Jaroslav Jambor ◽

Tomáš Javorek

Keyword(s):

Nitrous Oxide ◽

Argon Plasma ◽

Electric Arc ◽

Emission Spectrometry ◽

Organic Reagents ◽

Inductively Coupled ◽

Simultaneous Sorption

The macrophorous hydrophobic sorbent Amberlite XAD-2 proved to be well suited to the preconcentration of minority amounts of Al, Au, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sn, Ti and V in the form of their chelates with organic reagents. From among 14 reagents tested, 8-hydroxyquinoline and diethyldithiocarbamate appeared most suitable for the quantitative sorption up to level of 1 μg l-1 of analyte. Emission spectrometry served as the analytical finish; the nitrous oxide-acetylene flame, electric arc and inductively coupled argon plasma were chosen according to the nature of the element. The procedure is convenient for the determination of the minority analytes in waters

Download Full-text