THE DETERMINATION OF HEAVY WATER

A reasonably simple procedure for determining the concentration of heavy water solutions, based on the comparison of the vapor pressures of these solutions with pure water, has been developed. The method is useful for samples as small as 0.5 mgm. and the sample may be recovered. Individual determinations require about two hours. In the work reported, mean determinations did not vary from the best curve through the experimental points by more than 0.2 mole % of D2O, while the spread in any group of readings was about ±0.25 mole %.

Download Full-text

DETERMINATION OF LANTHANIDES AND 3D METALS IN ENDOMETALLOFULLERENES WATER SOLUTIONS BY X-RAY FLUORESCENCE SPECTROMETRY

EurasianUnionScientists ◽

10.31618/esu.2413-9335.2019.4.65.271 ◽

2019 ◽

Vol 4 (65) ◽

Author(s):

V.G Zinovyev. ◽

V.T. Lebedev ◽

I.A. Mitropolsky ◽

G.I. Shulyak ◽

P.A. Sushkov ◽

...

Keyword(s):

Fluorescence Spectrometry ◽

X Ray ◽

Water Solutions ◽

3D Metals

Download Full-text

ChemInform Abstract: NITROGEN-15 NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY. A SIMPLE PROCEDURE FOR DETERMINATION OF THE RATES OF NITROGEN-HYDROGEN PROTON EXCHANGE OF CIS- AND TRANS-1-AZA-2-CYCLONONANONE

Chemischer Informationsdienst ◽

10.1002/chin.197846079 ◽

1978 ◽

Vol 9 (46) ◽

Author(s):

I. YAVARI ◽

J. D. ROBERTS

Keyword(s):

Nuclear Magnetic Resonance ◽

Magnetic Resonance ◽

Magnetic Resonance Spectroscopy ◽

Nuclear Magnetic Resonance Spectroscopy ◽

Simple Procedure ◽

Proton Exchange ◽

Resonance Spectroscopy ◽

Cis And Trans ◽

Nuclear Magnetic

Download Full-text

Spectral determination of novel methacryloyl guanidine compounds in water solutions

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/675/1/012058 ◽

2019 ◽

Vol 675 ◽

pp. 012058

Author(s):

V A Tikhomirov ◽

D I Mendeleev ◽

V V Kurenkov ◽

M R Menyashev ◽

N A Sivov ◽

...

Keyword(s):

Spectral Determination ◽

Water Solutions

Download Full-text

Determination of heavy water by means of a thermal conductivity method

BUNSEKI KAGAKU ◽

10.2116/bunsekikagaku.7.301 ◽

1958 ◽

Vol 7 (5) ◽

pp. 301-304 ◽

Cited By ~ 1

Author(s):

Saburo YANAGISAWA ◽

Michiharu SEKI ◽

Yoshikazu WATANABE ◽

Shigeru NAKAMURA ◽

Fumio MORIYA

Keyword(s):

Thermal Conductivity ◽

Heavy Water ◽

Conductivity Method

Download Full-text

Growth kinetics of lithium formate crystals in normal and heavy water solutions

Journal of Crystal Growth ◽

10.1016/0022-0248(82)90167-1 ◽

1982 ◽

Vol 60 (1) ◽

pp. 14-20 ◽

Cited By ~ 13

Author(s):

J. Szewczyk ◽

J. Karniewicz ◽

W. Kolasiński

Keyword(s):

Heavy Water ◽

Growth Kinetics ◽

Water Solutions ◽

Lithium Formate ◽

Kinetics Of

Download Full-text

Residue Analysis of Organophosphorus and Organochlorine Pesticides in Fatty Matrices by Gas Chromatography Coupled with Electron-Capture Detection

Zeitschrift für Naturforschung C ◽

10.1515/znc-2006-5-607 ◽

2006 ◽

Vol 61 (5-6) ◽

pp. 341-346 ◽

Cited By ~ 7

Author(s):

Jae-Woo Park ◽

A. M. Abd El-Aty ◽

Myoung-Heon Lee ◽

Sung-Ok Song ◽

Jae-Han Shim

Keyword(s):

Gas Chromatography ◽

Electron Capture ◽

Simple Procedure ◽

Linear Regression Analysis ◽

Residue Analysis ◽

Electron Capture Detection ◽

Relative Standard ◽

Wide Range ◽

Repeatability And Reproducibility

A multiresidue method for the simultaneous determination of 22 organochlorine (OCs) and organophosphorus (Ops) pesticides (including isomers and metabolites), representing a wide range of physicochemical properties, was developed in fatty matrices extracted from meat. Pesticides were extracted from samples with acetonitrile/n-hexane (v :v, 1:1). The analytical screening was performed by gas chromatography coupled with electron-capture detection (ECD). The identification of compounds was based on their retention time and on comparison of the primary and secondary ions. The optimized method was validated by determining accuracy (recovery percentages), precision (repeatability and reproducibility), and sensitivity (detection and quantitation limits) from analyses of samples fortified at 38 to 300 ng/g levels. Correlation coefficients for the 22 extracted pesticide standard curves (linear regression analysis, n = 3) ranged from 0.998 to 1.000. Recovery studies from 2 g samples fortified at 3 levels demonstrated that the GC-ECD method provides 64.4-96.0% recovery for all pesticides except 2,4′-DDE (44.6-50.4%), 4,4′-DDE (51.1-57.5%) and 2,4′-DDT (50.0-51.2%). Both repeatability and reproducibility relative standard deviation values were < 20% for all residues. Detection limits ranged from 0.31 to 1.27 ng/g and quantification limits were between 1.04 and 4.25 ng/g. The proposed analytical method may be used as a simple procedure in routine determinations of OCs and Ops in meat. It can also be applied to the determination of pesticide multi-residues in other animal products such as butter and milk.

Download Full-text