A Direct Carrier Distillation Procedure for the spectrographic Determination of Impurities in Uranium Tetrafluoride

1974 ◽  
Vol 28 (6) ◽  
pp. 564-568 ◽  
Author(s):  
L. S. Dale
Keyword(s):  
Simultaneous Determination ◽  
Spectral Interference ◽  
Lead Chloride ◽  
Internal Standards ◽  
Spectrographic Determination ◽  
Uranium Tetrafluoride ◽  
Coefficients Of Variation ◽  
Wide Range ◽  
Determination Of Impurities

A direct carrier distillation procedure for the determination of a wide range of impurities in uranium tetrafluoride is described. The method is based on the use of lead chloride as carrier with yttrium oxide to suppress uranium spectral interference. A deep crater electrode further aids in the reduction of spectral interference. Germanium and cobalt are used as internal standards. The method has been adopted for the simultaneous determination of Ag, l, B, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, Si, Sn, Ti, V, and Zn with detection limits in the range 0.1 to 20 ppm and coefficients of variation ranging from 4 to 15%.

scholarly journals Spectrographic determination of boron and silicon in uranium tetrafluoride

1973 ◽  
Vol 263 (2) ◽  
pp. 128-128 ◽  
Author(s):  
F. A. Aldu�n ◽  
C. Capdevila ◽  
M. Roca
Keyword(s):  
Spectrographic Determination ◽  
Uranium Tetrafluoride

Determination of iV-Methylcarbamate Pesticides in Liver by Liquid Chromatography

1989 ◽  
Vol 72 (4) ◽  
pp. 586-592 ◽  
Author(s):  
Sher M Ali
Keyword(s):  
Liquid Chromatography ◽  
Simultaneous Determination ◽  
Fluorescence Detection ◽  
Methylene Chloride ◽  
Gel Permeation Chromatography ◽  
Purification Technique ◽  
Coefficients Of Variation ◽  
Gel Permeation ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method using a 2-step purification technique for the simultaneous determination of 10 carbamates in bovine, swine, and duck livers has been developed. Carbamates are extracted from liver samples with methylene chloride. After evaporation, the residues from the extract are dissolved in methylene chloride- cyclohexane (1 + 1) and cleaned up by gel permeation chromatography. The eluate containing carbamate residues is evaporated to dryness, reconstituted in methylene chloride, further purified by passing it through an aminopropyl Bond Elut extraction cartridge, and analyzed by liquid chromatography using post-column derivatization with orthophthalaldehyde and fluorescence detection. Excitation and emission are set at 340 and 418 nm, respectively. Liver samples for beef, pork, and duck were fortified with 5, 10, and 20 ppb of mixed carbamate standards. The average of 10 recoveries of 10 carbamates at all 3 levels of fortification was greater than 80% with coefficients of variation less than 17%.

Simultaneous determination of five sex hormones in human serum by radioimmunoassay after chromatography on Lipidex-5000.

1976 ◽  
Vol 22 (1) ◽  
pp. 32-38 ◽  
Author(s):  
D Apter ◽  
O Jánne ◽  
P Karvonen ◽  
R Vihko
Keyword(s):  
Menstrual Cycle ◽  
Human Serum ◽  
Simultaneous Determination ◽  
Sex Hormones ◽  
Oral Contraceptives ◽  
Light Petroleum ◽  
Serum Concentrations ◽  
Coefficients Of Variation ◽  
Normal Men

Abstract We describe a method for determination of pregnenolone, progesterone, 17alpha-hydroxyprogesterone, testosterone, and 5alpha-dihydrotestosterone in 1-2 ml of serum from male or female. Using microcolumns of Lipidex-5000 (hydroxyalkoxypropyl Sephadex, 0.5 g) and light petroleum/chloroform (97/3) as the solvent during chromatography, we resolved these five steroids into four fractions, with pregnenolone and 5alpha-dihydrotestosterone eluting together. By use of selected antibodies, the latter two steroids were also determined specifically. Use of microcolumns allowed minimization of solvent volumes and sample transfers. Consequently, blank values for all the five steroids were negligible. Lowest measureable concentrations (in ng/liter) were: pregnenolone 100, progesterone 25, 17alpha-hydroxyprogesterone 50, testosterone 25, and 5alpha-dihydrotestosterone 25. Intra-assay and inter-assay coefficients of variation ranged from 5 to 9% and 10 to 15%, respectively, for the five steroids. Serum concentrations of these steroids are given for women in the follicular and luteal phases of the menstrual cycle and for women on oral contraceptives of the combination type, as well as for normal men.

Liquid Chromatographic Determination of Simazine, Atrazine, and Propazine Residues in Catfish

1995 ◽  
Vol 78 (4) ◽  
pp. 1067-1071 ◽  
Author(s):  
David C Holland ◽  
Robert K Munns ◽  
José E Roybal ◽  
Jeffrey A Hurlbut ◽  
Austin R Long
Keyword(s):  
Ethyl Acetate ◽  
Petroleum Ether ◽  
Simultaneous Determination ◽  
Mobile Phase ◽  
Chromatographic Determination ◽  
Triazine Herbicides ◽  
Coefficients Of Variation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method is described for the simultaneous determination of the triazine herbicides, simazine (SIM), atrazine (ATZ), and propazine (PRO) in the 12.5–100 ppb range in catfish. The herbicides are extracted from catfish homogenates with ethyl acetate, followed by solvent partitioning between acetonitrile and petroleum ether and additional cleanup on a C18 cartridge. A Supelcosil LC-18-DB column is used for LC separation, and UV determination is at 220 nm. The isocratic mobile phase is a mixture of methanol, acetonitrile, and water. Mean recoveries from catfish were 88.7, 96.9, and 91.7%; standard deviations were 6.84,7.78, and 6.26%; and coefficients of variation were 7.72,8.03, and 6.82% for SIM, ATZ, and PRO, respectively.

scholarly journals Simultaneous determination of impurities in barium titanate by ICP-AES.

1986 ◽  
Vol 35 (8) ◽  
pp. 631-635 ◽  
Author(s):  
Yoshikazu YAMAMOTO ◽  
Takahiro AZUMA ◽  
Yoshinori NISHIMURA ◽  
Kazumasa UEDA
Keyword(s):  
Barium Titanate ◽  
Simultaneous Determination ◽  
Determination Of Impurities
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