摘要:

A sensitive, rapid, and specific high pressure liquid chromatographic (HPLC) assay was developed for the determination of salicylic (SA) and salicyluric (SU) acids in plasma and urine. The compounds are extracted into ethyl ether at acid pH, evaporated, and reconstituted prior to instrumental separation. Overall recovery of both compounds is 90 ± 5%, and the sensitivity limits are 150 ng of SU and 300 ng SA per ml of biological fluid. The assay was used for the determination of both compounds in plasma and urine of man following oral doses of 40 mg/kg of sodium salicylate.

ISSN:0003-2719    

DOI:10.1080/00032717708059220

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

An electron capture gas chromatographic method utilizing a short glass column of 3% OV-210 at 155°C, has been developed for the direct quantitative determination of 3-oxocarbofuran (3, 3-dihydro-2,2-dimethyl-3-oxo-7-benzofurariyl N-methylcarbamate). The method is rapid, convenient, and does not require the formation of a derivative. Sensitivity permits the detection of quantities as low as 1 ppb in water samples. There was little response to 3-hydroxycarbofuran, 10 ng producing only a small peak. There was no response to carbofuran.

ISSN:0003-2719    

DOI:10.1080/00032717708059221

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The preparation of a low cost reverse phase preparative liquid chromatography system is described. The described system is capable of providing gram quantity scale-up from analytical reverse phase hplc systems. Load capacity is in the two gram range.

ISSN:0003-2719    

DOI:10.1080/00032717708059222

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The chemical ionization mass spectra of fluorescamine and fluorescamine - amino acid derivatives have been studied using methane and ammonia as reagent gases. Major ions in the spectra are protonated molecular ions, adduct ions and ions formed by loss of an oxygen atom.

ISSN:0003-2719    

DOI:10.1080/00032717708059223

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

NMR analytical procedures are described for the qualitative and quantitative determination of amygdalin. The spectrum is very specific for amygdalin, particularly the sugar region. The optical nature may be conveniently ascertained from the chemical shifts of the aglycone methine hydrogens and the relative optical purity determined by comparing the corresponding peak areas. Satisfactory analyses of amygdalin-containing tablets have been carried out with a precision of 1.2% and accuracy of less than 1%.

ISSN:0003-2719    

DOI:10.1080/00032717708059224

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

In the atomic absorption spectrophotometry of chromium with the air-acetylene flame, the absorption of chromium was increased by about 120% in the presence of sodium dodecyl sulfate (SDS) above the critical micelle concentration (CMC). This phenomenon was applied to overcoming interferences from many coexisting cations and some acids.

ISSN:0003-2719    

DOI:10.1080/00032717708059225

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

A cold vapor introduction system has been developed for the rapid detection of sub-nanogram amounts of mercury by plasma emission spectrometry. Operational parameters affecting response have been evaluated and optimum values are presented. The system appears to be free of spectral interferences. It has been applied to the analysis of marine sediments and organisms and coastal seawater.

ISSN:0003-2719    

DOI:10.1080/00032717708059226

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

A study has been made of the behavior of Be in solution during long term storage at low concentrations.

ISSN:0003-2719    

DOI:10.1080/00032717708059227

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Analytical methods are described for determining the concentration ratio of trioctylphosphine oxide (TOPO) and di(2-ethylhexyl)phosphoric acid (D2EHPA) in hydrocarbon solvents or in mixtures where the D2EHPA is the solvent. The Electron Spectroscopy for Chemical Analysis (ESCA) method was used to analyze the mixtures for the relative amounts of phosphine oxide-phosphorus to phosphoric acid-phosphorus as well as the variance with the mixture composition of the Ols/P2p signal intensity. The nmr signal strength of the protons of the oxymethylene group of the D2EHPA and the signal strength of the other protons of D2EHPA and TOPO were measured in solutions of varying concentrations of D2EHPA and TOPO. Mass spectral comparisons of the molecular ion strengths of TOPO and D2EHPA were also correlated with mixture composition.

ISSN:0003-2719    

DOI:10.1080/00032717708059228

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

An automatic analyzer for the simultaneous microdetermination of carbon, hydrogen, nitrogen, and sulfur is described. The method is based on the uncatalyzed, dynamic, flash-combustion of the sample in an oxygen/helium atmosphere in a quartz tube. Separation of the combustion gases, N2, CO2, SO2, and H2O is accomplished by using gas chromatography and a thermal conductivity detector. Reactions of SO2formation are given in detail.

ISSN:0003-2719    

DOI:10.1080/00032717708059229

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor