1. |
Reference Electrodes in Dimethylformamide |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1357-1370
AssisV. Benedetti,
CecÍLioS. Fugivara,
MÁRio Cilense,
Tibor Rabockai,
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摘要:
An investigation of an Ag/Ag+reference electrode in dimethylformamide solution is reported. Simple preparation, fast response and high exchange current density characterize this reference electrode. The stability of the electrode with time and its temperature coefficient were also studied.
ISSN:0003-2719
DOI:10.1080/00032718308065250
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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2. |
1,4,7,10-Tetraoxacyclododecane(12-Crown-4) as Neutral Carrier for Lithium Ion in Lithium Ion Selective Electrode |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1371-1380
V.P. Y. Gadzekpo,
G.D. Christian,
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摘要:
1,4,7,10-Tetraoxacyclododecane (12-crown-4) (I) and its lithium complex (II) are used as neutral carriers for lithium ion in polyvinylchloride membrane ion selective electrodes. The lithium response varies with concentration, being near Mernstian at low (10−5-10−4M) concentrations and sub-Nernstian (24-28 aV) at higher concentrations (10−3M). The selectivity coefficients KLiPotMfor II are: Na+(0.12), K+(0.66), Cs+(0.15), Mg2+(1.6 × 10−4), Ca2+(3.1 × 10−4), Ba2+(9.5 × 10−7), NH+4(9.0 × 10−2), H+(2.2).
ISSN:0003-2719
DOI:10.1080/00032718308065251
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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3. |
A Complexo-Ion Exchange Method for the Specific Detection of Iron on Zirconium (IV) Arsenophosphate Beads |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1381-1392
K.G. Varshney,
Sanjay Agrawal,
Kanak Varshney,
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摘要:
A highly sensitive and specific detection method has been developed for iron with a limit of detection ∼ 0.0001 mg per 0.02 ml on the beads of siroomium(IV) arsemophosphate cation exchanger, utilizing its adserptie-iem-exchange properties and the complex forming ability of 1, 10-phenanthroline. A mechanism has also been proposed tentatively on the basis of some experimental observations and theoretical considerations.
ISSN:0003-2719
DOI:10.1080/00032718308065252
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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4. |
Polyamide-Coated Open- Tubular Micro-Capillary Column for Liquid Chromatography |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1393-1402
Hiroo Wada,
Souji Rokushika,
Hiroyuki Hatano,
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摘要:
An open-tubular micro capillary column was prepared by coating the inner wall of a pyrex tube (50 μm i.d.) with polyamide. Chromatographic behaviors of trace amounts of various phenolic compounds, benzoic acid derivatives and aromatic amino and nitro compounds, were examined on this column.
ISSN:0003-2719
DOI:10.1080/00032718308065253
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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5. |
β-Naphthol as a Chromophore and Fluorophore Forming Reagent in the HPLC Determination of Alkyl Halides |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1403-1425
KennethW. Street,
Victoria Hocson,
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摘要:
A suitable chromophore- and fluorophore- forming reagent for the detection of alkyl halide water contaminants is β-naphtol. The ether derivatives are separated from each other and excess β-naphthol reagent by reverse, phase HPLC and are detected by ultraviolet absorption or fluorescence. A method for the determination of alkyl halides is presented. The method is applicable to concentration levels in the ppm range for UV detection and in the ppb concentration range using fluorescence detection.
ISSN:0003-2719
DOI:10.1080/00032718308065254
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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6. |
Spark Source Mass Spectrographic Analysis of Gallium Arsenide for Trace Oxygen and Carbon Using Liquid Helium Cryopumping |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1427-1434
D.C. Walters,
D.C. Look,
T.O. Tiernan,
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摘要:
A spark source mass spectrometric system has been developed for trace levels of oxygen and carbon in gallium arsenide using liquid helium cryopumping of the source chamber. Following bake-out, a collector positioned inside the source chamber is cooled using a controlled flow of liquid helium. Residual back-ground gases are more effectively removed than with liquid nitrogen and detectabilities of 0.02 ppma for oxygen and 0.05 ppma for carbon have been obtained. Routine analyses are carried out with a moderate consumption of liquid helium.
ISSN:0003-2719
DOI:10.1080/00032718308065255
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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7. |
Evaluation of a New Method for the Determination of Elements in Vegetable Foods and Feeds by Atomic Absorption Spectroscopy with Sampling of Carbonaceous Slurry |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1435-1447
F. Fagioli,
S. Landi,
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摘要:
The new method, proposed in a preceeding paper for the determination of elements in plant material by flame atomic absorption spectroscopy (FAAS) with liquid sampling of carbonaceous slurry, was tested on other kinds of organic material such as vegetable foods and feeds. Results are reported for the determination of calcium, magnesium, potassium, iron, manganese, zinc and copper in these materials. Also, the analytical results relative to the determination of cadmium by graphite-tube furnace atomic absorption spectroscopy (GTFAAS) for two matrices are given. In all cases accuracy and precision of the analytical procedure were ascertained.
ISSN:0003-2719
DOI:10.1080/00032718308065256
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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8. |
Extraction-Photometric Determination of Mn(II) with Isophtaldihydroxmic acid |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1449-1455
F. Salinas,
M. Jiménez-arrabal,
M.C. Nahedero,
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摘要:
In this paper a spectrophotometric method for the Mn(II) determination is proposed. This method is based on the extraction in toluenic Adogen 464 solution of the complex origined between Mn(II) and isophtaldihydroxamic acid. The method permits determination of 50-100 γ of Mn (II). The error and the molar absorptivity are values of 2.0% and 8.500 1. mol.−1.cm−1respectively. The interference levels caused by foreign ions are established. Also the standard line by extraction with ethylacetate Adogen 464 solution was studied.
ISSN:0003-2719
DOI:10.1080/00032718308065257
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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9. |
Quantitative Determination of Formaldehyde In Air Using the Acetylacetone Method |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1457-1468
Paul Bisgaard,
Lars Mølhave,
Bernd Rietz,
Peter Wilhardt,
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摘要:
The quantitative determination of formaldehyde in air using the fluorimetric acetylacetone method is described. Known concentrations of formaldehyde were generated and collected in water using abosorbers. The sampling rate was 0.5 1/min, and the sampling volumes varied from 2 to 20 1, depending on the concentration level. Under these conditions the entire sampling and the analytical method were evaluated over a range of 0.2–1.7 mg formaldehyde per m3of air.
ISSN:0003-2719
DOI:10.1080/00032718308065258
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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10. |
Substoichiometric Isotope Dilution Analysis of Sulphur in coal |
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Analytical Letters,
Volume 16,
Issue 17-18,
1983,
Page 1469-1484
DanielM. Downey,
GreggC. Huston,
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摘要:
Substoichiometric radioisotope dilution analysis has been applied to the determination of sulfur in coal. The experimental procedure involved the combustion of coal samples labelled with35S as sodium sulfate in a flowing oxýgen stream, collection of the combustion gases in hydrogen peroxide and substoíchiometric precipitation of barium sulfate. Samples of 0.2–10.0% sulfur were accurately determined with ±2% RSD by measuring the activity of the precipitates thus obtained and with comparison to standard samples carried through the same procedure. Analysis times of 15 minutes per sample were typical.
ISSN:0003-2719
DOI:10.1080/00032718308065259
出版商:Taylor & Francis Group
年代:1983
数据来源: Taylor
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