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  • Articles  (40)
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  • Articles  (40)
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  • 1
    Electronic Resource
    Electronic Resource
    Determination of thiabendazole residues in waters by solid-phase spectrofluorometry (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 1336-1339 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00058a007
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  • 2
    Electronic Resource
    Electronic Resource
    Spectrofluorimetric determination of traces of indium with 5-chiorosalicylidene-o-aminophenol (1991)
    Springer
    Microchimica acta 103 (1991), S. 303-310 
    Details
    ISSN: 1436-5073
    Keywords: 5-chlorosalicylidene-o-aminophenol ; indium determination ; spectro-fluorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A Spectrofluorimetric method for microdetermination of indium, based on the formation of a fluorescent 2∶1 (ligand:metal) complex between In (III) and 5-chlorosalicylidene-o-aminophenol at an apparent pH of 4.70 in an aqueous-ethanol medium (50% v/v ethanol) is proposed. The calibration graph is linear over the range 10.0–80.0 μg/l, the relative standard deviation 2.7% and the detection limit 1.5 μg/l. The method has been applied to the determination of indium in synthetic samples and natural waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243267
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of carbaryl in foods by solid-phase room-temperature phosphorimetry (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 307-312 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A phosphorimetric solid phase assay is proposed for the determination of the pesticide carbaryl (CBL) at room temperature. CBL was spotted on filter paper together with Tl(I) as heavy metal, and dried for 3 min, after which the diffuse transmitted phosphorescence was measured using two quartz plates to avoid the quenching effect produced by atmospheric oxygen. The linear dynamic range was 0.5–4.0 μg/mL and the detection and quantification limits were 0.09 and 0.31 μg/mL, respectively. The precision of the method, expressed as relative standard deviation, was 2.3% for a sample containing 2.0 μg/mL of CBL. The method was applied to the determination of CBL residues in cereals, potatoes and waters, obtaining recoveries ranging between 92 and 105%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051079
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  • 4
    Electronic Resource
    Electronic Resource
    Flow injection analysis with in-line solid phase extraction for the spectrophotometric determination of sulfonated and unsulfonated Quinoline Yellow in Cologne (2000)
    Springer
    Fresenius' journal of analytical chemistry 367 (2000), S. 672-676 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An integrated solid-phase spectrophotometry/ FIA  method is  proposed for the determination of the synthetic colorant matter Quinoline Yellow (QYWS) in the presence of its unsulfonated derivative QYSS. The procedure is based on the retention and preconcentration of the low level QYSS on a C-18 silica gel minicolumn, followed by sequential measurement of its absorbance at λ = 410 nm after its elution with methanol. The applicable concentration range, the detection limit and the relative standard deviation were the following: for QYWS, from 0.10 to 30.0 mg L–1; 0.013 mg L–1; and 0.6%; and for QYSS, between 10 and 1,000 μg L–1; 2 μg L–1; and 1.3%, respectively. The method was applied to the determination of small amounts of QYSS present in QYWS in Colognes. Percentages of recovery between 98% and 99% were obtained in all instances. The method was also satisfactorily applied to the determination of these compounds in samples of commercial Colognes comparing the results for QYWS with those offered by an HPLC reference method and also validating the results chemometrically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160000437
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of Warfarin in Waters and Human Plasma by Solid-Phase Room-Temperature Transmitted Phosphorescence (1999)
    Springer
    Archives of environmental contamination and toxicology 37 (1999), S. 1-6 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. A new method for the determination of warfarin in waters and human plasma using solid-phase room-temperature phosphorescence is proposed. The sample was spotted on Whatman No. 4 filter paper, together with iodide and NaOH solutions, after which it was dried and its transmitted phosphorescence intensity measured at 467 nm using two quartz plates to avoid the quenching effect produced by oxygen. The applicable concentration range went from 0.3 to 4.0 mg · L−1, and the detection and quantification limits were 0.08 and 0.28 mg · L−1 respectively. The precision of the method, as a relative standard deviation, was 2.3%. The method was applied in the determination of warfarin in human plasma and different types of water. The interferences produced by the albumin of the human plasma were eliminated by the addition of Na2SO4 saturated solution. Recoveries ranging between 93.0 and 109.0% in the case of water samples, and between 95.0 and 103.0% in the case of human plasma, were obtained. These results were compared with the results obtained by other methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900483
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of nitrite in sea-water by ion-exchanger colorimetry (1984)
    Springer
    Microchimica acta 84 (1984), S. 303-311 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine Mikromethode zur Bestimmung von Mikrogramm Nitrit/Liter mit Hilfe der lonenaustausch-Kolorimetrie wurde ausgearbeitet. Zu diesem Zweck wird Nitrit mit Sulfanilamid und N-(1-Naphthyl)ethylendiamin zu einem Azofarbstoff umgesetzt, der an Dowex 50W-X2 adsorbiert wird. Die Absorbanz der Harzphase wird unmittelbar bei 550 und 800 nm gemessen. Die relative Nachweisgrenze beträgt 0,27μg/l, das Verteilungsverhältnis 2,6×104. Das Verfahren wurde zur Bestimmung von Nitrit in 500-ml-Proben Meerwasser verwendet und mit konventionellen Methoden verglichen.
    Notes: Summary A microdetermination method (at theμg/l level for nitrite) has been developed, based on ion-exchanger colorimetry. The nitrite is reacted with sulphanilamide andN-(1-naphthyl)ethylenediamine to form an azo dye which is then sorbed on Dowex 50W-X2. The resin phase absorbance at 550 and 800 nm is measured directly. The relative detection limit is 0.27μg/l and the distribution ratio is 2.6×104. The method has been applied to determination of nitrite in 500-ml sea-water samples and compared with a conventional technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212395
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of thiabendazole in foods and waters by solid-phase transmitted room-temperature phosphorescence (1999)
    Springer
    Microchimica acta 130 (1999), S. 273-279 
    Details
    ISSN: 1436-5073
    Keywords: room temperature phosphorescence ; thiabendazole determination ; waters analysis ; foods analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new method for the determination of thiabendazole (TBZ) is proposed, based on enhanced native phosphorescence at room temperature when the pesticide is fixed on paper and using Pb (CH3-COO)2 as the enhancer. The sample and enhancer solutions were deposited on a slip of paper (Whatman No. 4), previously humidified with pH 4.0 acetic/acetate buffer solution, after which the paper was dried and placed between two quartz plates. The diffuse transmitted phosphorescence intensity was measured directly at λex = 303 nm and λem = 472 nm. The applicable concentration range was 160.0–1200.0 ng/ml, with a relative standard deviation of 1.2%. The detection and quantification limits were 47.7 and 158.9 ng/ml, respectively. This simple method was used to measure the levels of this pesticide in potatoes, green beans, lettuce and different types of waters, showing good selectivity in all instances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242916
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of pyrene and benzo(a)pyrene residues in water by derivative synchronous solid-phase spectrofluorimetry (1993)
    Springer
    Microchimica acta 112 (1993), S. 55-62 
    Details
    ISSN: 1436-5073
    Keywords: benzo(a)pyrene ; pyrene ; solid-phase spectrofluorimetry ; water analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Benzo(a)pyrene (BaP) and pyrene (Pyr) are two polycyclic aromatic hydrocarbons (PAHs) showing native fluorescence in solution. Both compounds have been determined in water at trace levels by solid-phase spectrofluorimetry, in which BaP and Pyr are fixed on Sephadex G-25 gel and the relative fluorescence intensity is measured after the system is packed in a 1-mm silica cell. First-derivative synchronous spectra obtained at Δλ=38 nm were used to determine BaP and Pyr in the presence of other potentially interferent PAHs. The spectral characteristics of the PAHs-gel system are described, the applicable concentration ranges being 0.4–2.5 ng/ml for BaP and 0.7–4.5 ng/ml for Pyr. The relative standard deviations were 1.1% and 1.4% for BaP and Pyr respectively. The detection limits were 0.04 ng/ml for BaP and 0.1 ng/ml for Pyr. The method was applied to the analysis of both compounds in water at trace levels and a recovery study on tap, natural and sea waters was carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243321
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  • 9
    Electronic Resource
    Electronic Resource
    Simultaneous determination of benomyl and morestan residues in waters by synchronous solid-phase spectrofluorimetry (1995)
    Springer
    Journal of fluorescence 5 (1995), S. 225-229 
    Details
    ISSN: 1573-4994
    Keywords: Benomyl and morestan determination ; solid-phase spectrofluorimetry ; pesticides residues ; water analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper a new, sensitive, and simple method for simultaneous determination of pesticides morestan and benomyl at trace levels in waters is reported. Both chemicals, showing native fluorescence in solution at neutral medium, were fixed on C-18 silica gel at pH 1, giving a fluorescent system. The benomyl-morestan-silica gel system, after dry, was packed in a 1-mm silica cell and its synchronous fluorescence spectra were recorded at δλ=80 nm for determination of benomyl and δλ=25 nm for determination of morestan. Measurements of fluorescence were performed at λ1=289 nm and λ2=367 nm for benomyl and morestan analysis, respectively. The applicable concentration ranges were from 0.5 to 15.0 ng·ml−1 for benomyl and from 0.6 to 15.0 ng·ml−1 for morestan, with relative standard deviations of 1.2 and 1.5% for benomyl and morestan, respectively, being 0.15 and 0.18 ng·ml−1 its respective detection limits. The method was applied to the simultaneous determination of residues of both pesticides in water of different provenances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727543
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of tungsten with pyrocatechol violet by first-derivative solid-phase spectrophotometry (1994)
    Springer
    Microchimica acta 112 (1994), S. 225-235 
    Details
    ISSN: 1436-5073
    Keywords: solid-phase spectrophotometry ; derivative spectrophotometry ; pyrocatechol violet ; tungsten determination ; natural and industrial waters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Derivative spectrophotometry was applied to solid-phase spectrophotometry in order to enhance its sensitivity and remove the large background caused by the absorbance of the resin layer. Determination of micro-amounts of tungsten with pyrocatechol violet to form a 2∶1 green complex in acid medium which is fixed on a dextran-type anion-exchange resin (Sephadex QAEA-25) is described as an example for the application of this technique. The absorbance of the resin packed in a 1-mm spectrophotometric cell, was measured directly. The characteristic peak amplitude of the signal at 674 nm in the first-derivative spectrum is useful for quantitative determination of tungsten (3–16 μg 1−1; RSD 5.8%) in natural and industrial water samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242838
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