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  • Articles  (15)
  • spectrophotometry  (15)
  • Springer  (15)
  • American Institute of Physics
  • American Meteorological Society
  • American Physical Society (APS)
  • Elsevier
  • MDPI Publishing
  • Reed Business Information
  • 2010-2014
  • 1985-1989  (15)
  • 1955-1959
  • 1935-1939
  • 2012
  • 2010
  • 1989  (15)
  • Chemistry and Pharmacology  (15)
  • Law
  • Energy, Environment Protection, Nuclear Power Engineering
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  • Articles  (15)
Source
Keywords
Publisher
  • Springer  (15)
  • American Institute of Physics
  • American Meteorological Society
  • American Physical Society (APS)
  • Elsevier
    • +
Years
  • 2010-2014
  • 1985-1989  (15)
  • 1955-1959
  • 1935-1939
Year
Topic
  • Chemistry and Pharmacology  (15)
  • Law
  • Energy, Environment Protection, Nuclear Power Engineering
  • Biology  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of copper after adsorption of its 1-phenyl-4,4,6-trimethyl(1H, 4H)-pyrimidine-2-thiol complex onto microcrystalline naphthalene (1989)
    Springer
    Microchimica acta 97 (1989), S. 213-220 
    Details
    ISSN: 1436-5073
    Keywords: copper determination ; spectrophotometry ; 1-phenyl-4,4,6-trimethyl(1H, 4H)-pyrimidine-2-thiol ; microcrystalline naphthalene ; separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A selective Spectrophotometric method has been developed for the trace determination of copper after adsorption of its 1-phenyl-4,4,6-trimethyl(1H, 4H)-pyrimidine-2-thiol (PTPT) complex onto microcrystalline naphthalene. The complex is quantitatively adsorbed on naphthalene in the pH range 7.5–11.5, separated by filtration, dissolved in dimethylformamide (DMF) and determined spectrophotometrically at 400 nm. Beer's law is obeyed in the concentration range 2.5–37.5 μg of copper in 10 ml of DMF. The molar absorptivity and Sandell's sensitivity are 1.30 × 1041 · mol−1 · cm−1 and 0.0048βg cm−2, respectively. Ten replicate analyses of a solution containing 20.0 μg of copper gave a mean absorbance of 0.410 with a relative standard deviation of 0.91 %. The interferences of various ions have been studied and the method has been validated by the determination of copper in various standard reference materials, beers, wines, human hair, goat liver and environmental samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242467
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  • 2
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of some analgesic and anti-inflammatory agents with 3-methyl-2-benzothiazolinone hydrazone hydrochloride (1989)
    Springer
    Microchimica acta 97 (1989), S. 237-244 
    Details
    ISSN: 1436-5073
    Keywords: analgesic ; anti-inflammatory agent ; determination ; spectrophotometry ; MBTH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Simple and sensitive Spectrophotometric methods for the determination of pentazocine, naproxen, oxyphenbutazone, analgin, amidopyrine and mefenamic acid, based on the formation of a coloured species with MBTH on oxidation with Ce4+ or Fe3+, are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242470
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  • 3
    Electronic Resource
    Electronic Resource
    Spectrophotometric and first-derivative spectrophotometric determination of cadmium witho-hydroxybenzenediazoaminoazobenzene (HDAA) (1989)
    Springer
    Microchimica acta 97 (1989), S. 313-320 
    Details
    ISSN: 1436-5073
    Keywords: o-hydroxybenzenediazoaminoazobenzene ; cadmium determination ; spectrophotometry ; first-derivative spectrophotometry ; waste water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The synthesis ofo-hydroxybenzenediazoaminoazobenzene (HDAA) is described. Cadmium forms with HDAA in the presence of Triton X-100 a 1∶3 complex, which gives a maximum absorption at 520nm with an apparent molar absorptivity of 1.97 × 1051 · mol−1 · cm−1 in pH 10 borax buffer solution and 1.52 × 1051 · mol−1 · cm−1 in ammoniacal medium. In both media, Beer's law is followed in the range of 0 –10 μg of cadmium in 25ml of solution and the coefficients of variation do not exceed 1.5%. A derivative method has been employed to determine cadmium in certain waste water samples without separation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242253
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  • 4
    Electronic Resource
    Electronic Resource
    Improved method of sampling and determination of traces of hydrogen sulphide (1989)
    Springer
    Microchimica acta 98 (1989), S. 23-29 
    Details
    ISSN: 1436-5073
    Keywords: hydrogen sulphide ; spectrophotometry ; ion-pair ; trapping medium ; aerial oxidation ; tin(IV) hydroxide suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A sensitive spectrophotometric method for the determination of traces of hydrogen sulphide in environmental samples, after fixation as zinc sulphide, is reported. The method is based on the reaction between iodate and sulphide in the presence of excess of chloride ions. The resulting iodine chloride complex is ion-paired with Pyronine G and the product is extracted into benzene. The colour system obeys Beer's law over the range of 0.05–0.6 μg of hydrogen sulphide. The coefficient of variation is 6.3% for 10 determinations of 0.3 μg of hydrogen sulphide. The suitability of the method for monitoring hydrogen sulphide in atmospheric air in the vicinity of possible sources such as a sewage treatment plant and in wastewater has been evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244513
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  • 5
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of bromide (1989)
    Springer
    Microchimica acta 98 (1989), S. 145-148 
    Details
    ISSN: 1436-5073
    Keywords: bromide ; bromide in water ; spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A Spectrophotometric method for bromide determination has been developed. Bromide is converted to tribromide which absorbs at 267 nm. The detection limit is 0.01 μg/ml bromide. As little as 0.4 μg of bromide can be determined in an excess of chloride and sulfate with a coefficient of variation of 4%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244590
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of mercaptans in gasoline (1989)
    Springer
    Microchimica acta 99 (1989), S. 35-41 
    Details
    ISSN: 1436-5073
    Keywords: gasoline ; mercaptans ; thiols ; FIA ; spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In an r-FIA single-line manifold, 10-μl portions of 5,5′-dithiobis (2-nitrobenzoic acid) and 2% (v/v) ethylenediamine in 80 ∶ 20 inethanol: acetone are injected from pressurized containers via high-speed on/off valves into a flowing gasoline stream. The reaction product, 2-nitro-5-mercaptobenzoate, is detected optically at 412 nm after a reaction time of ∼15s. The system is intended for the measurement of mercaptans in the 0–2 mM (0–64 ppm S) concentration range. The response for C1–C10n-mercaptans ranges from 0.766–0.159 mAU/mM, the response to C1–C5n-mercaptans is 630 mAU/mM (±18.5% RSD). The response ratio of C1 and C5 mercaptans is 1 ∶ 0.653. The system permits extreme conservation of reagents; only 10 μl of each reagent is consumed per determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242787
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  • 7
    Electronic Resource
    Electronic Resource
    Oxidized haematoxylin, a new reagent for the spectrophotometric determination of penicillins and cephalosporins (1989)
    Springer
    Microchimica acta 97 (1989), S. 17-24 
    Details
    ISSN: 1436-5073
    Keywords: oxidized haematoxylin ; penicillins ; cephalosporins ; spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Haematoxylin—Chloramine-T in phosphate buffer (pH 7.0) is proposed as a new reagent for spectrophotometric determination of penicillins and cephalosporins in pure samples and pharmaceutical preparations. The method is based on acid hydrolysis of penicillins and cephalosporins with 5M HCl and subsequent treatment with oxidized haematoxylin. The resulting colour exhibits maximum absorption at 555 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197279
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  • 8
    Electronic Resource
    Electronic Resource
    Spectrophotometric studies on the platinum(IV)-prochlorperazine bismethanesulfonate complex (1989)
    Springer
    Microchimica acta 97 (1989), S. 129-136 
    Details
    ISSN: 1436-5073
    Keywords: plantinum(IV) complex ; prochlorperazine ; spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have studied the formation of a platinum complex and developed a simple, rapid and sensitive spectrophotometric method for the determination of platinum in solution. The method is based on the complexation reaction of the chromogen, prochlorperazine bismethane-sulfonate (PCPMS), with platinum(IV) in phosphoric acid medium which forms a reddish brown 1 ∶ 1 complex with an absorption maximum around 528 nm. The reaction is fast in the presence of copper(II) and goes to completion within 1 min. Beer's law is obeyed over the concentration range 0.3–7.2 μg/ml of platinum(IV) with an optimal range of 1.2–6.6 μg/ml. The molar absorptivity is 2.65 × 1041 mol−1 cm−1 and the Sandell's sensitivity is 7.8 ng cm−2. The stability constant, logK, of the complex is 4.96±0.1 at 25 ° C. The effects of time, temperature, concentrations of acids, PCPMS and copper(II), and the interference by various ions are investigated. The method has been successfully applied to the determination of platinum content in alloys and minerals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242459
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  • 9
    Electronic Resource
    Electronic Resource
    The reaction of Se(IV) with 2-aminodiphenylamine and its application to spectrophotometric determination of selenium in a strongly acidic medium (1989)
    Springer
    Microchimica acta 97 (1989), S. 337-347 
    Details
    ISSN: 1436-5073
    Keywords: 2-aminodiphenylamine ; selenium ; spectrophotometry ; kinetics of reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Se(IV) reacts with 2-aminodiphenylamine in perchloric, sulphuric or hydrochloric acid media to give the phenylbenzoselen-adiazolium cation. The optimum hydrogen-ion concentration ranges from about 0.1 to 5M. The molar absorptivity at λ=352 nm is 1.81×104 1 · mole−1 · cm−1. The product is extracted as an ion-association complex with perchlorate into a mixture of hexanol and chlorobenzene. The kinetics of the reaction was investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242256
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  • 10
    Electronic Resource
    Electronic Resource
    Indirect spectrophotometric determination of cyanide (1989)
    Springer
    Microchimica acta 98 (1989), S. 259-265 
    Details
    ISSN: 1436-5073
    Keywords: cyanide ; spectrophotometry ; indirect determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A spectrophotometric method for cyanide based on its inhibition of the colour formation reaction between nickel(II) and 3-(4′,5′-dimethyl-2′-thiazolylazo)-2,6-dihydroxybenzoic acid has been developed, and allows the determination of down to 0.1 μg of cyanide. Most of the interferences can be avoided by displacement of the hydrogen cyanide using an arsine generator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244602
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  • 11
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of iron in aluminium metal and some non-ferrous alloys (1989)
    Springer
    Microchimica acta 98 (1989), S. 267-276 
    Details
    ISSN: 1436-5073
    Keywords: iron determination ; spectrophotometry ; hematoxylin ; micelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, sensitive and selective spectrophotometric method is suggested for the determination of traces of iron(III) based on complex formation with hematoxylin in presence of cetyltrimethylammonium bromide (CTAB). Addition of CTAB shifted the absorption maximum of the iron-hematoxylin complex from 630 to 640 nm and increased its molar absorptivity from 9.88 × 104 to 1.16 × 105 1·mol−1·cm−1. The method adhered to Beer's law up to 0.4 and 0.2 μg/ml of iron in presence and absence of CTAB, respectively. The corresponding values of Sandell's sensitivity were 0.5 and 0.6 ng·cm−2. The effect of reagent and surfactant concentrations, pH and standing time were investigated. EDTA, tartrate and sodium fluoride were used as masking agents for most of the interfering ions. The method was successfully used for the determination of iron in aluminium metal and some non-ferrous alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244603
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  • 12
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of iron after separation of its 9,10-phenanthrenequinone monoximate on microcrystalline naphthalene (1989)
    Springer
    Microchimica acta 99 (1989), S. 17-23 
    Details
    ISSN: 1436-5073
    Keywords: iron determination ; spectrophotometry ; 9,10-phenanthrenequinone monoxime ; naphthalene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A sensitive and selective spectrophotometric method has been developed for the determination of iron as Fe(II) or Fe(III) using 9,10-phenanthrenequinone monoxime (PQM) as the complexing agent. Fe(II) and Fe(III) react with PQM to form coloured water insoluble complexes which can be adsorbed on microcrystalline naphthalene in the pH ranges 3.7–6.2 and 2.0–8.4, respectively. The solid mass consisting of the metal complex and naphthalene is dissolved in DMF and the metal determined spectrophotometrically by measuring the absorbances Fe(II) at 745 nm and Fe(III) at 425 nm. Beer's law is obeyed over the concentration range 0.5–20.0 μg of iron(II) and 20–170.0 μg of Fe(III) in 10 ml of DMF solution. The molar absorptivities are 1.333 × 104 1 · mole−1 · cm−1 for Fe(II) and 2.428 × 1031· mole−1 · cm−1 for Fe(III). The precision of determination is better than 1%. The interference of various ions has been studied and the method has been employed for the determination of iron in various standard reference alloys, bears, wines, ferrous gluconate, human hair and environmental samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242785
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  • 13
    Electronic Resource
    Electronic Resource
    Copper(II)-neocuproine as colour reagent for some biologically active thiols: Spectrophotometric determination of cysteine, penicillamine, glutathione, and 6-mercaptopurine (1989)
    Springer
    Microchimica acta 99 (1989), S. 143-146 
    Details
    ISSN: 1436-5073
    Keywords: thiols ; Cu(II)-neocuproine ; spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new direct spectrophotometric method is described for determination of μg/ml concentrations of four biologically important thiols: cysteine, penicillamine, glutathione, and 6-mercaptopurine. The method is based on reaction with copper(II)-neocuproine and subsequent measurement of the Cu(I)-neocuproine produced, at 458 nm. The method has been successfully applied to analysis for these thiols, with a relative standard deviation not exceeding 0.6%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242800
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  • 14
    Electronic Resource
    Electronic Resource
    Measuring plant protein with the Bradford assay (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 979-992 
    Details
    ISSN: 1573-1561
    Keywords: Soluble protein ; Coomassie brilliant blue G-250 ; binding ; leaves ; extraction ; spectrophotometry ; protein assay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The suitability of the Bradford protein assay for measuring plant protein was evaluated and a standard method developed. The assay involves extraction of dried, fresh, or frozen plant material in 0.1 NaOH for 30 min. Replicate 100-μl aliquots of centrifuged supernatant are assayed with 5 ml Bio-Rad Bradford dye reagent (Coomassie brilliant blue G-250) diluted 1:4 and containing 3 mg/ml soluble polyvinylpyrollidone. Absorbance at 595 nm is recorded after 15 min against an NaOH blank. Samples are calibrated against a ribulose 1,5-diphosphate carboxylase-oxygenase standard in NaOH. Procedures for plant preparation, extraction stability, the effects of phenol removal and quinone formation, and assay recovery are evaluated. Assay absorbance stability and techniques for increasing absorbance stability are reported. Changes in protein quality are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01015193
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  • 15
    Electronic Resource
    Electronic Resource
    Preferential inclusion of food colours via formation of their inclusion complexes withβ-cyclodextrin (β-CD) (1989)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 7 (1989), S. 321-325 
    Details
    ISSN: 1573-1111
    Keywords: β-Cyclodextrin (β-CD) ; food colours ; spectrophotometry ; reflectance spectra ; X-ray line diagrams
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The encapsulation of commercially utilized food colours withβ-cyclodextrin is reported. Thus, inclusion complexes of Sunset Yellow, Amaranth, Ponceau 4R, Carmoisine, Fast Red E, Tartrazine and Erythrosine withβ-CD were prepared. The formation of inclusion complexes was established by, among other methods, UV, reflectance and X-ray diffraction techniques. The host-to-guest ratio was determined by a UV spectral method. The effect of inclusion withβ-CD on binary mixtures such as Raspberry Red, Tomato Red and Orange Red was also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01076985
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