ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1
    Electronic Resource
    Electronic Resource
    Kinetics of the stepwise oxidation of manganese(II) by peroxodiphosphate (PDP) in aqueous perchloric acid. Catalysis by silver(I) (1984)
    s.l. : American Chemical Society
    Inorganic chemistry 23 (1984), S. 3212-3216 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00188a036
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Colorimetric determination of microgram quantities of isonicotinic acid hydrazide (isoniazid) (1974)
    Springer
    Microchimica acta 62 (1974), S. 979-984 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die orange-gelbe Farbe des Vanadin(V)-Isoniazidkomplexes wird bei 420 nm (Filter Nr. 42) gemessen und dient zur kolorimetrischen Bestimmung von IsonikotinsÄurehydrazid bei pH 1,8–2,2. Zwischen 0,67 und 13,6 ppm ist das Beer'sche Gesetz erfüllt. Der Einflu\ von Substraten, die üblicherweise als ArzneimitteltrÄger dienen, wurde geprüft. Die Brauchbarkeit der Methode wurde an „Isokin“-Tabletten erprobt. Die Ergebnisse stimmen mit denen der offiziellen Methode der Brit. Pharmacop. gut überein.
    Notes: Summary The orange yellow colour of the vanadium(V)-isoniazid complex measured at 420 nm (Filter No. 42) is utilized as the basis for the colorimetric determination of isoniazid in the pH range 1.8 to 2.2. Beer's law is obeyed in the range 0.67–13.6 ppm. The influence of the substrates that are commonly employed as excipients in pharmaceutical preparations has been studied. The reliability of the method was tested by applying to the determination of isoniazid in “Isokin” tablets. Results are in good agreement with those obtained by the official B. P. method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01221875
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A new spot test for aromatic hydrazides using 2,3,5-triphenyl tetrazolium chloride (1975)
    Springer
    Microchimica acta 63 (1975), S. 237-241 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine Tüpfelreaktion mit 2,3,5-Triphenyltetrazoliumchlorid zum Nachweis von Benzoesäurehydrazid und dessenm- undp-Nitroderivaten, von Isonikotinsäurehydrazid, Salicylsäurehydrazid und Phenylessigsäurehydrazid wurde angegeben. 0,1 bis 0,2 ml einer 0,001% igen (bei Benzoesäurehydrazid einer 0,0001% igen) Lösung werden mit 0,2 bis 0,4 ml 0,02-m Natronlauge, 0,2 ml 1%iger Triphenyltetrazoliumchloridlösung und 0,2 ml Nitrobenzol oderi-Butylmethylketon in einem Mikroreagensglas behandelt. Rotbraune Färbung der organischen Phase zeigt die Anwesenheit eines aromatischen Hydrazids an. Die Nachweisgrenzen der angeführten Säurehydrazide in 1 ml Nitrobenzol betragen 0,2, 1,0, 1,0, 3,5, 3,0 bzw 2,0μg, in 1 mli-Butylmethylketon 0,2, 0,2, 0,1, 3,0, 0,2 bzw. 1,5μg Die störende Wirkung verschiedener Substanzen und Anionen wurde geprüft.
    Notes: Summary A spot test using 2,3,5-triphenyl tetrazolium chloride for the detection of benzoic acid hydrazide, and itsm- andp-nitro derivatives, isonicotinic acid hydrazide, salicylic acid hydrazide and phenylacetic acid hydrazide is described. The method consists of treating 0.1 to 0.2 ml of 0.001 % hydrazide (for benzoic acid hydrazide a 0.0001 %) solution with 0.2 to 0.4 ml of 0.02M sodium hydroxide, 0.2 ml of 1% 2,3,5-triphenyl tetrazolium chloride and 0.2 ml of nitrobenzene oriso-butyl methyl ketone in a micro test tube. A reddish-brown colour in the organic phase confirms the presence of an aromatic hydrazide. The identification limits for benzoic acid hydrazide, itsm- andp-nitro derivatives, isonicotinic acid hydrazide, salicylic acid hydrazide, phenylacetic acid hydrazide respectively are: 0.2, 1.0, 1.0, 3.5, 3.0, 2.0μg in 1 ml in nitrobenzene and 0.2, 0.2, 0.1, 3.0, 0.2, 1.5μg in 1 ml iniso- butyl methyl ketone. The interference of various substances and anions has been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01218611
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of oxidation of hydroxylamine by iron(III) in presence of 1,10-phenanthroline (1983)
    Springer
    Reaction kinetics and catalysis letters 23 (1983), S. 175-179 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Кинетика заглавной реакции была исследована спектрофотометрически в среде водной хлорной кислоты и в условиях [NH2OH]≫[Fe(III)]. Реакция имеет первый порядок как по железу(III), так и по субстрату. Увеличение [H+] бдиэлектрической постоянной среды уменьшает скорость реакции, в то время как ионная сила едва оказывает какое-либо влияние. Были получены кинетические доказательства существования комплеса между жепезом(III) и 1,10-фенантролином с составом 1∶2. Азот был основным продуктом окиления. Предлагается вероятный механизм протекания процесса.
    Notes: Abstract The kinetics of the title reaction was investigated spectrophotometrically in aqueous perchloric acid medium under isolated conditions, ([NH2OH]≫[Fe(III)]). The reaction was found to be first order in iron(III) as well as in the substrate. INcrease in the [H+] ion concentration of the medium were found to decrease the rate of the reaction, while ionic strength has little influence. Kinetic evidence for the formation of a 1∶2 complex between iron(III) and 1,10-phenanthroline has been obtained. Nitrogen was found to be the principal product of oxidation. A plausible mechanism consistent with the observed
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065685
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Oxidation of aroyl hydrazines, III. Kinetics and mechanism of the oxidation of nicotinoyl and isonicotinoyl hydrazine by iodine (1978)
    Springer
    Reaction kinetics and catalysis letters 9 (1978), S. 159-164 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Заглавная реакция была исследована в водной соляной кислоте при высоких концентрациях иодида. Реакуия имеет первый порядок как по окислителю, так и по субстрату, хотя ди-(изо) никотиноил гидразины являются продуктами, помимо азота. Реакцию значительно интибируют ионы H+ и I−. Наблюдалось также, что имеет место путь, независящий от ионов I−.
    Notes: Abstract The title reaction was studied in aqueous hydrochloric acid at high iodide concentations. The reaction is first order with respect to both oxidant and substrate though diisonicotinoyl hydrazines are the products apart from nitrogen. The reaction is markedly inhibited by H+ and I− ions. An I− ion independent path is also noticed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068917
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of oxidation of phenylacetic acid hydrazide by vanadium(V) (1980)
    Springer
    Reaction kinetics and catalysis letters 13 (1980), S. 7-12 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Изучено окисление гидразида фенилуксусной кислоты ванадием(V) в водной над-хлорной кислоте в присутствии 15% уксусной кислоты. Реакция протекает через про-межуточный комплекс окислитель-субстрат составном 1∶1. Предлогатся механизм, описывающий экспериментальные результаты.
    Notes: Abstract The title reaction was studied in aqueous perchloric acid medium in the presence of 15% acetic acid by volume. It was observed that the reaction proceeds via an intermediate 1∶1 oxidant-substrate complex. The reaction is inhibited by H+ ions. A mechanism consistent with the experimental results is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02077679
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Vanadametric determination of isonicotinic acid hydrazide using redox indicators and application to pharmaceutical preparations (1971)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 256 (1971), S. 360-361 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00537477
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Electrometric titration of hydrazine with cerium (IV) sulphate (1960)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 177 (1960), S. 36-41 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. A procedure has been developed for the determination of hydrazine in sulphuric acid solution by direct electrometric titration with cerium(IV) sulphate at 50–55° C using manganese(II) or chromium(III) sulphate as catalyst. The average CeIV-hydrazine ratio has been found to be 1.016. If the titre values are multiplied by the average correction factor of 0.985, one gets a correct assay of the hydrazine taken with an error of ±0.2%. The method now proposed has two advantages namely (1) that it is a direct procedure not involving the intermediate use of ferricyanide and (2) that the consumption of ceric sulphate is about a quarter of what is required in the existing methods involving the intermediate use of ferricyanide. Even in the direct bromate titration, the consumption of oxidant is four times of what it is in the procedure now recommended. 2. Other catalysts like iodine monochloride (in hydrochloric acid medium) osmic acid, silver sulphate, ferric sulphate and molybdic acid in sulphuric acid medium have been tried without success. 3. Titrations are not possible with a visual indication of the end point by the use of ferroin, n-phenyl anthranilic acid or triphenyl methane dyes as internal indicators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00466414
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    facet.materialart.
    Unknown
    Kinetics of the stepwise oxidation of manganese(II) by peroxodiphosphate (PDP) in aqueous perchloric acid. Catalysis by silver(I) (1984)
    American Chemical Society
    Details
    Publication Date: 1984-09-01
    Print ISSN: 0020-1669
    Electronic ISSN: 1520-510X
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Vanadametric determination of isonicotinic acid hydrazide using redox indicators and application to pharmaceutical preparations (1971)
    Springer
    Details
    Publication Date: 1971-10-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...