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
  • 1
    Electronic Resource
    Electronic Resource
    Amidine for extraction and spectrophotometric determination of niobium(V) in the presence of thiocyanate (1986)
    s.l. : American Chemical Society
    Analytical chemistry 58 (1986), S. 192-194 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00292a046
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Extraction and spectrophotometric determination of gold(III) by use of amides and amidines (1986)
    s.l. : American Chemical Society
    Analytical chemistry 58 (1986), S. 1547-1551 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00298a062
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Field determination of molybdenum in soils (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 355-356 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new procedure for the field characterization of the available amount of molybdenum in soil extract is described. It is based on the preconcentration of the Mo(V)-SCN– complex into toluene solution of N-octylacetamide (OAA) and subsequent heating of the extract for ≈ 10 min at 60° C over a water bath. The molar absorptivity of the complex is (3.50) × 104 1 mole–1 cm–1 at λmax 470 nm. The detection limit of the method is 4 ppb Mo. It provides a significantly increased tolerance limit for iron (up to 1000 ppm) and is applicable to the field characterization of Mo in soil extracts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050168
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Monomer-dimer equilibrium study of dichloroacetic acid in the vapor phase and in carbon tetrachloride solution (1978)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 82 (1978), S. 1018-1021 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100498a011
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Flow injection analysis of Zn and Co in beverages, biological, environmental and pharmaceutical samples (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 571-576 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, simple, rapid and selective flow injection analysis (FIA) method for the spectrophotometric quantification (speciation of inorganic and organic form) of Zn and Co with ammonium thiocyanate and malachite green (MG) in the presence of surfactants (CPC and TX-100) is described. The value of apparent molar absorptivity of the Zn- and Co- complexes are (1.23) × 104 and (8.67) × 103 L mol–1cm–1 at absorption maximum, 635 nm, respectively. The detection limit (amount causing a peak height 〉 3 s) is 15 ppb Zn and 20 ppb Co, whereas their optimum working ranges for the quantitative determinations are 0.05–2.0 ppm Zn and 0.07–2.5 ppm Co in the real samples. The sample thoughput of the method is 120 samples/h at the flow rate of 5.0 mL/min with rel. std. dev. of 〈 ± 1%. The method is free from interferences of almost all ions which are commonly associated with these metals in the complex materials. The composition of the complexes and their reaction mechanism involved are discussed. The effect of FIA and analytical variables for the determination of the metals are optimized. The method has been applied to the quantification of Zn and Co in beverages, biological, environmental, and pharmaceutical samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051126
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Graphite furnace-atomic absorption spectrophotometric determination of palladium in soil (2000)
    Springer
    Fresenius' journal of analytical chemistry 367 (2000), S. 738-741 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new and sensitive procedure for the graphite furnace-atomic absorption spectrophotometric (GF-AAS) determination of Pd in soil at nanogram level is described. The method is based on prior separation and enrichment of the metal as Pd(II)-SnCl3 –-N-butylacetamide (BAA) complex into 1-pentanol (PN) by solvent extraction method. The value of the molar absorptivity of the complex in three solvents, i.e. ethyl acetate, 1-pentanol, chloroform, lie in the range of (0.70–2.75) × 104 L mol–1 cm–1 at λmax 360–440 nm. The metal could be enriched into organic solvent, i.e. PN, up to 10-folds. The sensitivity (A = 0.0044) of the method in the term of the peak height was 0.5 ng Pd/mL of the aqueous solution at an enrichment factor (EF) of 5. Optimization of analytical variables during enrichment and GF-AAS determination of the metal are discussed. The method has been applied for the analysis of Pd to soil samples derived from roads and highways in Germany.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160000483
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Determination of antimony in rain water at the nanogram level with surfactant and brilliant green (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 270-272 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, simple, selective and sensitive method for the spectrophotometric determination of antimony in rain water is described. It includes preconcentrating Sb with surfactants (i.e. cetylpyridinium chloride (CPC) and Triton X-100 (TX-100)) into toluene and allowing the extract to react with a dye, i.e. brilliant green (BG). The value of apparent molar absorptivity is 5.55 × 105 L-mol–1· cm–1 at λmax = 620 nm; the detection limit is 3 ng/mL Sb in rain water at 3-fold preconcentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050689
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Extraction-spectrophotometric determination of uranium(VI) with PAR and N-octylacetamide (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 152 (1991), S. 243-249 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A new and simple method for selective spectrophotometric determination of uranium(VI) with 4-(2-pyridylazo)resorcinol (PAR) and N-octylacetamide into benzene over pH 7.0–9.0 is described. The molar absorptivity of the complex with 9 different amides is in the range of (0.40–3.2)·104 1·mol−1·cm−1 at the absorption maximum. Out of these, the most sensitive compound N-octylacetamide (OAA) was chosen for detailed studies in the present investigation. The detection limit of the method is 0.008 μg U·ml−1. The system obeys Beer's law in the range of 0–5 μg U·ml−1. The method is free from interferences of most of the common metal ions except vanadium(V) and copper(II), which are masked by proper masking agents. The composition of the complex is determined by curve-fitting method. The method has been applied for the recovery of the metal from rock samples and synthetic mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042158
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Selective and sensitive extraction-photometric determination of vanadium(V) withN-hydroxy-N-p- chlorophenyl-N'-(3-chloro-4-methylphenyl)-p-toluamidine in the presence of carboxylic acids (1979)
    Springer
    Microchimica acta 72 (1979), S. 53-61 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein einfaches, schnelles, empfindliches und hochselektives Verfahren zur Extraktion und photometrischen Bestimmung von Mikromengen Vanadin (V) wurde beschrieben. Es beruht auf der Bildung des Komplexes VO(OAm)2OH durch Umsetzung von V(V) mitN-Hydroxy-N-p-Chlorphenyl-N'-(3-Chlor-4-Methylphenyl)-p-Toluamidin und Extraktion als 1∶1-Addukt [VO(OAm)2OH∶L] mit verschiedenen Carbonsäuren in Chloroform (wobei HOAm=N-Hydroxyamidin und L=Carbonsäure). Die Art der Carbonsäuren hat großen Einfluß aufλ max undɛ der ternären Komplexe. Die Ausscheidereagenzien wie z. B. Oxal-, Bernstein-, Fumar-, Zitronen-, Weinsäure usw. werden auch als Synergisten bei der Extraktion von V(V) verwendet. Die molaren Extinktionen der Extrakte liegen zwischen 3100 und 6700 1 · Mob-1 · cm-1. Fe3+, Cu2+, Zn2+, Co2+, Ni2+, Cr3+, Mn2+, Ti4+, Zr4+, Mo6+ und W6+ stören nicht. Das Verfahren wurde auf verschiedene Legierungen angewendet.
    Notes: Summary A simple, rapid, sensitive and highly selective method for extraction-photometric determination of microamounts of vanadium(V) is described. The method is based on the formation of the VO(OAm)2-OH complex by the reaction of vanadium(V) withN-hydroxy-N-p-chlorophenyl-N'-(3-chloro-4-methylphenyl)-p-toluamidine, and its extraction into chloroform as 1∶1 adducts [VO(OAm)2OH∶L] (where HOAm=theN-hydroxyamidine and L=carboxylic acid) with various carboxylic acids. The nature of carboxylic acids has large effect in theλ max andɛ of ternary complexes. The sequestrating agents e. g. oxalic, succinic, fumaric, citric, tartraric acid have been also used as a Synergist in the extraction of vanadium(V). Apparent molar absorptivities of the extracts lie in the range of 3100–6700 l · mole−1 · cm−1. Fe3+, Cu2+, Zn2+, Co2+, Ni2+, Cr3+, Mn2+, Ti4+, Zr4+, Mo6+ and W6+ do not interfere. The method has been applied to various alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198048
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The extractive-photometric determination of Iron(III), vanadium(V) and molybdenum(V) as mixed complexes with thiocyanate and N-hydroxy-N-(p-chlorophenyl)-N′-(2,3-dimethylphenyl)-p-toluamidine hydrochloride (1979)
    Springer
    Microchimica acta 71 (1979), S. 353-360 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung N-Hydroxy-N-(p-chlorphenyl)-N′-(2,3-dimethylphenyl)-p-toluamidinhydrochlorid reagiert mit Fe(III), V(V) und Mo(V) in thiocyanathältigem Medium unter Bildung wasserunlöslicher, gemischter Komplexe, die sich mit Benzol extrahieren lassen. Die großen Unterschiede der für die Bildung dieser Komplexe erforderlichen analytischen Bedingungen bieten die Voraussetzung für eine einfache, rasche und empfindliche extraktions-photometrische Methode zur Bestimmung dieser Elemente im Mikrogramm-Maßstab. Cr(III), Mn(II), W(VI), Ti(IV) und Zr(IV) stören nicht. Das Verfahren wurde an Hand künstlicher Gemische erprobt.
    Notes: Summary N-Hydroxy-N- (p- chlorophenyl)-N′-(2,3-dimethylphenyl)-p-toluamidine hydrochloride reacts with Fe3+, V5+ and Mo5+ in thiocyanate media, giving water-insoluble mixed complexes, extractable into benzene. The large differences in the analytical conditions for formation of the mixed complexes of these elements affords a simple, rapid and sensitive extraction-photometric method for determination of these elements at microgram levels. Cr3+, Mn2+, W6+, Ti4+ and Zr4+ do not interfere. The method has been applied for determination of these elements in artificial mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197405
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...