Indirect determination of zinc by thiol complexation and iodine coulometric titration with photocell detection

2017 ◽  
Vol 134 ◽  
pp. 119-124 ◽  
Author(s):  
Jeralyne B. Padilla Mercado ◽  
Dominik Konkolewicz ◽  
Stacey Lowery Bretz ◽  
Neil D. Danielson
Keyword(s):  
Coulometric Titration ◽  
Indirect Determination

Indirect determination of aluminum (III) in water samples by in-electrode coulometric titration

2021 ◽  
Vol 164 ◽  
pp. 106058
Author(s):  
Jakub Masac ◽  
Jan Lovic ◽  
Ernest Beinrohr ◽  
Frantisek Cacho
Keyword(s):  
Water Samples ◽  
Coulometric Titration ◽  
Indirect Determination

scholarly journals Volatile Alteration and Metamorphic Facies: Release of H2O and CO2 in the Panjal Volcanics of the NW Himalaya

1995 ◽  
Vol 11 ◽  
Author(s):  
David A. Spencer
Keyword(s):  
Oceanic Crust ◽  
Theoretical Calculations ◽  
Coulometric Titration ◽  
Direct Determination ◽  
Metamorphic Grade ◽  
Loss On Ignition ◽  
Indirect Determination ◽  
Dehydration Reactions ◽  
Eclogite Facies

Whilst the bulk rock geochemistry of a basalt, subjected to progressively increasing metamorphic grade, may remain on the whole isochemical, it has been long known that volatiles are likely to be released. Three volatiles which should change through an increase in metamorphic grade are H2O, CO2 and O2. The various metamorphic grades of the Panjal Volcanics in the NW Himalayas (unmetamorphosed, greenschist, amphibolite and eclogite facies) provide an ideal opportunity to test these ideas and possibly act as chemical indicators of the prograde metamorphism. Direct and indirect determination of CO2 and H2O were made on numerous samples. Direct determination of CO2 content in a rock sample has been made by coulometric titration for five main groups: Zanskar Tethyan Shelf - Panjal Volcanic basalts (Ba); Lesser Himalaya- Panjal Volcanic basalts (PJ); Higher Himalaya Second Cover - Panjal Volcanic amphibolites (A); Higher Himalaya Second Cover - Panjal Volcanic dolerites (D) and Higher Himalaya Second Cover - Panjal Volcanic eclogites (E). The main observation on the occurrence of % CO2 in the Panjal Volcanics with increasing metamorphic grade is that there is a decrease in CO2 that appears to be fairly gradual. This therefore suggests that with increasing metamorphism, CO2 is being driven off by decarbonation reactions. Estimation of the volatile content in a sample can be made by the simple2weight loss on ignition, and used as a method of indirect determination of H2O. The loss on ignition (L.O.I.) and the H2O (+ FeO) in the Panjal Volcanics show that with an increase in metamorphic grade there is a decrease in the L.O.I. and H2O (+ FeO) content. This therefore suggests that with increasing metamorphism, volatiles are being removed by dehydration reactions. Comparison of the results of this work with the results of some published theoretical calculations are made for the wt. % H2O of a subducting, and therefore dehydrating, oceanic crust or tholeiitic basalt. Here, predictions were made by combining calculated pressure - temperature paths with a model of metabasalt phase equilibria, where a progression (for the upper parts of the oceanic crust) pass through greenschist to amphibolite to eclogite facies. The agreement between these two independently produced sets of data is clearly apparent.

Indirect Determination of Amikacin by Gold Nanoparticles as Redox Probe

2020 ◽  
Vol 17 ◽  
Author(s):  
Mansureh Alizadeh ◽  
Mandana Amiri ◽  
Abolfazl Bezaatpour
Keyword(s):  
Gold Nanoparticles ◽  
Bacterial Infections ◽  
Limit Of Detection ◽  
Pharmaceutical Preparation ◽  
Cathodic Peak ◽  
Easy Method ◽  
Peak Current ◽  
Indirect Determination ◽  
Tract Infections

: Amikacin is an aminoglycoside antibiotic used for many gram-negative bacterial infections like infections in the urinary tract, infections in brain, lungs and abdomen. Electrochemical determination of amikacin is a challenge in electroanalysis because it shows no voltammetric peak at the surface of bare electrodes. In this approach, a very simple and easy method for indirect voltammetric determination of amikacin presented in real samples. Gold nanoparticles were electrodeposited at the surface of glassy carbon electrode in constant potential. The effect of several parameters such as time and potential of deposition, pH and scan rates on signal were studied. The cathodic peak current of Au3+ decreased with increasing amikacin concentration. Quantitative analysis of amikacin was performed using differential pulse voltammetry by following cathodic peak current of gold ions. Two dynamic linear ranges of 1.0 × 10−8–1.0 × 10-7 M and 5.0 × 10−7–1.0 × 10-3 M were obtained and limit of detection was estimated 3.0× 10−9 M. The method was successfully determined amikacin in pharmaceutical preparation and human serum. The effect of several interference in determination of amikacin was also studied.

Determination of Some Nitrophenols by Atomic Absorption Spectrometry (AAS) After Extraction of Ionic Associates Involving the Bipyridylocopper(II) or Phenanthrolinocopper(II) Complex

1994 ◽  
Vol 59 (10) ◽  
pp. 2227-2234 ◽  
Author(s):  
Václav Stužka ◽  
Jaromír Souček
Keyword(s):  
Molecular Weight ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Methyl Isobutyl Ketone ◽  
Absorption Spectrometry ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Indirect Determination ◽  
Ionic Associates

A new method has been developed for the indirect determination of nitroso- and nitrophenols by atomic absorption spectrometry (AAS) after extraction of ionic associates involving bipyridylocopper(II) (CuDP) or phenanthrolinocopper(II) (CuPH) complexes. Nitrobenzene and methyl isobutyl ketone appeared to be suitable for the extraction. It was possible to determine several tenths to hundredths of a milligram of nitrophenol in a litre. Extractable associates with CuDP and CuPH are formed by phenols possessing two substituents or by higher molecular weight phenols such as naphthol or hydroxyquinoline. Monosubstituted phenols fail to form associates of this kind.

Acid Interferences in Indirect Determination of Silicon bt Atomic Absorption Spectroscopy (AAS)

1974 ◽  
Vol 7 (12) ◽  
pp. 627-635
Author(s):  
A. Radecki ◽  
H. Lamparczyk ◽  
J. Grzybowski ◽  
J. Halkiewicz
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Indirect Determination
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