Results 21 to 30 of about 27,262 (255)

Potentiometric Electronic Tongue for Pharmaceutical Analytics: Determination of Ascorbic Acid Based on Electropolymerized Films

open access: yesChemosensors, 2021
This work deals with the design of an experimental potentiometric electronic tongue (ET) for the recognition of various samples of effervescent tablets with different ascorbic acid (vitamin C) contents.
Gabriela Broncová   +2 more
doaj   +1 more source

Uncertainty evaluation of two titration methods for determination peroxide and acid value in edible oil

open access: yesShipin yu jixie, 2022
Objective: Two kinds of titration methods (automatic potentiometric titration and indicator titration) of GB 5009.229 and GB 5009.227 were used to analyze the expanded uncertaintyof the determination of acid value and peroxide value in edible oil ...
CHENG Hui, LIU Shun, GUAN Hong-xuan
doaj   +1 more source

Characterization of Shewanella oneidensis MtrC: a cell-surface decaheme cytochrome involved in respiratory electron transport to extracellular electron acceptors [PDF]

open access: yes, 2007
MtrC is a decaheme c-type cytochrome associated with the outer cell membrane of Fe(III)-respiring species of the Shewanella genus. It is proposed to play a role in anaerobic respiration by mediating electron transfer to extracellular mineral oxides that ...
AI Tsapin   +52 more
core   +1 more source

Effect of Grafted Hydroquinone on the Acid-Base Properties of Poly(acrylic acid) in the Presence of Copper (II)

open access: yesJournal of Chemistry, 2015
Potentiometric titration of poly(acrylic acid) and hydroquinone-functionalized poly(acrylic acid) was conducted in the presence of copper (II). The effects of hydroquinone functionalizing and copper (II) complexing on the potentiometric titration of poly(
Nabila Bensacia   +4 more
doaj   +1 more source

The Applicability Study for Determination of Fatty Acids in the Grain by Using Automatic Photometric Titration Method

open access: yesLiang you shipin ke-ji, 2020
A fatty acid value determination method in grain was developed by using automatic photometric titrator with KOH as standard titration solution in this paper, in which magnetic stirring apparatus was selected as extraction device, anhydrous ethanol was ...
LI Wei-xiang   +3 more
doaj   +1 more source

The oxalato complexes of titanium(IV)—I : Mononuclear Ti(OH)2(C2O4)22− in solution [PDF]

open access: yes, 1977
Molecular weight, electrodialysis and anion exchange measurements between pH 1 and 4 showed that the titanyl oxalate anion is present in solution as mononuclear Ti(OH)2(C2O4)22 units. pH studies of solutions of (NH4)2TiO(C2O4)2·H2O in 0.5 M NaClO4 medium
Velde, G.M.H. van de
core   +2 more sources

Detection of protein concentrations using a pH-step titration method [PDF]

open access: yes, 1997
A stimulus-response method based on the application of a pH step is proposed for the detection of protein immobilized in a membrane on top of an ion-sensitive field-effect transistor (ISFET). The ISFET response to a step-wise change in pH, applied at the
Bergveld, P., Eijkel, J.C.T., Kruise, J.
core   +3 more sources

Changes of pore structure and chloride content in cement pastes after pore solution expression [PDF]

open access: yes, 2020
Pore solution expression is a widely accepted approach to extract pore solution of cement-based materials by appllying high pressure. In this study, the variations of pore solution distribution and chloride content in cement pastes before and after pore ...
De Schutter, Geert   +4 more
core   +2 more sources

Development of novel redox systems in potentiometry and its application to analytical chemistry [PDF]

open access: yes, 1996
Potentiometric methods (potentiometry) embrace two types of analyses. One is known as analysis by direct potentiometric measurement using a pH glass electrode and/or an ion-selective electrode. The other type is potentiometric titration.
Teshima Norio, 手嶋 紀雄
core   +1 more source

Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto Acid/base and complexation properties of humic and fulvic acids isolated from vermicompost

open access: yesQuímica Nova, 2007
Proton binding properties of humic and fulvic acids were studied by potentiometric titration. Carboxylic groups were the predominant ionizable sites in comparison to phenolic and amine groups.
Sandro de Miranda Colombo   +3 more
doaj   +1 more source

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