Effect of NaCl and HCl concentrations on primary pH measurement for the certification of standard materials

Souza, Vanderléa de; Ordine, Alberto Pires; Fraga, Isabel Cristina Serta; Getrouw, Monique Audrey; Borges, Paulo Paschoal; Damasceno, J. C.; Couto, Paulo Roberto Guimarães

doi:10.1590/s1516-89132006000200013

Cited by 5 publications

(3 citation statements)

References 3 publications

(3 reference statements)

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“…Unless otherwise noted, all kinetic data were collected in the presence of excess supporting electrolyte, 1.0 M NaClO 4 , to mitigate migration effects at the electrochemical double layer . Although the pH values of buffered solutions with equimolar acid and conjugate base are expected to be equal to the p K a values of phosphate and borate (p K a of 7.2 and 9.2, respectively), the measured pH was lower in the presence of excess NaClO 4 , likely due to changes in activity coefficients at high ionic strength . Unless otherwise stated, all electrochemical experiments were conducted using a polycrystalline Au disk working electrode (geometric surface area 0.196 cm 2 ) rotated at 2500 rotations per minute (rpm).…”

Section: Resultsmentioning

confidence: 99%

Donor-Dependent Promotion of Interfacial Proton-Coupled Electron Transfer in Aqueous Electrocatalysis

et al. 2019

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Efficient interfacial electrocatalysis requires rapid concerted proton−electron transfer (CPET) at the electrode surface, a process for which there is little mechanistic understanding. In aqueous media, multiple proton donors coexist, adding to the mechanistic complexity. Herein, we examine the rate of the hydrogen evolution reaction (HER) on Au, a proxy for CPET to Au, as a function of the concentration of exogenous phosphate and borate proton donors. We find that the reaction order in phosphate is 0.6, whereas the reaction order in borate is close to 0, indicating that phosphate, unlike borate, can outcompete water as a proton donor for interfacial CPET. Promotion in phosphate is substantial; the rate of the HER on Au in saturated potassium phosphate at pH 6.8 is identical to the rate of the HER on Au at pH 1. Additionally, we demonstrate that buffer-promoted CPET is a phenomenon that extends beyond Au to an Earth-abundant catalyst, NiS x . Kinetic data indicate that interfacial CPET cannot be viewed as a simple bimolecular reaction between the donor and a surface site, but that it first requires the formation of a preassociation complex embedded in the double layer. Our results emphasize that both the proton donor and the donor's environment control the rate of interfacial CPET and consequently have profound effects on the rate of heterogeneous electrocatalysis.

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Section: Resultsmentioning

confidence: 99%

Donor-Dependent Promotion of Interfacial Proton-Coupled Electron Transfer in Aqueous Electrocatalysis

et al. 2019

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“…Indeed, the stomach thanks to the activity of the parietal cells secretes hydrochloric acid (HCl). The latter has a pH between 1 and 2 [10]. The amount of acid produced depends on the foods eaten, their quantities and is reduced in the event of an emptiness of the stomach.…”

Section: Resultsmentioning

confidence: 99%

“…The amount of acid produced depends on the foods eaten, their quantities and is reduced in the event of an emptiness of the stomach. Since the pH of caustic soda is basic (pH = 14) [10], it is neutralized by this gastric acidity of the stomach, which explains the rarity of gastro-pyloric lesions. In our case, the lack of financial means would be a factor favoring pyloric stenosis because the starving child has a less acidic pH which cannot buffer the soda ingested.…”

Section: Resultsmentioning

confidence: 99%

Double caustic, esophagic and pyloric stenosis post-ingestion of soda: Rare case

Yassegoungbe¹,

Guedenon²,

Metchihoungbe³

et al. 2021

World J. Adv. Res. Rev.

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The ingestion of caustic soda is frequently a source of complications. Esophageal stenosis remains among them the most frequent complication and by far the most formidable. Pyloric stenosis remains rare following ingestion of soda. We report through this clinical case, a cicatricial pyloric stenosis after ingestion of caustic soda associated with a stenosis of the esophagus having caused vomiting with the onset of severe malnutrition. The diagnosis was confirmed by the oeso-gastro-duodenal transit (OGDT) and the child underwent under general anesthesia an enlargement pyloroplasty according to Mikulicz initially and an esophageal dilation secondly to the candle of SAVARY. The postoperative follow-up was favorable with an improvement of the signs and a progressive postoperative weight gain after a follow-up of 06 months. The evolution was favorable after the monthly dilation sessions with a good resumption of transit.

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Integrated pH and Sodium Sensor Array Based on Iridium Oxide Film

Yang

Chiao

2018

2018 Ieee Sensors

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Effect of NaCl and HCl concentrations on primary pH measurement for the certification of standard materials

Abstract: pH is an important parameter to control the production of food

Cited by 5 publications

References 3 publications

Donor-Dependent Promotion of Interfacial Proton-Coupled Electron Transfer in Aqueous Electrocatalysis

Donor-Dependent Promotion of Interfacial Proton-Coupled Electron Transfer in Aqueous Electrocatalysis

Double caustic, esophagic and pyloric stenosis post-ingestion of soda: Rare case

Integrated pH and Sodium Sensor Array Based on Iridium Oxide Film

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