Electrochemistry of aqueous molybdenum(VI), -(V), and -(III) catechol complexes. Dimerization of molybdenum(V) in weakly acidic solution

1980 ◽  
Vol 19 (6) ◽  
pp. 1527-1532 ◽  
Author(s):  
Lynn M. Charney ◽  
Franklin A. Schultz
Keyword(s):  
Acidic Solution ◽  
Weakly Acidic Solution

Propagation of U(V)-reduction in the presence of U(IV) aggregate in a weakly acidic solution

2014 ◽  
Vol 141 ◽  
pp. 6-12 ◽  
Author(s):  
Yoshihiro Kitatsuji ◽  
Haruyoshi Otobe ◽  
Takaumi Kimura ◽  
Sorin Kihara
Keyword(s):  
Acidic Solution ◽  
Weakly Acidic Solution

scholarly journals A weakly acidic solution containing deoxycholic acid induces esophageal epithelial apoptosis and impairs integrity in an in vivo perfusion rabbit model

2016 ◽  
Vol 310 (7) ◽  
pp. G487-G496 ◽  
Author(s):  
Nicolas A. Pardon ◽  
Maria Vicario ◽  
Hanne Vanheel ◽  
Tim Vanuytsel ◽  
Laurens J. Ceulemans ◽  
...  
Keyword(s):  
Deoxycholic Acid ◽  
Acidic Solution ◽  
Rabbit Model ◽  
Esophageal Epithelium ◽  
Epithelial Integrity ◽  
Mucosal Integrity ◽  
Short Period ◽  
Weakly Acidic Solution

Impaired esophageal mucosal integrity may be an important contributor in the pathophysiology of gastroesophageal reflux disease (GERD). Nevertheless, the effect of potentially harmful agents on epithelial integrity is mainly evaluated in vitro for a short period of time and the possible induction of epithelial apoptosis has been neglected. Our objective was to assess the effect of an acidic and weakly acidic solution containing deoxycholic acid (DCA) on the esophageal epithelium in an in vivo rabbit model of esophageal perfusion and to evaluate the role of the epithelial apoptosis. The esophagus of 55 anesthetized rabbits was perfused for 30 min with different solutions at pH 7.2, pH 5.0, pH 1.0, and pH 5.0 containing 200 and 500 μM DCA. Thereafter, animals were euthanized immediately or at 24 or 48 h after the perfusion. Transepithelial electrical resistance, epithelial dilated intercellular spaces, and apoptosis were assessed in Ussing chambers, by transmission electron microscopy, and by TUNEL staining, respectively. No macroscopic or major microscopic alterations were observed after the esophageal perfusions. The acidic and weakly acidic solution containing DCA induced similar long-lasting functional impairment of the epithelial integrity but different ultrastructural morphological changes. Only the solution containing DCA induced epithelial apoptosis in vivo and in vitro in rabbit and human tissue. In contrast to acid, a weakly acidic solution containing DCA induces epithelial apoptosis and a long-lasting impaired mucosal integrity. The presence of apoptotic cells in the esophageal epithelium may be used as a marker of impaired integrity and/or bile reflux exposure.

Chlorsulfuron Adsorption by Humic Acid, Iron Oxides, and Montmorillonite

Weed Science ◽  
1988 ◽  
Vol 36 (4) ◽  
pp. 530-534 ◽  
Author(s):  
Ole K. Borggaard ◽  
Jens C. Streibig
Keyword(s):  
Humic Acid ◽  
Surface Charge ◽  
Surface Area ◽  
Iron Oxides ◽  
Acidic Solution ◽  
Background Electrolyte ◽  
Acid Base ◽  
Weakly Acidic Solution ◽  
Ph Conditions ◽  
Soil Constituents

An investigation of the adsorption of chlorsulfuron by four selected soil constituents, i.e. humic acid, two iron oxides, and montmorillonite, was carried out under concentration and pH conditions similar to those in most natural soils. CaCl2(0.01 M) was used as background electrolyte to suppress nonspecific adsorption. Negligible amounts of chlorsulfuron were adsorbed by montmorillonite, whereas humic acid and the iron oxides were found to be important adsorbents. For these adsorbents, chlorsulfuron adsorption decreased when pH increased from 4 to 8, with little adsorption occurring at pH 8. Adsorption by iron oxides was a function of their surface area. Chlorsulfuron adsorption was found to be closely related to the surface charge of the adsorbents, but in weakly acidic solution, also to the acid-base properties of chlorsulfuron itself.

On-Line Simultaneous Sorption Preconcentration and Determination of Chromium(III) and Chromium(VI) with AAS Detection

1998 ◽  
Vol 63 (12) ◽  
pp. 2015-2026 ◽  
Author(s):  
Petr Rychlovský ◽  
Milan Krenželok ◽  
Radka Volhejnová
Keyword(s):  
Surface Waters ◽  
Acidic Solution ◽  
Soil Extracts ◽  
Sorption Preconcentration ◽  
Chromium Vi ◽  
Chromazurol S ◽  
On Line ◽  
Weakly Acidic Solution ◽  
Simultaneous Sorption

Speciation and simultaneous preconcentration of Cr(III) and Cr(VI) is based on the sorption of the reaction product of Cr(III) with Chromazurol S in weakly acidic solution and the sorption of the reaction product of Cr(VI) with sodium diethylcarbamate in strongly acidic solution. Reversed C18 phase was used for sorption of both the products. Both the complexes were eluted from columns directly into an AAS nebulizer using methanol. All the processes were automated. This method can be used for initial concentrations of Cr(III) and Cr(VI) below 1 ppm. The detection limits were 0.2 μg l-1 for Cr(III) and 2.4 μg l-1 for Cr(VI). This method was tested for analysis of practical samples (drinking and surface waters and soil extracts).

scholarly journals Propolis as a green corrosion inhibitor for bronze in weakly acidic solution

2017 ◽  
Vol 426 ◽  
pp. 1100-1112 ◽  
Author(s):  
Simona Varvara ◽  
Roxana Bostan ◽  
Otilia Bobis ◽  
Luiza Găină ◽  
Florin Popa ◽  
...  
Keyword(s):  
Corrosion Inhibitor ◽  
Acidic Solution ◽  
Green Corrosion Inhibitor ◽  
Weakly Acidic Solution

1121 Long-Lasting Impaired Mucosal Integrity After Esophageal Perfusion With Acidic & Weakly Acidic Solution Containing Deoxycholic Acid

2012 ◽  
Vol 142 (5) ◽  
pp. S-203
Author(s):  
Nicolas A. Pardon ◽  
Maria Vicario ◽  
Hanne Vanheel ◽  
Tim Vanuytsel ◽  
Kathleen Blondeau ◽  
...  
Keyword(s):  
Deoxycholic Acid ◽  
Acidic Solution ◽  
Mucosal Integrity ◽  
Weakly Acidic Solution
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