Semimicromethod for Determination of Cyanate Ion in Presence of Interfering Substances

Shaw, William H.; Bordeaux, John J.

doi:10.1021/ac60097a044

Cited by 22 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pathways for hydrolysis, in which the urea experiences electrophilic attack to form carbamate or carbamic acid, are generally found to be far slower in the absence of a catalyst but are acid/base-catalyzed. − In water, the product ammonia may evolve or be protonated to ammonium, and the OCNH may deprotonate to cyanate, depending upon pH. In acid, cyanate is rapidly converted to ammonium and carbonic acid by eq . , …”

Section: Results and Discussionmentioning

confidence: 99%

Complexity of Intercalation in MXenes: Destabilization of Urea by Two-Dimensional Titanium Carbide

et al. 2018

View full text Add to dashboard Cite

MXenes are a new class of two-dimensional materials with properties that make them important for applications that include batteries, capacitive energy storage, and electrocatalysis. These materials can be exfoliated and delaminated to create high surface areas with interlayers accessibility. Intercalation is known to be possible, and it is critical for many applications including electrochemical energy storage, water purification, and sensing. However, little is known about the nature of the intercalant and bonding interactions between the intercalant within the MXene. We have investigated urea interaction within a titanium carbide based MXene using inelastic neutron scattering (INS) to probe the state of intercalated species. By comparison with reference materials, we find that under intercalation conditions urea decomposes readily, leading to intercalation of ammonium cations observable by INS and evolving carbon dioxide detected by infrared spectroscopy. Reactive molecular dynamics calculations were conducted to provide atomistic insights about reaction pathways and their energetics. These results have implications for understanding intercalation in active layered materials.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Complexity of Intercalation in MXenes: Destabilization of Urea by Two-Dimensional Titanium Carbide

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The concentrations of ammonia and carbon dioxide in the reaction products increased over a period of several hours, indicating that they arose from the breakdown of some intermediate oxidation product. This intermediate could be adsorbed to anionic but not cationic exchange resins, was hydrolysed by 2 N-sulphuric acid and could be measured as cyanate by the method of Shaw & Bordeaux (1955).…”

Section: Resultsmentioning

confidence: 99%

“…This was measured by the indirect method of Dixon (Umbreit, Burris & Stauffer, 1959). Cyanate. This was measured as ammonia after the removal of interfering cations by ion-exchange chromatography (Shaw & Bordeaux, 1955).…”

Section: Methodsmentioning

confidence: 99%

The inhibition of streptococci by lactoperoxidase, thiocyanate and hydrogen peroxide. The oxidation of thiocyanate and the nature of the inhibitory compound

Oram¹,

Reiter²

1966

Biochemical Journal

110

View full text Add to dashboard Cite

1. The products of the lactoperoxidase-catalysed oxidation of thiocyanate by hydrogen peroxide were sulphate, carbon dioxide and ammonia. Cyanate, sulphite and a compound showing increased extinction at 235mmu (the ;235 compound') were intermediate oxidation products. 2. Two of the intermediates acted as electron acceptors in the oxidation of NADH(2). Thus NADH(2) was oxidized by sulphite in the presence of lactoperoxidase (EC 1.11.1.7) and Mn(2+) and by the ;235 compound' in the presence of an enzyme, the NADH(2)-oxidizing enzyme, present in extracts of lactoperoxidase-resistant streptococci. Sulphur dicyanide also acted as an electron acceptor in the latter reaction. The ;235 compound' was also reduced non-enzymically by sulphite. 3. The glycolysis of lactoperoxidasesensitive streptococci suspended in glucose solution was not inhibited by sulphite, cyanate, cyanide or the ;235 compound' but was inhibited by sulphur dicyanide. The inhibition by 0.1mm-sulphur dicyanide could be reversed, as could that caused by lactoperoxidase, thiocyanate and hydrogen peroxide, by washing the cells or by the addition of a cell-free extract of a lactoperoxidase-resistant streptococcus. 4. The effects of 0.1mm-sulphur dicyanide on catabolic enzymes of resting streptococci were very similar to those of the lactoperoxidase-thiocyanate-hydrogen peroxide system. Thus hexokinase was completedly inhibited, glucose 6-phosphate dehydrogenase and aldolase were partially inhibited and phosphohexokinase was little affected in both cases.

show abstract

“…16 1.2782 31.900 0.3570 35.539 0.0000 (37.9) The first equation 5 defines a quantity A', which is linear in concentration for negligible or slight association and readily extrapolates to A0; the second is the modified form of the Ostwald dilution law which neglects the higher terms in mobility involving E and J. From our earlier work4 on BU4NBPI14 in PhNOo-CCh, we obtained the result R+ = 3.55 + 15/0 (7) for the apparent hydrodynamic radius of the Bu4N + ion in this solvent system; hence we could calculate Xo+t? from the Walden-Stokes relation ,+ = Pe/1800 tn»JFt+ (8) for each of the solvent mixtures of Table I.…”

Section: Discussionmentioning

confidence: 94%

Electrolyte-Solvent Interaction. VIII. Tetrabutylammonium Salts in Nitrobenzene-Carbon Tetrachloride Mixtures at 25°^1,2

Hirsch¹,

Fuoss²

1960

J. Am. Chem. Soc.

View full text Add to dashboard Cite

Semimicromethod for Determination of Cyanate Ion in Presence of Interfering Substances

Cited by 22 publications

References 12 publications

Complexity of Intercalation in MXenes: Destabilization of Urea by Two-Dimensional Titanium Carbide

Complexity of Intercalation in MXenes: Destabilization of Urea by Two-Dimensional Titanium Carbide

The inhibition of streptococci by lactoperoxidase, thiocyanate and hydrogen peroxide. The oxidation of thiocyanate and the nature of the inhibitory compound

Electrolyte-Solvent Interaction. VIII. Tetrabutylammonium Salts in Nitrobenzene-Carbon Tetrachloride Mixtures at 25°^1,2

Contact Info

Product

Resources

About

Semimicromethod for Determination of Cyanate Ion in Presence of Interfering Substances

Cited by 22 publications

References 12 publications

Complexity of Intercalation in MXenes: Destabilization of Urea by Two-Dimensional Titanium Carbide

Complexity of Intercalation in MXenes: Destabilization of Urea by Two-Dimensional Titanium Carbide

The inhibition of streptococci by lactoperoxidase, thiocyanate and hydrogen peroxide. The oxidation of thiocyanate and the nature of the inhibitory compound

Electrolyte-Solvent Interaction. VIII. Tetrabutylammonium Salts in Nitrobenzene-Carbon Tetrachloride Mixtures at 25°1,2

Contact Info

Product

Resources

About

Electrolyte-Solvent Interaction. VIII. Tetrabutylammonium Salts in Nitrobenzene-Carbon Tetrachloride Mixtures at 25°^1,2