Buffer Standards for pH Measurement of N-(2-Hydroxyethyl)piperazine-N′-2-ethanesulfonic Acid (HEPES) for I=0.16 mol⋅kg−1 from 5 to 55 °C

Roy, Rabindra N.; Roy, Lakshmi N.; Ashkenazi, Shahaf; Wollen, Joshua T.; Dunseth, Craig D.; Fuge, Michael S.; Durden, Jared L.; Roy, Chandra Nath; Hughes, Hannah M.; Morris, Brett T.; Cline, Kevin L.

doi:10.1007/s10953-009-9378-3

Cited by 14 publications

(20 citation statements)

References 17 publications

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“…Bates et al , 1973; Roy et al , 1998; Roy et al , 2009), we have used a series of log and polynomial terms to describe the dependence of p K a,c on absolute temperature ( T k , K) and solution ionic strength ( I s , M) as:…”

Section: Methodsmentioning

confidence: 99%

A compendium of temperature responses of Rubisco kinetic traits: variability among and within photosynthetic groups and impacts on photosynthesis modeling

Galmés

Hermida-Carrera

Laanisto

et al. 2016

EXBOTJ

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Section: Methodsmentioning

confidence: 99%

A compendium of temperature responses of Rubisco kinetic traits: variability among and within photosynthetic groups and impacts on photosynthesis modeling

Galmés

Hermida-Carrera

Laanisto

et al. 2016

EXBOTJ

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“…1 [22]. For a more detailed study, the reader may refer to the following references: [21] and [22]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Short note on the hydrolysis and complexation of neptunium(IV) in HEPES solution

Dahou¹,

Hennig²,

Moisy³

et al. 2013

Radiochimica Acta

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The speciation of actinides in environmental or biological media is often difficult to assess because it involves complex media. We would like to report here on the properties of Np(IV) cation in the well known biological HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) buffer medium. HEPES has been targeted because the possibility to use this biological buffer in actinide toxicological studies presents several advantages although the possible effects of concentrated HEPES medium on the hydrolysis of the actinides (in particular at oxidation state +IV) has not been studied yet. A combination of spectrophotometric and EXAFS measurements at the Np L III edge shows that stable hydrolyzed neptunium(IV) clusters are obtained between pH 2.5 and 4. In a second step, in order to better understand the reactivity of these hydrolysis species formed in HEPES, the effect of a strong chelating ligands such as the hydroxamic acid (HA) or desferrioxamine (DFO) siderophores has been also investigated using spectrophotometry and EXAFS. Upon addition of HA or DFO, the hydrolyzed clusters of Np(IV) are unstable and monomeric complexes are formed and yield Np environments that are very similar to that of crystallized Pu-DFOE complex [Al(H 2 O) 6 ][Pu(DFE)(H 2 O) 3 ] 2 (CF 3 SO 3 ) 5 ·10H 2 O reported in the literature.

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“…The method of Bates [5,10] has been used to evaluate the conventional standard pH values for buffer solutions (a) to (h) as was done previously [12,13,14] where the symbols "s," "l," and "g" imply the solid, liquid, and gaseous states.…”

Section: Methods and Resultsmentioning

confidence: 99%

Standards for pH Measurements of Bis-[(2-Hydroxyethyl)amino]acetic Acid (BICINE) from (278.15 to 328.15) K

Roy¹,

Roy²,

Bodendorfer³

et al. 2013

TOELECJ

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Abstract:The second dissociation constant, pK 2 , and related thermodynamic data for BICINE have been previously determined and reported from temperatures (278.15 to 328.15) K. For the present study, three buffer solutions without NaCl, and five with NaCl yielding an ionic strength (I = 0.16 mol·kg -1 ) similar to that of blood plasma were prepared. These buffer solutions have been evaluated in the temperature range of (278.15 to 328.15) K using the extended form of the Debye-Hückel equation. The Bates-Guggenheim convention is only valid when I< 0.1 mol·kg -1 . Values of the residual liquid junction potential (δE j ) between the BICINE solutions and the saturated KCl calomel electrode have been estimated at (298.15 and 310.15) K. Two BICINE buffer solutions are recommended as primary standard reference solutions for pH measurements of biological fluids.

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Buffer Standards for pH Measurement of N-(2-Hydroxyethyl)piperazine-N′-2-ethanesulfonic Acid (HEPES) for I=0.16 mol⋅kg−1 from 5 to 55 °C

Cited by 14 publications

References 17 publications

A compendium of temperature responses of Rubisco kinetic traits: variability among and within photosynthetic groups and impacts on photosynthesis modeling

A compendium of temperature responses of Rubisco kinetic traits: variability among and within photosynthetic groups and impacts on photosynthesis modeling

Short note on the hydrolysis and complexation of neptunium(IV) in HEPES solution

Standards for pH Measurements of Bis-[(2-Hydroxyethyl)amino]acetic Acid (BICINE) from (278.15 to 328.15) K

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