Topic
Buffer solution
About: Buffer solution is a research topic. Over the lifetime, 6948 publications have been published within this topic receiving 112440 citations. The topic is also known as: pH buffer & buffer.
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TL;DR: In this paper, a fast and convenient analytical technique was adopted to detect dinitrophenol isomers directly and simultaneously in 0.1-mol L −1 HAc-NaAc buffer solution (pH 5.8).
33 citations
TL;DR: In this article, the SO2-removal efficiency of air-lift-tube (ALT) absorbers in laboratory and pilot scale was investigated. And the effect of SO2 removal in one and two stages of tube absorbers was measured.
Abstract: Absorption of SO2 from SO2/air mixture into sodium citrate buffer solution was performed using air-lift-tube (ALT) absorbers in laboratory and pilot scale. The aim of the study was to improve the efficiency of this regenerative process, to find the proper operation conditions in the air-lift-tube absorbers, and to contribute to the application of this process in the industry. The SO2-removal efficiency was measured while the gas velocity, the inlet SO2 concentration, the liquid hold-up, the sodium citrate buffer concentration and the liquid temperature were changed according to experimental design. Furthermore, the influence of oxidation on the SO2-removal efficiency was measured using SO2/N2 mixture instead of SO2/air mixture; the effect of stoichiometric ratio was investigated and the SO2 removal in one and two stages of tube absorbers was measured. The performance of the laboratory and pilot scale ALT absorbers was compared with that of other laboratory and pilot size absorption columns and of some non-regenerative methods.
33 citations
TL;DR: In this article, it was shown that poly- l -lysine (PLL) can be added to the electrolyte solution to increase the capacity of the β-lactam ring of ceftazidime.
33 citations
TL;DR: In this paper, the rate constants of the heterogeneous electron transfer and the transfer coefficients were estimated from cyclic voltammetry measurements, performed in aqueous buffer solutions at different potential scan rates and pH values, corroborated with the slope of the formal standard potential versus pH linear regression.
33 citations
TL;DR: An amperometric biosensor based on horseradish peroxidase (HRP) and γ-Al2O3/chitosan composite film at a glassy carbon electrode has been developed.
Abstract: An amperometric biosensor based on horseradish peroxidase (HRP) and γ-Al2O3/chitosan composite film at a glassy carbon electrode has been developed. Hydrogen peroxide (H2O2) was detected with the aid of ferrocene monocarboxylic acid mediator to transfer electrons between the electrode and HRP. The morphology and composition of the modified electrode were characterized by scanning electron microscopy and electrochemical impedance spectroscopy. The electrochemical characteristics of the biosensor were studied by cyclic voltammetry and amperometry. The effects of HRP concentration, the applied potential, and the pH values of the buffer solution on the response of the sensor were investigated for optimum analytical performance. The proposed biosensor showed high sensitivity (0.249 A M−1 cm−2) and a fast response (<5 s) to H2O2 with the detection limit of 0.07 μM. The linear response range of the enzyme electrode to H2O2 concentration was from 0.5 to 700 μM with a correlation coefficient of 0.9998. The apparent Michaelis-Menten constant of the biosensor was calculated to be 0.818 mM, exhibiting a high enzymatic activity and affinity for H2O2.
33 citations