The molar solubility of sodium acetate
was measured in binary mixtures
of methanol, 1-propanol, acetonitrile, and water along with the density
of their saturated solutions at 298.2 K. The molar solubilities span
a range of nearly 4 orders of magnitude from 5.53 mol·L–1 in water to 0.0014 mol·L–1 in acetonitrile,
the according values for the mole fraction solubilities are 0.119
and 0.00007. For the calculation of the solubility and the density
at any composition of the binary solvent mixture, a computational
method is provided, based on the Jouyban–Acree model. The method
uses the solubility data in the monosolvents and their density and
model constants; the latter are derived by fitting the experimental
data to the Jouyban–Acree model. Solubilities and densities
were back-calculated, and the overall mean percentage deviations between
experimental and calculated values were 9.8 % for the solubilities
and 0.4 % for the densities of the saturated solutions.
In this study, polytaurine film was formed on a gold surface using repetitive cyclic voltammetry (CV) from taurine and phosphate buffer solution (PBS) and used as an electrochemical nanobiosensor for determination of malondialdehyde (MDA). The electrochemical behaviour of polytaurine modified gold (PT/Au) electrode was studied using CV technique. The Electroanalytical behaviour of MDA was investigated at the PT/Au electrode in (PBS), using differential pulse voltammetry. Finally, the applicability of the method to direct assays of human serum and exhaled breath condensate (EBC) is described, and the results showed that this polymeric sensor is suitable for detecting total serum MDA levels of healthy people because the normal level of total MDA in serum is in the range of 0?78-3?10 mM. The results show that by using the proposed sensor, MDA can be determined with detection limits of 34 and 0?995 nM in human serum and EBC samples, respectively.
In this study, silica-coated magnetite nanoparticles modified with triethoxysilylpropylpyridinium hexafluorophosphate ionic liquid were synthesized and used as a sorbent for the solid-phase extraction and preconcentration of zinc ions from aqueous solutions. The structure and morphology of the synthesized nanosorbent were characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. After desorption with acidic ethanol, zinc was quantified by flame atomic absorption spectrometry. The experimental factors affecting the extraction/ preconcentration of the analyte were investigated and optimized. Under the optimized experimental conditions, the calibration graph was linear in the concentration range of 0.5-15 ng mL À1 (with an R 2 value of 0.998). The limit of detection and the preconcentration factor were 0.17 ng mL À1 and 100, respectively. The relative standard deviation for six replicate determinations of 10 ng mL À1 Zn was 2.3%.The method was validated by the successful analysis of a standard reference material (NIST SRM 1549;non-fat milk powder) and employed for the determination of zinc in several samples of water and milk, with recoveries in the range of 97.0-102.5% for the spiked samples.
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