Liquid–solid phase equilibria and the frozen ratio of ternary aqueous solution of acetic acid and sodium chloride

Background: Herbicides are very beneficial in the crop yield with the aid of controlling weeds within the agriculture, but several herbicides are chronic in soil. Objective: In this study, nanoparticles and the packages of synthesized novel silica nanoparticles were studied for the preconcentration of herbicides. Methods: These nanoparticles prepared by the Stöber mechanism were purified and functionalized. Nanoparticles thus prepared successfully were used as supporting material for the preconcentration of residues of herbicides in the water. Results: Preconcentration was achieved by preparing the silica-based solid-phase-extraction cartridges. Nanoparticles used for this purpose were within the range of 50-250 nm. An SPE cartridge was prepared by packing 200 mg of silica nanoparticle in the empty cartridge of diameter 5.5 cm and length 0.6 cm in between PTFE frits. Aqueous solutions of 0.1 μg/ml of herbicides were prepared separately, and 10 ml of the solution was passed through the cartridge at the rate of 0.2 ml/min. After passing 10 ml volume of the aqueous solution, residues adsorbed on the cartridge were eluted using 2 ml of acetonitrile. The eluate was injected to determine the herbicide residue adsorbed on the SPE cartridge. Conclusion: In the study, it was found that greater than 90% of the herbicide residues were trapped on silica nanoparticle-based SPE cartridge. An analytical method was developed for the simultaneous determination of these herbicides. The residues were quantified by LC-MS/MS with ESI mode.

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MSA ROEBLING MEDAL LECTURE: THE EFFECTS OF SOLID-SOLID PHASE EQUILIBRIA AND PARTIAL MELTING ON THE OXYGEN FUGACITY OF THE UPPER MANTLE

10.1130/abs/2017am-304520 ◽

2017 ◽

Author(s):

E.M. Stolper ◽

◽

O. Shorttle

Keyword(s):

Phase Equilibria ◽

Partial Melting ◽

Oxygen Fugacity ◽

Upper Mantle ◽

Solid Phase

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Quantitative and Qualitative Analysis of Some Inorganic Compounds by Raman Spectroscopy

Applied Spectroscopy ◽

10.1366/0003702944029802 ◽

1994 ◽

Vol 48 (7) ◽

pp. 875-883 ◽

Cited By ~ 33

Author(s):

Daniel R. Lombardi ◽

Chao Wang ◽

Bin Sun ◽

Augustus W. Fountain ◽

Thomas J. Vickers ◽

...

Keyword(s):

Aqueous Solution ◽

Raman Spectroscopy ◽

Qualitative Analysis ◽

Raman Spectra ◽

Solid Phase ◽

Inorganic Compounds ◽

Core Material ◽

Storage Tanks ◽

Hanford Site ◽

Sampling Probe

Raman spectra have been measured for a number of nitrates, nitrites, sulfates, ferrocyanides, and ferricyanides, both in the solid phase and in aqueous solution. Accurate locations of peak maxima are given. Limits of detection for some of the compounds are given for solutions and for solid mixtures in NaNO3. Preliminary measurements have been made on core material recovered from the storage tanks on the Hanford site in Richland, Washington. Representative spectra are presented, showing that it is possible to observe responses of individual components from measurements made directly on untreated cores, with the use of a fiberoptic sampling probe.

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Self-supported 3D reduced graphene oxide for solid-phase extraction: An efficient and low-cost sorbent for environmental contaminants in aqueous solution

Talanta ◽

10.1016/j.talanta.2021.122750 ◽

2021 ◽

pp. 122750

Author(s):

Raimara de Souza Gomes ◽

Anderson Thesing ◽

Jacqueline Ferreira Leite Santos ◽

Andreia Neves Fernandes

Keyword(s):

Aqueous Solution ◽

Graphene Oxide ◽

Solid Phase Extraction ◽

Reduced Graphene Oxide ◽

Solid Phase ◽

Low Cost ◽

Environmental Contaminants ◽

Phase Extraction ◽

Reduced Graphene

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PhFl acetic acid: A new linker for solid phase organic synthesis

Tetrahedron Letters ◽

10.1016/s0040-4039(98)00846-6 ◽

1998 ◽

Vol 39 (26) ◽

pp. 4591-4594 ◽

Cited By ~ 12

Author(s):

Konrad H. Bleicher ◽

James R. Wareing

Keyword(s):

Acetic Acid ◽

Organic Synthesis ◽

Solid Phase ◽

Solid Phase Organic Synthesis

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DETERMINATION OF TRACE AMOUNTS OF SILVER IN GALENA ORES

Canadian Journal of Chemistry ◽

10.1139/v60-208 ◽

1960 ◽

Vol 38 (9) ◽

pp. 1488-1494 ◽

Cited By ~ 6

Author(s):

E. J. Bounsall ◽

W. A. E. McBryde

Keyword(s):

Aqueous Solution ◽

Nitric Acid ◽

Sodium Chloride ◽

Hydrochloric Acid ◽

Chloride Solution ◽

Sodium Chloride Solution ◽

Silver Content ◽

Aqueous Sodium Chloride Solution ◽

Aqueous Sodium

An analytical method is described for the determination of microgram amounts of silver in galena ores, based on the "reversion" of silver dithizonate. Silver is separated from relatively large amounts of lead by extraction as dithizonate into chloroform from an aqueous 1:99 nitric acid solution. Separation from mercury, which is also extracted under these conditions and would, if present, interfere in the analysis, is achieved by reverting the dithizonate solution with a 5% aqueous sodium chloride solution which is also 0.015 molar in hydrochloric acid. Following dilution of this aqueous solution and adjustment of pH, silver is again extracted into chloroform as the dithizonate, and determined absorptiometrically. Analyses of a number of galena ore samples showed a precision of within 3% for a silver content ranging from 0.03 to 0.4%.Some other methods for isolating silver from these samples, which were tried but found unsatisfactory, are discussed.

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