scholarly journals Flotation of copper-bearing shale in solutions of inorganic salts and organic reagents

2017 ◽  
Vol 18 ◽  
pp. 01028
Author(s):  
Tomasz Ratajczak
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Aqueous Solutions ◽  
Inorganic Compounds ◽  
Foam Height ◽  
The Other ◽  
Short Chain ◽  
Inorganic Salts ◽  
Reverse Effect ◽  
Organic Reagents

Flotation data on copper-bearing shale in aqueous solutions of inorganic electrolytes (NaCl, Na2SO4, KPF6, NH4Cl) and organic reagents (ethylamine, propylamine) as frothers were presented and discussed. The relationships between shale flotation, surface tension of aqueous solution and foam height during bubbling with air in the flotation system were presented. It has been found that flotation of shale in the presence of inorganic salts the yield was directly proportional to the surface tension of the aqueous solution of salt and inversely proportional to the height of the foam. On the other hand, for organic reagents solutions (short chain amines), a reverse effect has been observed in relation to the inorganic compounds studied, that is the yield of copper-bearing shale flotation and the foam height were inversely proportional to the surface tension of the amine solution.

scholarly journals Prediction of Aqueous Solution Surface Tension of Some Surfactant Mixtures and Composition of Their Monolayers at the Solution–Air Interface

2021 ◽  
Vol 5 (4) ◽  
pp. 53
Author(s):  
Bronisław Jańczuk ◽  
Anna Zdziennicka ◽  
Katarzyna Szymczyk ◽  
Maria Luisa González-Martín
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Aqueous Solutions ◽  
Ternary Mixtures ◽  
Mixture Component ◽  
Surfactant Mixtures ◽  
Surface Tension Reduction ◽  
Air Interface ◽  
Binary And Ternary Mixtures ◽  
Solution Surface

Measurements of the surface tension of the aqueous solution of SDDS mixture with fluorocarbon surfactants (FC) were carried out and considered in light of the surface tension of aqueous solutions of individual surfactants. Similar analyses were made for many other aqueous solutions of binary and ternary mixtures, taking into account the literature data of the surface tension of aqueous solutions of TX100, TX114, TX165, SDDS, SDS, CTAB, CPyB and FC. The possibility of predicting the surface tension of the aqueous solution of many surfactant mixtures from that of the mixture components using both the Szyszkowski, Fainerman and Miller and Joos concepts was analyzed. The surface tension of the aqueous solutions of surfactant mixtures was also considered based on the particular mixture component contribution to the water surface tension reduction. As a result, the composition of the mixed surface layer at the solution–air interface was discussed and compared to that which was determined using the Hua and Rosen concept. As follows from considerations, the surface tension of the aqueous solution of binary and ternary surfactant mixtures can be described and/or predicted.

Inactivation of biologically active N-methyl-N-nitroso compounds in aqueous solution: effect of various conditions of pH and illumination

1968 ◽  
Vol 46 (8) ◽  
pp. 807-811 ◽  
Author(s):  
D. R. McCalla ◽  
Antoon Reuvers ◽  
Ruth Kitai
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Low Ph ◽  
Biologically Active ◽  
The Other ◽  
Nitroso Compounds ◽  
Breakdown Rates ◽  
Dilute Aqueous Solutions

The rates of decomposition of N-methyl-N′-nitro-N-nitrosoguanidine (NG), N-methyl-N-nitroso-p-toluenesulfonamide (MNTS), N-methyl-N-nitrosourea, and N-methyl-N-nitrosourethane in dilute aqueous solutions at pH levels ranging from 2 to 9 are tabulated. There are considerable differences in the breakdown rates of these compounds. At low pH, MNTS is destroyed several times faster than any of the other compounds, while at pH 7, MNTS is about 100 times as stable as methylnitrosourea. Rates of photochemical destruction of NG and MNTS are also given. Some of the breakdown products have been identified. These data are used to provide tentative explanations for some apparently anomalous biological results.

Azobenzene based inorganic salts for light modulated ionic conductivity in aqueous solution

Soft Matter ◽  
2019 ◽  
Vol 15 (40) ◽  
pp. 7992-7995 ◽  
Author(s):  
Ning Kang ◽  
Peiqi Li ◽  
Shuai Tan ◽  
Caihong Wang
Keyword(s):  
Aqueous Solution ◽  
Ionic Conductivity ◽  
Aqueous Solutions ◽  
Inorganic Salts

Azobenzene based inorganic salts demonstrated light modulated ionic conductivity behaviors in aqueous solutions.

scholarly journals Adsorption of lauryl sulphonic acid in the surface of its aqueous solution, and the Gibbs theorem

1940 ◽  
Vol 174 (958) ◽  
pp. 286-298 ◽  
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Sulphonic Acid ◽  
The Other ◽  
Absolute Amount ◽  
Dilute Solution ◽  
Exposed Surface ◽  
No Adsorption ◽  
Interferometer Method ◽  
Negative Adsorption

The absolute amount of adsorption per square centimetre of exposed surface of a solution may be measured with certainty and with moderate accuracy. In the microtome method (McBain and Humphreys 1932; McBain and Swain 1936; McBain, Ford and Mills 1940) the quiescent surface is cut from a solution in complete equilibrium with its vapour, collected, and analysed. In the interferometer method (Ford and McBain 1936; McBain, Mills and Ford 1940) a similar surface in equilibrium is compressed into the bulk of the liquid in the path of an interferometer beam which measures excess coming from the known surface destroyed. Both methods applied to solutions of lauryl sulphonic acid, C 12 H 25 SO 3 H, agree in showing strong positive adsorption over the whole range of concentrations. On the other hand, the curve of surface tension with concentration is of Type III, showing very great lowering in extreme dilution, leading immediately to a minimum, followed by a definite rise to a shallow maximum, with a slight decrease of this already low value with further concentration. The Gibbs theorem demands an initial positive adsorption of the acid, followed by no adsorption at all where the surface tension is most lowered, followed by strong negative adsorption, then zero adsorption, still in dilute solution with very low surface tension, followed by slight positive adsorption.

VIII.—The Absorption of Light by Inorganic Salts. No. VI.: The Cobalt Chloride Colour Change

1913 ◽  
Vol 32 ◽  
pp. 50-61
Author(s):  
Alex R. Brown
Keyword(s):  
Aqueous Solution ◽  
Cobalt Chloride ◽  
Colour Change ◽  
The Other ◽  
Inorganic Salts ◽  
Rectangular Hole ◽  
Absorption Of Light ◽  
Striking Change ◽  
Made In ◽  
Vertical Cell

In No. II. of this series of papers, measurements were given of the striking change shown by cobalt chloride when an aqueous solution was heated or was altered in concentration, and it was announced that a more accurate investigation was being made in the hope of finally determining its cause. Chemists suppose the cause to be the dehydration of the hexahydrate, but the matter is not beyond doubt.First of all, aqueous solutions were used. Except in regard to the heating arrangements the methods and apparatus were those used in the previous research. The heater in this case was a rectangular copper casting 8 cm. long, 2·5 cm. broad, 4·5 cm. high, which at one end was attached to a tin in which water was boiled. At a distance 1·2 cm. from the other end a rectangular hole was cut down through the casting, of dimensions such that it was just filled by the cell containing the solution to be heated. At each side of the hole from the base upwards a part of the casting 1·6 cm. high and 1·1 cm. broad was cut away. This permitted the transmission of light horizontally through the lower part of the vertical cell, which was of the ordinary rectangular type, and obviated the use of mirrors. As in the previous research glasses were inserted in the cell to reduce the thickness of the layer of solution examined, and the temperature of the solution was read by a thermometer.

Concentration-dependent aggregation of water-soluble phosphorus porphyrin in an aqueous solution

2012 ◽  
Vol 16 (02) ◽  
pp. 210-217 ◽  
Author(s):  
Jin Matsumoto ◽  
Shin-ichio Tanimura ◽  
Tsutomu Shiragami ◽  
Masahide Yasuda
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Aqueous Solution ◽  
Surface Tension ◽  
Cell Wall ◽  
Water Soluble ◽  
The Other ◽  
Measuring Surface ◽  
Soluble Phosphorus ◽  
Pass Through ◽  
Low Passage

Water-soluble phosphorus tetraphenylporphyrins (1) were prepared by the introduction of axial polyoxaalkyloxo ligands (–O–(CH2CH2O)m–(CH2)n–H) . Bioaffinity of 1 for Saccharomyces cerevisiae was evaluated on the basis of the concentration (B A ) of 1 absorbed into the cells after they were immersed into an aqueous solution of 1 (10 μM). The behavior of 1 in the concentration range from 1 μM to 0.1 mM were estimated by measuring surface tension and absorption spectra and the behavior at a concentration of 1 mM were estimated by NMR spectroscopy. The 1 (m = 2, n = 4; m = 1, 2 and 3, n = 6) with a high B A of 123–171 mM were solved as monomers at 10 μM and could pass through the cell wall to accumulate inside the cell. Once inside the cell, where they reached a concentration of more than 10 μM, they formed aggregates that were unable to escape to the outside of the cell. On the other hand, it was found that 1 (m = 2 and 3, n = 1; m = 2, n = 2), whose B A values were <24 mM, did not form aggregates in the range from 1 μM to 1 mM; this indicated that they easily passed through the cell wall in both directions. In the case of 1 (m = 2 and 3, n = 12), whose B A values were low, passage through the cell wall was not possible because aggregates formed even at <1 μM.

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