SULPHINIC ACIDS AS ANALYTICAL REAGENTS

1958 ◽  
Vol 36 (12) ◽  
pp. 1674-1679 ◽  
Author(s):  
T. P. Forrest ◽  
D. E. Ryan
Keyword(s):  
Acid Solution ◽  
Metal Ions ◽  
Aromatic Ring ◽  
Metal Atom ◽  
Ferric Iron ◽  
Aromatic Group ◽  
Orange Yellow ◽  
Yellow Precipitate ◽  
Analytical Reagents ◽  
Direct Attachment

The "specific" action of sulphinic acids with metal ions is not limited to compounds in which there is direct attachment of the —SO2H group to an aromatic ring. Since both aliphatic and aromatic sulphinic acids react similarly the assumption that an aromatic group is necessarily co-ordinated to the metal atom through its π system is not valid; the precipitated products are simple salts of the acids. Ferric iron yields at least two products with sulphinic acids. Ceric cerium is reduced in acid solution but an orange-yellow precipitate containing cerium is obtained from acetate-buffered solutions. Naphthalenesulphinic acid may be used to quantitatively precipitate [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text].[Formula: see text] [Formula: see text]

Thermodynamic Simulation of Sulphide Mineral Leaching

2009 ◽  
Vol 71-73 ◽  
pp. 437-440
Author(s):  
Lasse Ahonen ◽  
Pauliina Nurmi ◽  
Olli H. Tuovinen
Keyword(s):  
Acid Solution ◽  
Ferric Iron ◽  
Geochemical Modeling ◽  
Thermodynamic Simulation ◽  
Sulphide Mineral ◽  
Solution Ph ◽  
Dissolved Iron ◽  
Iron Precipitation ◽  
Oxidative Leaching ◽  
Mineral Leaching

Geochemical modeling program PHREEQC was used to simulate generic bioleaching processes. Carbonate minerals (e.g., calcite) dissolve in acid solution, increasing the solution pH and Ca concentration while the concentration of CO2 may be controlled by the equilibrium with the atmospheric CO2. Non-oxidative dissolution of Fe-monosulphides was demonstrated to release H2S and increase the pH. In the absence of ferric iron precipitation (goethite), the oxidation of pyrite decreased the solution pH from 2 to ~1.4, while the oxidation of Fe-monosulphide and chalcopyrite increased the solution pH to ~3.2-3.4. Assuming equilibrium precipitation of goethite, oxidative leaching decreased the solution pH for all three minerals from pH ~2 to ~0.9-1.2. Adjustment of the solution pH to 1.8 or 2.0 with KOH with concurrent equilibrium precipitation of K-jarosite resulted in low dissolved iron concentrations.

Hydrophobic–hydrophilic ionic liquids for the extraction and determination of metal ions with water-soluble reagents

2015 ◽  
Vol 7 (22) ◽  
pp. 9629-9635 ◽  
Author(s):  
S. V. Smirnova ◽  
T. O. Samarina ◽  
I. V. Pletnev
Keyword(s):  
Ionic Liquids ◽  
Metal Ions ◽  
Water Soluble ◽  
Analytical Reagents

Water-immiscible water-rich ionic liquids + water-soluble analytical reagents = a novel extraction-based platform for the determination of metal ions.

scholarly journals Study on The Third-Order NLO Properties of Trace Metal Ions in Nitric Acid Solution by Closed-Aperture Z-scan Technique

2020 ◽  
Vol 1484 ◽  
pp. 012005
Author(s):  
Muhammad Izz Rosli ◽  
Afiq Awalludin ◽  
Maisarah Duralim ◽  
Mundzir Abdullah ◽  
Muhammad Safwan Abd Aziz
Keyword(s):  
Nitric Acid ◽  
Acid Solution ◽  
Trace Metal ◽  
Metal Ions ◽  
Nitric Acid Solution ◽  
Closed Aperture ◽  
Third Order ◽  
Nlo Properties ◽  
Trace Metal Ions ◽  
The Third

ANTIBACTERIAL ACTION OF A REACTION PRODUCT OF CYSTEINE AND IRON: I. DEVELOPMENT OF THE SUBSTANCE IN MEDIA FOR MYCOBACTERIUM TUBERCULOSIS

1954 ◽  
Vol 1 (3) ◽  
pp. 175-181 ◽  
Author(s):  
Jack Konowalchuk ◽  
N. A. Hinton ◽  
G. B. Reed
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Acid Solution ◽  
Inhibitory Action ◽  
Ferric Iron ◽  
Antibacterial Action ◽  
Ferric Salt ◽  
Low Concentrations ◽  
Acid Reaction

It is shown that the growth of Mycobacterium tuberculosis or a rapidly growing strain of Mycobacterium in Dubos' medium is not influenced by the addition of low concentrations of cysteine or ferric salts, when added separately. But when cysteine and a ferric salt, both in low concentrations, are autoclaved together in the medium, the medium will not support growth of Mycobacterium. This inhibitory action only occurs when the cysteine–iron containing medium is at pH 6.8 or a more acid reaction. It is concluded that cysteine and ferric iron react in acid solution to produce a toxic end product.

scholarly journals Spirulina platensis Growth in Open Raceway Ponds Using Fresh Water Supplemented with Carbon, Nitrogen and Metal Ions

2003 ◽  
Vol 58 (1-2) ◽  
pp. 76-80 ◽  
Author(s):  
Jorge Alberto Vieira Costa ◽  
Luciane Maria Colla ◽  
Paulo Duarte Filho
Keyword(s):  
Sodium Bicarbonate ◽  
Metal Ions ◽  
Fresh Water ◽  
Spirulina Platensis ◽  
Ferric Iron ◽  
Dry Weight ◽  
Water Production ◽  
Rio Grande Do Sul ◽  
Urea Phosphate ◽  
Raceway Ponds

To investigate the feasibility of using fresh water from Mangueira Lagoon (Rio Grande do Sul, Brazil) for biomass production in open raceway ponds (0.7 m long, 0.18 m wide, 0.075 m deep) we studied the influence of nutrient addition (carbon as sodium bicarbonate, nitrogen as urea, phosphate, sulfate, ferric iron, magnesium and potassium) on the growth rate of the cyanobacteria Spirulina platensis using a 22 factorial design. In unsupplemented lagoon water production of S. platensis was 0.78 ± 0.01 g/l (dry weight basis) while the addition of 2.88 g/l of sodium bicarbonate (without added urea, phosphate, sulfate or metal ions) resulted in 0.82 ± 0.01 g/l after 400 hours of culture. The further addition of phosphate and metal ions resulted in growth for up to 750 h and a final S. platensis biomass of 1.23 ± 0.04 to 1.34 ± 0.03 g/l

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