Highly Acidic Extractant, 4-Benzoyl-3-phenyl-5-isoxazolone: The Synergistic Extraction of Alkaline Earth and Alkali Metals Combined with Trioctylphosphine Oxide or Bis(diphenylphosphinyl)methane

1995 ◽  
Vol 68 (10) ◽  
pp. 2867-2873 ◽  
Author(s):  
Quyen T. H. Le ◽  
Shigeo Umetani ◽  
Takayuki Sasaki ◽  
Takeshi Tomita ◽  
Masakazu Matsui
Keyword(s):  
Alkali Metals ◽  
Alkaline Earth ◽  
Synergistic Extraction ◽  
Trioctylphosphine Oxide

scholarly journals HYDROCHEMISTRY OF THE PYANJ TRANSBOUNDARY RIVER UPSTREAM, MIDDLE AND DOWNSTREAM AND THE CRITERION ITS USE FOR IRRIGATION

2021 ◽  
Vol 445 (1) ◽  
pp. 114-120
Author(s):  
I. Sh. Normatov ◽  
V.V. Goncharuk ◽  
N.A. Amirgaliev ◽  
A.S. Madibekov ◽  
A.I. Normatov
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Water Samples ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Maximum Permissible Concentration ◽  
Agricultural Land ◽  
Transboundary River ◽  
Formation Zone

The water quality of the transboundary Pyanj River in the formation zone and along the riverbed before merging with another tributary of the transboundary Amu Darya River-the Vakhsh River was studied. The water quality on the upstream river corresponds to the very soft class (> 1.5 mmol/dm3) and in the middle and the downstream to the soft class (1.5-3.0 mmol/dm3). At the upper, middle and lower reaches of the Pyanj river the concentration of alkaline earth exceeds alkali metals (Ca2+ + Mg2+> Na+ + K+) at HCO3- > SO42- + Cl- and according to the Handa classification they are characterized by temporary rigidity. To assess the criterion of applicability of the Pyanj river water for irrigation the coefficient of sodium adsorption (SAC) was calculated for water samples from the upstream (Khorog), middle (Darvaz) and the downstream (Lower Pyanj) of the Pyanj river that were equal to 0.88; 1.07; 1.71, respectively. The SAC values for all water samples (from the upper, middle and lower reaches) of the Pyanj river indicate their good qualities for irrigation of agricultural land. The concentration of heavy metals in the Pyanj river is significantly lower than the maximum permissible concentration (MPC).

scholarly journals Interactions Between Zinc Oxide and Alkali Metals, Alkaline Earth Metals and Halogens: A Theoretical Study

2017 ◽  
Vol 29 (3) ◽  
pp. 585-588
Author(s):  
Aned de Leon ◽  
Grace Jouanne-Jeraissati ◽  
Agustín Martínez-Contreras
Keyword(s):  
Zinc Oxide ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Theoretical Study ◽  
Alkaline Earth Metals

scholarly journals The alkaline earth halide spectra and their origin

1928 ◽  
Vol 118 (779) ◽  
pp. 120-137 ◽  
Keyword(s):  
Calcium Chloride ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Careful Study ◽  
Background Spectrum ◽  
Continuous Background ◽  
Alkaline Earths ◽  
The Subject ◽  
Band Spectra ◽  
Halogen Salts

It has been known since the early days of spectroscopy that there is a group of band spectra associated with the halogen salts of the alkaline earths. Probably the first distinction between the oxide and chloride bands of these elements was made by Lecoq de Boisbaudran when he observed relative intensity fluctuations between two band systems on introducing hydrochloric acid vapour into a flame charged with calcium chloride. The system intensified by the acid vapour he attributed to the chloride. The other halides were also found to yield characteristic spectra. Since their discovery they have been the subject of only one publication of any real note. Olmsted made a careful study of these spectra as they are found under flame excitation, and his catalogue of bands contains the only reliable data concerning these spectra which is available. An exception must be made of the fluoride spectra, which have been closely studied by Dufour, Datta, and others. The origin of the present investigation of these bands was the discovery that it is possible to observe them, very conveniently, in absorption against a continuous background spectrum. In the course of attempts to find band spectra of the alkaline earth metals (corresponding to those of the alkali metals) a pair of bands at about λ 6200 was observed in the absorption spectrum of a column of calcium vapour at temperatures of 900°C. and upwards. On measurement, these bands, which are reproduced in Plate 2, figs. 1, 2 and 5, were found to coincide with two prominent calcium chloride bands. Ordinary commercial calcium had been used for the experiments, and on analysis approximately 0·05 per cent, of chloride was found in it. It seemed evident that the development of the bands was due to this impurity in the metal, and the matter was clinched by adding a trace of bromide to the metal before heating, when the calcium bromide bands in the red also appeared prominently in absorption.

scholarly journals The band spectra associated with zinc, cadmium, and mercury

1929 ◽  
Vol 122 (789) ◽  
pp. 201-210 ◽  
Keyword(s):  
Absorption Spectra ◽  
Small Proportion ◽  
Periodic Table ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Diatomic Molecules ◽  
Alkaline Earth Elements ◽  
Zinc Cadmium ◽  
Band Spectra ◽  
Methods Of Measurement

Tbe band spectra of the alkali metals are now well known, and it has been established that they are due to a small proportion of diatomic molecules, which are normally present in the vapours of these metals. It is as yet uncertain how many other metals, with vapours which, according to the ordinary methods of measurement, appear to be monatomic, give similar spectroscopic proof of association. Throughout a large number of experiments with the saturated vapours of the alkaline earth elements, up to 1200° C., we have found no evidence of band spectra which can be attributed to diatomic molecules of these metals. The elements of Group II b of the Periodic Table are much more interesting in this respect, and it is with experiments on the absorption spectra of these that this communication is concerned.

Sign in / Sign up

Export Citation Format

Share Document