Telluric Acid Research Articles

The raman spectra of some inorganic compounds

The Raman spectra of telluric acid, and the chromate, molybdate, tungstate, periodate, bisulphate, chlorate, bromate, and azide ions are obtained. From these spectra, Te (OH)6 is shown to be octahedral, CrO4″, MoO4″, WO4″ and IO4′ ions as tetrahedral, ClO3′ and BrO3′ ions as pyramidal and N 3 − as linear and unsymmetrical, in structure. The splitting of the frequencies due to the removal of degeneracy by distortion of ions in the crystals, are observed in a few cases.

The hydroxyl frequency in the Raman spectra of acids and acid salts

The Raman spectra of sulphuric, iodic, selenious and telluric acids and sodium dihydrogen phosphate and potassium bisulphate have been obtained under long exposure and using complementary filters. In every case, a band characteristic of the O−H group has been recorded. The band is weak and diffuse and is shifted to a frequency considerably lower than that due to free hydroxyl group. The results are discussed in relation to electrolytic dissociation and molecular structure of these compounds. From the nature of the spectra, the characteristic features of the Raman band due to the so-called hydrogen bond are deduced. Some new Raman frequencies in selenious and telluric acids are indicated in the paper.

Hexaco-ordination of Tellurium, Molybdenum and Tungsten

THE Raman spectra of telluric acid and several molybdates and tungstates have been examined in the crystalline state and in aqueous solutions, particular care being taken to record their complete Raman spectra. Some of the results are given below:

The O-H Raman Frequency in Inorganic Acids

The band characteristic of the OH group has been recorded in the Raman spectra of many hydroxides and alcohols. It has not so far been observed, however, in the case of the stronger acids. Using the improved technique of complementary filters recently developed by Ananthakrishnan1, and giving long exposures varying from six to twelve days, I have succeeded in obtaining spectra with sulphuric acid and crystals of iodic, selenious and telluric acids, in which the band is clearly seen in the 4046 A. excitation. Table 1 gives the frequency shifts. The value for boric acid is taken from Ananthakrishnan's paper2.

Societies and Academies

Societies and Academies

The Failure of Brilliant Green and Telluric Acid as Selective Agents for the Isolation ofBacillus typhosusfrom Faeces

1. The causes of failure of the brilliant green enrichment method for isolation ofB. typhosusare discussed.2. It has been shown that the negative results obtained depend partly on the number of resistantB. colistrains normally present in faeces, and partly on the use of McConkey's as a plating out medium.3. The alleged selective action of telluric acid could not be confirmed.4. The so-called antagonism betweenB. coliandB. typhosushas been investigated, and by the use of a selective bismuth medium it is shown that this is more apparent than real in most cases.5. However, the existence of certain strains ofB. colior similar bacteria with a specific inhibitory effect onB. typhosushas been confirmed.6. The value of Wilson's bismuth medium for the isolation ofB. typhosushas been demonstrated.

A Method for the Preparation of Telluric Acid

A Method for the Preparation of Telluric Acid

Differential Antiseptic Action of Organic Dyes

AN important property of certain organic dyes is their differential antiseptic action. Thus, varieties of B. coli commonly met with in the intestine are more susceptible to the inhibitory action of the tetraethyl-diamidotriphenylmethane derivative, “brilliant green,” than are typhoid or paratyphoid bacilli. The use of a fluid culture medium containing this dye (along with telluric acid) facilitates greatly the isolation of scanty typhoid and paratyphoid bacilli from faae, since the growth of the various members of the coli group can be restrained, while the organisms in question proliferate actively. The detection of cases of typhoid infection, e.g. in “carriers,” which is frequently a difficult bacteriological problem, can be materially simplified by this procedure. But our supplies of brilliant green have hitherto been derived from Germany, and I shall be indebted to your readers for information as to whether this dye is prepared in a fairly pure state by anyone in this country.

Estimation of iodine and bromine in haloid salts by means of telluric acid

Estimation of iodine and bromine in haloid salts by means of telluric acid

The use of telluric acid in the determination of bromine associated with chlorine in haloid salts

The use of telluric acid in the determination of bromine associated with chlorine in haloid salts

On the preparation of tellurous acid and copper ammonium tellurite

On the preparation of tellurous acid and copper ammonium tellurite

A note on the preparation of telluric acid and a test for associated tellurous acid

A note on the preparation of telluric acid and a test for associated tellurous acid

The Determination of Tellurous Acid in Presence of Haloid Salts

The Determination of Tellurous Acid in Presence of Haloid Salts

The determination of tellurous acid in presence of haloid salts

The determination of tellurous acid in presence of haloid salts

LVIII.—Action of hydrogen sulphide on solutions of antimonic, arsenic, and telluric acids

The first page of this article is displayed as the abstract.

An iodometric method for the estimation of telluric acid

An iodometric method for the estimation of telluric acid

Societies and Academies

PARIS Academy of Sciences, August 18.—M. Rolland, President, in the chair.—Obituary discourses pronounced at the obsequies of M. Paul Thenard, by MM. Bouley and Fremy.—Observations of the small planets made with the great meridian instrument of the Paris Observatory during the second quarter of the present year, by M. Moucliez.—Essays in stellar photography, with a view to the construction of maps of the heavenly bodies, by MM. Paul and Prosper Henry, by M. Mouchez. The results so far obtained have been secured by means of an objective with a diameter of 0.l6 m. and 2.10 m. focal distance. They represent on a surface of rather less than a square decimetre a section of the Milky Way of 3° of right ascension, and 2° declination, showing 1500 stars from the sixth to the twelfth magnitude. The images of these stars have a diameter nearly proportioned to their brilliancy, except the yellow stars, which appear somewhat fainter. These encouraging results have induced MM. Henry, who are skilful opticians as well as experienced observers, to undertake the construction of a much larger objective with a diameter of 0.34 m., specially adapted for photographing the celestial orbs.—Note on a new method of representing graphically the speed of railway trains, by M. Léon Lalanne.—Report on various communications relating to the cholera, by the Commissioners, MM. Vulpian, Marey, Richet, Bert, Pasteur, Bouley, and Gosselin. Thirty fresh communications received by the Academy during the month of August have been examined with practically no results. Even Dr. Peyrusson's views regarding the efficacy of borax and boric acid are purely theoretic, unsupported by any practical tests.—Account of a new balloon capable of being guided in any direction and kept under control, by MM. Ch. Renard and A. Krebs. The authors claim to have solved the problem of aerial navigation by means of a new balloon of elongated form, and provided with a screw and helm, which was successfully tried at Chalais on August 9. After a trip of nearly five miles, it returned to the starting point, obeying the helm, and executing a series of manoeuvres with a precision comparable to that of a screw steamship in the water. Chief dimensions: length 50.42 m., diameter 8.40 m., volume 1864 m., total weight 2000 kilos.—Observations of the Barnard comet made at the Observatory of Nice, by M. Perrotin.—Observations on the solar spots and volcanic eruptions during the year 1883, by M. P. Tacchini.—Note on a fixed astronomical telescope, by M. G. Hermite.—Note on the freezing-point of saline solutions, by M. F. M. Raoult.—On the combinations of telluric acid with the salts of the bioxide of tellurium, by M. D. Klein.—Researches on the modifications produced in the nutrition of the nervous system by mania, lypemania, and epilepsy, by M. A. Mairet.—Researches on the microbe of typhoid fever in man; its cultivation, and inoculation of the virus in rabbits, guinea-pigs, poultry, pigeons, pigs, and other animals, by M. Tayon.—Note on the slow period of latent excitation in the muscles of invertebrate animals, by M. H. de Varigny.—Account of a new variety of Rhizopod found on the Arcachon coast, south of Bordeaux, by M. J. Künstler.—Note on a relation between the temperatures effusion of simple bodies and their atomic weights, by M. Chapel. The same author presented a paper on the coincidence of seismic and meteorological phenomena with the return of the August meteoric showers.