Rubidium arsenate

Rubidium Arsenates.8—Rubidium Orthoarsenate, Rb3As04, is prepared by adding a solution of rubidium hydroxide to aqueous arsenic acid until the former is in excess. Very hygroscopic white lamellae of the dihydrate, Rb3As04.2H20, are deposited on evaporation. The salt absorbs carbon dioxide from the air and its solution is alkaline in reaction. When heated, the water of crystallisation is lost at 100° C. 

The same rules are current for the ultratrace elements lithium, rubidium, arsenic, vanadium, aluminum, and uranium (Table 6.10), which are determined later in different species. 

Heavy Metals, Vanadium, Molybdenum, Mercury, Uranium, Potassium, Calcium, Titanium, Gallium, Arsenic, Selenium, Rubidium, Strontium, Yttrium, Zirconium, Silver, Antimony, and Barium... 

Nixon277 compared atomic absorption spectroscopy, flame photometry, mass spectroscopy, and neutron activation analysis as methods for the determination of some 21 trace elements (<100 ppm) in hard dental tissue and dental plaque silver, aluminum, arsenic, gold, barium, chromium, copper, fluoride, iron, lithium, manganese, molybdenum, nickel, lead, rubidium, antimony, selenium, tin, strontium, vanadium, and zinc. Brunelle 278) also described procedures for the determination of about 20 elements in soil using a combination of atomic absorption spectroscopy and neutron activation analysis. 

Antimony, arsenic, bismuth, cadmium, calcium, cesium, chromium, cobalt, copper, gold, indium, iridium, iron, lead, lithium, magnesium, manganese, mercury, nickel, palladium, platinum, potassium, rhodium, rubidium, ruthenium, selenium, silver, sodium, tellurium, thallium, zinc... 

The electrical conductivities of soln. of a great many compounds in liquid hydrogen halides have been measured by E. H. Archibald and D. McIntosh. The conductivity is raised considerably by phosphoryl chloride. Sodium sodium sulphide, borate, phosphate, nitrate, thiosulphate, and arsenate chromic anhydride potassium nitrate, hydroxide, chromate, sulphide, bisulphate, and ferro- and ferri- cyanide ammonium fluoride and carbonate j rubidium and caesium chloride magnesium sulphate calcium fluoride ... 

The addition of chlorine monofluoridc across the C = 0 bonds in difluorophosgene, per-fluoroacyl fluorides, and perfluoroketones with the formation of hypochlorites occurs only in the presence of the catalysts potassium fluoride, rubidium fluoride, cesium fluoride80,81 or the strong Lewis acids hydrogen fluoride, boron trifluoride, or arsenic(V) fluoride.82 The cesium fluoride catalyzed reactions are carried out in an autoclave for 2-3 hours at — 20"C or left overnight.80... 

Arsenic triiodide also dissolves, the saturated solution at 15° C. having density 3-661. Other soluble halides are potassium bromide, anhydrous ferric and aluminium chlorides 6 and tetramethyl ammonium iodide but the iodides of rubidium, cadmium, manganese and cobalt, also mercuric and stannic iodides, and cobalt and stannic bromides, are insoluble or only very slightly soluble in arsenic tribromide. The liquid also dissolves phosphoryl bromide and, very slightly, ammonium thiocyanate. In the mixed solutions of halides, the components may react chemically (cf. p. 106), but such is not always the case for example, with antimony tribromide a continuous series of solid solutions is formed.7... 

Rubidium Metarsenite, RbAs02, has been prepared8 by the action of arsenious oxide on rubidium carbonate in aqueous solution. It is a white amorphous powder which is converted to arsenate in aqueous solution and by the action of heat. The solution is alkaline in reaction. 

Rubidium Dihydrogen Orthoarsenate, RbH2As04, is obtained in the anhydrous form by fusing together equal parts of arsenious oxide and rubidium nitrate, or by neutralising rubidium carbonate solution with arsenic acid using methyl orange as indicator in the former method it yields tabular crystals and in the latter silky needles. At a dull red heat it forms the metarsenate. 

Some elements found in hody tissues have no apparent physiological role, hut have not been shown in he toxic. Examples arc rubidium, strontium, titanium, niobium, germanium, and lanthanum. Other elements are toxic when found in greater than trace amounts, and sometimes in trace amounts. These taller elements include arsenic, mercury, lead, cadmium, silver, zirconium, beryllium, and thallium. Numerous irlhcr elements are used in medicine in non-nulrieni roles. These include lithium, bismuth, antimony, bromine, platinum, and gold. The interactions of mineral nutrients with carbohydrates, fats, and proteins, minerals with vitamins (qv). and mineral nutrients with toxic elements are areas of active investigation. 

H. Stamm also measured the solubilities of the salts of the alkalies in liquid ammonia —potassium hydroxide, nitrate, sulphate, chromate, oxalate, perchlorate, persulphate, chloride, bromide, iodide, carbonate, and chlorate rubidium chloride, bromide, and sulphate esesium chloride, iodide, carbonate, and sulphate lithium chloride and sulphate sodium phosphate, phosphite, hypophosphite, fluoride, chloride, iodide, bromate, perchlorate, periodate, hyponitrire, nitrite, nitrate, azide, dithionate, chromate, carbonate, oxalate, benzoate, phtnalate, isophthalate ammonium, chloride, chlorate, bromide, iodide, perchlorate, sulphate, sulphite, chromate, molybdate, nitrate, dithionate, thiosulphate, persulphate, thiocyanate, phosphate, phosphite, hypophosphite, arsenate, arsenite, amidosulphonate, ferrocyanide, carbonate, benzoate, methionate, phenylacetate, picrate, salicylate, phenylpropionate, benzoldisulphonate, benzolsulphonate, phthalate, trimesmate, mellitate, aliphatic dicarboxylates, tartrate, fumarate, and maleinate and phenol. 

Phosphorus-nitrogen arsenic-chlorine type Alkali metal salt thermionic type Potassium chloride source for phosphorus compounds, rubidium source for nitrogen compounds [397]... 

Most metal salts are readily soluble in water. However, the potassium salt of the 9-molybdophosphoric acid is only slightly soluble in cold water. Rubidium and cesium salts have some solubility. In the arsenic series the lead, mercurous, silver, cesium, and thallous salts are insoluble. 

An opportunity also existed with these materials to provide techniques for determining small amounts of certain elements that appear within the spectral envelopes of other elements present in high concentrations. For example, lead has been found to be present in such high concentrations in currency that it introduces uncertainties as to the presence of observed elements such as arsenic, mercury, bismuth, and rubidium, which appear at or near the ubiquitous lead peaks. There are also extremely strong iron peaks appearing at or near important trace elements such as manganese, nickel, cobalt, and copper, which require further study to avoid serious error. 

Rubidium arsenite and arsenate.—Several derivatives of arsenious acid and arsenic acid have been prepared.1 Their properties are analogous to those of the corresponding potassium salts. 

River Station Date Discharge Cond. pH SPM Vanadium Chromium Manganese Cobalt Nickel CoQper Zinc Arsenic Rubidium Strontium Cesium Barium Lead Uranium... 

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