Zirconium arsenates

Zirconium Arsenates.—Zirconium Orthoarsenate, Zr3(As04)4. 5H20, has been obtained 5 as a voluminous white precipitate by adding sodium monohydrogen orthoarsenate to a solution of zireonyl fluoride in hydrochloric acid. Zirconium monohydrogen orthoarsenate, Zr(HAs04)2, appears to be formed slowly by adsorption of arsenic acid by zirconium dioxide.6... 

After vashlng the ppt. with 2 acid washing soln., the ppt. Is dissolved In 1 ml of aqua regia and diluted to 10 ml. Scavenging pptns. of zirconium arsenate and silver chloride are carried out hy adding 10 mg each of Zr and Ag carriers and then nn/nng ) mi of phenylarsonlc acid In a little 6 B HC1. The zirconium arsonate scavenging la repeated. Then K Rh(B0 )e Is ppted. ana counted. 

No thermodynamic data relevant to the formation of aqueous zirconium arsenate species was found. 

Karyakin et al. [98KAR/CHE] studied the enthalpy of formation of unhydrated two forms of zirconium arsenate, a-Zr(HAs04)2 and p-Zr(HAs04)2 as well as hydrated zirconium arsenate, Zr(HAs04)2 H20(cr), using adiabatic calorimetry. The enthalpy data obtained by these workers are ... 

There are no other reported thermochemical data for zirconium arsenate compounds. 

T. Chang, S. Ho, and K. Chao, Polyaniline intercalated into zeolites, zirconium phosphate and zirconium arsenate, J. Phys. Org. Chem., 7, 371-376 (1994). 

Dark violet Zirconium, arsenic, boron, and phosphorus... 

Some elements found in body tissues have no apparent physiological role, but have not been shown to be toxic. Examples are mbidium, strontium, titanium, niobium, germanium, and lanthanum. Other elements are toxic when found in greater than trace amounts, and sometimes in trace amounts. These latter elements include arsenic, mercury, lead, cadmium, silver, zirconium, beryUium, and thallium. Numerous other elements are used in medicine in nonnutrient roles. These include lithium, bismuth, antimony, bromine, platinum, and gold (Eig. 1). The interactions of mineral nutrients with... 

Copper. The physical properties of pure copper are given in Table 11. The mechanical properties of pure copper are essentially the same as those for ClOl and CllO. The coppers represent a series of alloys ranging from the commercially pure copper, ClOl, to the dispersion hardened alloy C157. The difference within this series is the specification of small additions of phosphoms, arsenic, cadmium, tellurium, sulfur, zirconium, as well as oxygen. To be classified as one of the coppers, the alloy must contain at least 99.3% copper. 

Determination of phosphate as ammonium molybdophosphate. This may be readily effected by precipitation with excess of ammonium molybdate in warm nitric acid solution arsenic, vanadium, titanium, zirconium, silica and excessive amounts of ammonium salts interfere. The yellow precipitate obtained may be weighed as either ammonium molybdophosphate, (NH4)3[PMo12O40], after drying at 200-400 °C, or as P205,24Mo03, after heating at 800-825 °C for about 30 minutes. 

After adjusting to 2 mol 1 1 in hydrochloric acid, 500 ml of the sample is adsorbed on a column of Dowex 1-XS resin (Cl form) and elution is then effected with 2 M nitric acid. The solution is evaporated to dryness after adding 1M hydrochloric acid, and the tin is again adsorbed on the same column. Tin is eluted with 2 M nitric acid, and determined in the eluate by the spectrophotometric catechol violet method. There is no interference from 0.1 mg of aluminium, manganese, nickel, copper, zinc, arsenic, cadmium, bismuth, or uranium any titanium, zirconium, or antimony are removed by ion exchange. Filtration of the sample through a Millipore filter does not affect the results, which are in agreement with those obtained by neutron activation analysis. 

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

PerSniemi S., Hannonen S., Mustalathi H., Ahlgren M., Zirconium-loaded activated charcoal as an adsorbent for arsenic, selenium and mercury, Fresenius J. Anal. Chem. 349, 1994,510-515. 

Yoshida, I., Konami, T., Shimonishi, Y., Morise, A., Ueno, K., Adsorption of arsenic (III) ion on various ion exchange resins loaded with iron (111) and zirconium (IV). Nippon Kagaku Kaishi, 1981,379-384. 

Kobayashi, E., Sugai, M., Imajyo, S., Adsorption of arsenate ion by the zirconium(iv) oxide hydrate active carbon complex. Nihon Kagaku Kaishi 1984, 656-660. 

Suzuki, T. M., Bomani, J. O., Matsunaga, H., Yokoyama T., Preparation of porous resin loaded with crystalline hydrous zirconium oxide and its application to the removal of arsenic. React. Fund. Polym. 2000, 43,165-172. 

Suzuki, T. M., Tanaka, D. A. P., Tanco, M. A. L., Kanesato, M., H., Yokoyama, T., Adsorption and removal of oxo-anions of arsenic and selenium on zirconium(IV) loaded polymer resin functionalized with diethylenetriamine-N, N,N ,N -polyacetic acid, J. Environ. Monit., 2, 2000, 550-555. 

Major constituents (greater than 5 mg/L) Minor constituents (O.Ol-lO.Omg/L) Selected trace constituents (less than 0.1 mg/L) Bicarbonate, calcium, carbonic acid, chloride, magnesium, silicon, sodium, sulfate Boron, carbonate, fluoride, iron, nitrate, potassium, strontium Aluminum, arsenic, barium, bromide, cadmium, chromium, cobalt, copper, gold, iodide, lead, Uthium, manganese, molybdenum, nickel, phosphate, radium, selenium, silver, tin, titanium, uranium, vanadium, zinc, zirconium... 

Toxicity Variable. The hydrides of phosphorus, arsenic, sulfur, selenium, tellurium and boron which are highly toxic, produce local irritation and destroy red blood cells. They are particularly dangerous because of their volatility and ease of entry into the body. The hydrides of the alkali metals, alkaline earths, aluminum, zirconium and titanium react with moisture to evolve hydrogen and leave behind the hydroxide of the metallic element. This hydroxide is usually caustic. See also sodium hydroxide... 

Disodium Arsenate Heptahydrate Disodium Ethylenebis (Dithiocarbamate) Disodium Methanearsonate Disodium Methyl Arsonate Disodium Nitrilotriacetate Distillate Flashed Feed Stocks Distillate Straight Run Disulfatozirconic Acid Dithane Sodium Arsenate Nabarn Methanearsonic Acid, Sodium Salts Medianearsonic Acid, Sodium Salts Nitrilotriacetic Acid and Salts Distillate Flashed Feed Stocks Distillate Straight Run Zirconium Sulfate Nabam... 

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