3 edition of Calcium arsenate industry. found in the catalog.
Calcium arsenate industry.
United States. Federal Trade Commission.
Referred to the Committee on Agriculture and Forestry and ordered printed March 3, 1923.
|Series||67th Cong., 4th sess. Senate. Doc -- 345.|
|The Physical Object|
|Pagination||21 p. incl. tables.|
|Number of Pages||21|
|LC Control Number||23026181|
extensive studies on the use of calcium arsenate for cotton insects. The experi- mental work continued many years, and much of the development and use of calcium arsenate may be attributed to their efforts. TYPICAL OF THE DEVELOPMENT of other products by industry is the re- search in the early 's that led to the commercial sale of summer spray. Establishments primarily engaged in the formulation and preparation of ready-to-use agricultural and household pest control chemicals, including insecticides, fungicides, and herbicides, from technical chemicals or concentrates; and the production of concentrates which require further processing before use as agricultural pesticides.
Calcium acetate is used to treat hyperphosphatemia (too much phosphate in the blood) in patients with end stage kidney disease who are on dialysis. Calcium acetate works by binding with the phosphate in the food you eat, so that it is eliminated from the body without being absorbed. Pollution prevention in the semiconductor industry through recovery and recycling of gallium and arsenic from GaAs polishing wastes and suspended polish as a mixed precipitate of calcium.
AAFCO AAFCO has adopted Agent Allied Chem ammonia ammonium ammonium nitrate Armour Fertilizer Ashcraft-Wilkinson Asst Atlanta Bldg brand calcium calcium arsenate Capacity carbonate cent Chem Chemical Corp Chemical Div Chicago Chipman Chem Company Main office Cont'd containing Control Officials Cyanamid Dept Dusts Dye Corp Emulsions Equipt. Adverse health effects have been reported in industrial situations where these materials were formulated, and packaged, and occasionally used. Reduction of arsenate has been demonstrated to occur when mixtures of lime, lime sulfur, sulfur, and casein were added to lead or calcium arsenate.
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Calcium arsenate is the inorganic compound with the formula Ca 3 (AsO 4) 2.A colourless solid, it was originally used as a pesticide and as a is highly soluble in water, as compared with lead arsenate, which makes it more minerals Rauenthalite Ca 3 (AsO 4) 2 10H 2 O and Phaunouxite Ca 3 (AsO 4) 2 11H 2 O are hydrates of calcium al formula: Ca₃(AsO₄)₂.
Hamsters were given weekly intratracheal instillations of calcium arsenate dust suspensions. Animals were killed at weekly intervals and the concn of arsenic was determined in lung, liver, and hair by atomic absorption spectrophotometry following wet digestion and arsine generation.
Animals treated with calcium arsenate had concn of As in the lung about times higher than that of. Precipitation with lime to form calcium arsenate and/or arsenite (and similar phases) has been used in the gold industry since at least the s (Laguitton, ; Riveros et al., ).
It is now widely acknowledged that calcium arsenate is unstable as a long-term disposal solution except under special circumstances where local environmental. When heated to decomposition, calcium arsenate produces toxic fumes of arsenic.
Avoid heat. Hazardous polymerization may not occur. (EPA, ) Health Hazard. This material is extremely toxic; the probable oral lethal dose for humans is mg/kg, or between 7 drops and 1 teaspoonful for a lb.
person. It is an irritant to eyes, respiratory. Though thermodynamically unstable, calcium–arsenic precipitates are thought to be kinetically stable due to the presence of lime, which maintains a high pH value as long as it is not dissolved through the action of water and/or carbonation.
Figure demonstrates that calcium arsenate [Ca 3 (AsO 4) 2] is liable to dissolve at pH values below 7. Iron arsenate (FeAsO4) is much better than calcium arsenate because of its stability and acid resistance.
In this study, calcium [email protected] arsenate coating materials were synthesized. Lime additions to arsenic-containing wastes have been proven to be beneficial in reducing the mobility of dissolved arsenic, presumably through the formation of low-solubility calcium arsenates.
However, the role of calcium arsenate formation in reducing the concentrations of dissolved arsenic has not been well established. Therefore, slurries with varying Ca/As ratios were equilibrated, and.
Arsenic is a chemical element with the symbol As and atomic number Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental c is a has various allotropes, but only the gray form, which has a metallic appearance, is important to industry. The primary use of arsenic is in alloys of lead (for example, in car.
The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. Ca3(AsO4)2⋅ 3H2O(c), Ca3(AsO4)2⋅ 21/4H2O(c), Ca5(AsO4)3(OH)(c) and Ca4(OH)2(AsO4)2⋅ 4H2O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between and The solids precipitated at pH = 3 ∼ 7 and Ca/As = were.
ide, Gu(OH)2, and calcium sulfate, CaS04, is formed. This suspension has a blue color and leaves a bluish-white deposit on sprayed surfaces. Bordeaux mixture is primarily a fungicide but is often used in connec- tion with insecticides such as nicotine, lead arsenate, and calcium arsenate.
It is sometimes used to control the. Tricalcium o-arsenate. See Calcium arsenate. Trilead arsenate. Pb 3 (AsO 4) 2. Trimethylarsine (CH 3) 3 As; synonyms, Gosio gas, TMA.
Trimethylarsine oxide (CH 3) 3 AsO. Triorganyl arsenate. general term for neutral esters of arsenic acid of the type (RO) 3 AsO. Triorganyl arsenite. general term for neutral esters of arsenous acid of the type.
However, relatively low levels of calcium could reduce silica interference to arsenic sorption onto activated alumina. While future confirmation research is needed, severe silica interference can occur in practice due to exclusion of arsenate from interstitial granular media pores.
Lime precipitation which was widely used in the past is being abandoned as a result of strong evidence showing that calcium arsenate compounds decompose slowly in contact with atmospheric CO 2 to form calcium carbonate and soluble arsenic acid.
In all cases, the long term stability of the disposed arsenic compounds depends on a number of. Iron arsenate (FeAsO 4) is much better than calcium arsenate because of its stability and acid resistance. In this study, calcium [email protected] arsenate coating materials were synthesized. From the results of the XRD and SEM analyses, it was shown that calcium arsenate was coated by an iron arsenate shell which consisted of nanoparticles.
Effect of Calcium and Magnesium Addition on Arsenic Leaching from Paddy Field Soil of Bangladesh. Journal of Water and Environment Technology8, DOI: /jwet Young Jae Lee.
Spectroscopic investigation of arsenate and selenate incorporation into hydroxylapatite. Current Applied Physics10, DOI: Get this from a library. Report of the Federal Trade Commission on the calcium arsenate industry: March 3, [United States.
Federal Trade Commission.]. significant instability of calcium arsenates for pH > , and calcium carbonate will be the stable solid phase above this pH value. The change of calcium arsenate to calcium carbonate will release arsenic in the environment.
For pH ranging from andthe total arsenate concentrations in aque. Calcium arsenate. Regulatory process names 2 CAS names 1 IUPAC names 1 Other identifiers 4 ↓Groups: 1A, or 1B and/or an entry in the Candidate list.
Broad agreement: comes from industry data where a majority of data submitters agree the substance is a respiratory sensitiser.
Minority position: comes from industry data where a minority of. Calcium arsenate is cheaper than lead arsenate, but its lack of adherence properties renders it less effective.
Its use has been greatly reduced by the availability of organic insecticides. The commercial calcium arsenate product is usually a mixture of tricalcium arsenate (Ca_(AsO,)~) and lime, called basic calcium arsenate. Correction for ‘The synthesis of calcium [email protected] arsenate coating materials and their application for arsenic-containing wastewater treatment’ by Yang Wang et al., RSC Adv.,10, –.
‘Volume 4 of the Handbook of Mineralogy is, like its predecessors, an invaluable reference work, this time on essentially all the arsenates, phosphates, vanadates, and uranates known through ’.Calcium arsenate.
These corrosion data are mainly based on results of general corrosion laboratory tests, carried out with pure chemicals and water solutions nearly saturated with air (the corrosion rate can be quite different if the solution is free from oxygen).e.g. lead arsenate and calcium arsenate. Common organic arsenic compounds are arsanilic acid, methylarsonic acid, dimethylarsinic acid (cacodylic acid) and arsenobetaine.
Arsenic trioxide is only slightly soluble in water; in sodium hydroxide it forms arsenite and with concentrated hydrochloric acid it forms arsenic trichloride.