42 results about "Sodium arsenite" patented technology

The invention discloses a recycling treatment method of hazardous arsenic-containing waste. The recycling treatment method comprises the steps of carrying out alkaline leaching on a high-arsenic material to obtain a high-concentration sodium arsenite solution or a high-concentration sodium arsenate solution, and completely converting the high-concentration sodium arsenite solution or the high-concentration sodium arsenate solution into sodium arsenate through oxidation; adding a small amount of seed crystal-lepidocrocite (gamma-FeOOH) slurry into a reaction kettle; slowly adding an arsenic-containing solution; adding a slightly excessive high-concentration malysite solution; maintaining the reaction pH to be 3.5 to 5.5 through adding a neutralizer; and controlling the temperature in the reaction process to enable arsenic in the solution to completely react and totally deposit, wherein an obtained deposit is easy to filter, harmless and stable treatment of the arsenic-containing solution can be achieved, when the method is utilized to deposit arsenic, the concentration of arsenic in filtrate after reaction can directly reach the standard, and secondary arsenic deposition is avoided. The treatment method is simple in technological process, low in cost and applicable to industrial application.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for arsenic containing material comprehensive recovering and arsenic resource utilization. The method sequentially comprises the four steps including oxygen pressure water leaching, leaching liquid selective reduction purification, leaching slag washing and slag washing for valuable metal recovering. Through the processes that oxygen pressure water leaching, soluble arsenic in smoke is desorbed, leaching liquid is subject to selective reduction purification, purified liquid is a pure sodium arsenite solution, and the leaching slag is subject to washing, reduction smelting, oxidation blowing and the like, all valuable elements are recycled to the greatest extent. According to the method, the arsenic is desorbed from the smoke, the stable arsenic fixing ore is synthesized, stibium, lead, bismuth and the like are left in arsenic removal slag as many as possible, and separation and harmless treatment of the arsenic and the valuable metal are achieved. The method is high in resource comprehensive utilization rate and wide in raw material application scope, and the problem of pollution in the traditional handicraft extraction process is solved. The beneficial effects of the method are more obvious for the smoke generated in the lead and zinc smelting process particularly.

The invention relates to a method for analyzing arsenic in an ore sample, comprising the following steps of: adding nitric acid and potassium chlorate in a certain amount of sample; adding sulphuric acid heating, dissolving and evaporating until sulfur trioxide smother smokes for a few minutes, cooling and adding water and blowing and washing; heating and dissolving; adding copper sulfate and hydrochloric acid; then adding sodium hypophosphite until the yellow of Fe3<+> completely fades; excessively adding and boiling under the reducing acidity and keeping for a certain micro boiling time to enable the arsenic to settle and agglomerate; settling and filtering the arsenic; washing a beaker and the sedimentation by using a hydrochloric acid solution containing sodium hypophosphite; washing the beaker and the sedimentation by using an ammonium chloride solution until the pH value is 5; transferring a degreasing cotton wool to an original beaker; adding a buffer solution and a starch solution into the beaker; accurately adding an iodine standard liquid; and dropping a sodium thiosulfate standard liquid to blue until the blue color disappears, i.e. an end point is achieved. The method avoids the use of a rank poison of sodium arsenite, reduces the reducing acidity and improves the operation conditions. The invention can be directly used for titrating an excessive iodine solution with sodium thiosulfate without repeatedly titrating the standard liquid for multiple times, can obtain accurate and reliable result and is more applicable for analysis and measurement of a flow sample.

The present invention provides methods for preventing, treating, and/or managing cancer, the method comprising administering to a subject in need thereof therapeutically effective amount of sodium meta arsenite that reduces or eliminates drug resistant cancer stem cell populations as well as drug resistant mature cancer cells.

The invention provides a harmless treatment method for recycling valuable metal and arsenic resources from arsenic-containing smoke. All valuable elements are recycled and utilized through the procedures of carrying out oxygen pressure leaching via caustic alkali; carrying out selective reduction purification on leachate; during purification, carrying out hydrogen reduction and vacuum distillation on obtained crude tellurium so as to obtain high-purity tellurium; after purification, obtaining a pure sodium arsenite solution, and using the solution for the arsenic salt purification of a zinc sulfate solution so as to remove cobalt and nickel; carrying out fluidization washing on leaching residues; after washing, solidifying arsenic in the solution, and carrying out reduction smelting on the residues; and carrying out oxidization blowing and the like. The arsenic is removed from the smoke, stibium, lead, bismuth, stannum and the like are kept in the residues from which the arsenic is removed as much as possible, and the deep separation of the arsenic and the stibium is realized. The obtained pure sodium arsenite solution is used for the arsenic salt purification of the zinc sulfate solution used for wet-process zinc smelting so as to remove the cobalt and nickel raw materials, part of sodium arsenate with high impurity content is solidified, the arsenic is precipitated, the harmless recycling of the arsenic resource is realized, and the valuable elements, such as the tellurium, the stibium, the lead and the bismuth are recycled. The comprehensive utilizing rate of the resources is high, the application range of the raw materials is wide, and a pollution problem in the extracting process of a traditional technology is solved.

The invention belongs to the technical field of analytical chemistry, and particularly relates to a method for determining arsenic content in ore. Potassium dichromate is adopted to replace iodine inthe conventional hypophosphite titration method, and ammonium ferrous sulfate is adopted to replace poisonous sodium arsenite reagent in the conventional hypophosphite titration method. Compared withdetermination by conventional hypophosphite titration, the method avoids the usage of sodium arsenite medicine, achieving the a poison-less and environment-friendly effect, and also avoids the problemof poisonous chemical control and environmental pollution caused by the usage of arsenic trioxide. The method adopts potassium dichromate and ammonium ferrous sulfate for joint titration, avoiding the usage of poisonous and harmful reagents, so the method is not only safe but also environmentally friendly; moreover, the method is easy to operate, the range of determination is wide, determinationresults are accurate, and the method is suitable for the testing and analysis of samples in large batch, and can be widely applied in the field of testing and analysis of arsenic content in ore. The method is suitable for the analysis of ore with arsenic content of 0.15 to 10 percent.

The invention relates to alkaline leaching liquid containing arsenic, tellurium, lead and tin, in particular to a method for obtaining high-purity tellurium from arsenic-containing alkaline leaching liquid. The alkaline leaching liquid is leaching liquid obtained after oxygen pressure alkaline leaching treatment of high arsenic and antimony smoke. The alkaline leaching liquid is neutralized through sulfuric acid, neutralization solution selective reducing is conducted, and the liquid obtained after reducing is a pure sodium arsenite solution and is used as a raw material for purification and removal of cobalt and nickel through zinc sulfate solution arsenic salt; and reducing slag and neutralizing slag are subjected to hydrogen reducing and vacuum distillation, and high-purity tellurium with the purity being 99.999% or above is obtained. According to the method, the tellurium is recycled from the high-tellurium solution, and the pure sodium arsenite solution is obtained and used as the raw material for purification and removal of cobalt and nickel through the zinc hydrometallurgy zinc sulfate solution arsenic salt. According to the method, the technology process is short, the recycling rate is high, and the problem of pollution in the extraction process in the traditional technology is solved.

The invention provides a serum-free stem cell culture medium which comprises a basal culture medium and supplement factors. The recruitment factors include sodium arsenite, transferrin, bovine serum albumin, insulin, fibronectin and hydrocortisone. Compared with serum culture mediums of the prior art, the serum-free stem cell culture medium has the advantages that quality difference among serum batches can be avoided, and repeatability of cell culture and experiment results is improved; exogenous pollution caused by serum and cytotoxic effect of serum components are avoided. The serum-free stem cell culture medium has relatively clear own ingredients, uniform quality, low protein content and is conducive to improving stability of cell product production and easy to purify. In addition, after stem cell proliferation and property degrees are maintained through several specific matching modes, high-density cell culture can be maintained for a long time by prolonging GI period of cells or forcing the cells to be in G0 period, and stem cell characteristics can be retained better.

The invention provides a method for recycling high-purity tellurium from arsenium-containing and tellurium-containing smoke and preparing high-purity tellurium, and relates to production for comprehensively recycling valuable elements, such as arsenium, tellurium and lead, from the arsenium-containing and tellurium-containing smoke and harmless recycling processing of the arsenium. Oxygen pressure leaching is conducted on caustic alkali, leaching residues are rough sodium pyroantimonate, leachate is neutralized through sulfuric acid, the neutralized liquid is selectively reduced, the reduced liquid is a pure sodium arsenite solution and is used as a raw material of zinc sulfate solution arsenic salt purification and cobalt and nickel removal, reduction residues and neutralization residues are subjected to hydrogen reduction and vacuum distillation, and the high-purity tellurium with the purity being 99.999% or above is obtained. The arsenium and the tellurium are leached out from the smoke, while stibium, lead, bismuth, tin and the like are reserved in dearsenification residues as much as possible, the pure sodium arsenite solution is obtained through leachate purification and is used as the raw material of zinc sulfate solution arsenic salt purification and cobalt and nickel removal in zinc hydrometallurgy, harmless recycling of the arsennium is achieved, and valuable elements such as the stibium, the lead, the bismuth and the tin are recycled. The method is high in resource utilization rate and wide in raw material application range and solves the problem of pollution in the extraction process of the traditional process.

The invention discloses a method for assisted determination for an unknown arsenic form in wastewater based on an electrochemistry system. The method comprises the following steps: (1) establishing a three-electrode system: taking a gold electrode or a platinum electrode as a working electrode, taking a glassy carbon electrode as a counter electrode, and taking a saturated calomel electrode as a reference electrode; (2) preparing an experiment solution : using a sodium sulphate solution or a sulfuric acid solution as a supporting electrolyte to prepare the experiment solution, and using sodium arsenite, sodium arsenate, sodium carbonate and ferric sulfate to prepare an As (III)-CO32-(HCO3-) solution, an As (III)-Fe (III) solution and an As (V)-Fe (III) solution; (3) carrying out linear scanning detection. Based on the oxidation-reduction reaction and electrochemical principle of arsenic, the method adopts the linear scanning voltammetry of the three-electrode system to capture the change of a corresponding oxidation reduction potential when the arsenic form is changed, thereby predicting the unknown arsenic form in the wastewater containing arsenic. The method implements regulation and controlling for grasping the existing form of arsenic in the wastewater and provides methodology support for realization of deep purification.

The invention discloses a preparation method and application for an invertebrate recombinant ferritin based anti-tumor nano arsenic sphere. The preparation method is characterized in that the method includes the following steps: (1) obtaining invertebrate recombinant ferritin successively through gene amplification, the construction and prokaryotic expression of prokaryotic expression vectors andprotein purification; and (2) placing the invertebrate recombinant ferritin into a dialysis bag, performing dialysis in a 5 mM sodium arsenite solution, using a magnetic stirrer to simulate flowing liquid during a whole enrichment process, placing the dialysis bag into a protein buffer solution to perform dialysis for 12 h after 12 h of the dialysis, replacing the protein buffer solution every 4 h, taking the protein solution in the dialysis bag, and obtaining invertebrate recombinant ferritin based anti-tumor nano arsenic spheres after concentration. The preparation method has significant inhibition effects on the propagation of chronic granulocyte white blood cell K562 cells.

The present application relates to pharmaceutical compositions comprising a salt of arsenous acid, such as sodium meta arsenite or potassium meta arsenite, and methods of manufacturing the pharmaceutical compositions.

The invention discloses a reagent, a kit and a detection method for quantitative detection of blood iodine. The reagent comprises a first composition, wherein the first composition is a combination of acetonitrile and ethyl acetate or a combination of ammonium sulfate and isopropanol; a second composition which is a combination of sodium hypochlorite and sodium chloride; a third composition which is a combination of sulfuric acid and hydrochloric acid; a fourth composition which is a combination of sodium chloride and sodium arsenite; a fifth composition which is a composition of ferrous sulfate, phenanthroline and sulfuric acid; and a sixth composition which is a combination of ceric ammonium sulfate, cerous sulfate and sulfuric acid. According to the reagent and the method for rapidly detecting iodine in serum, the digestion solution is low in acidity, the operation is simple, convenient and rapid, and the method can be synchronously used in combination with detection equipment and is not easily influenced by manual errors of experimenters, so that the experimental result is accurate and stable.

The invention discloses a method for constructing a zebra-fish melanin deposition model. The method comprises the following steps: putting sexually mature zebra-fish into a mating fish tank according to male and female, and separating the male and female zebra-fish by inserting a separator; turning on a lamp to change water overnight, taking out the separator, and collecting roes after 30-60 minutes; placing the roes in a culture dish containing methylene blue, selecting fertilized fish eggs to a separated dish and adding embryo culture solution into the fertilized fish eggs for constant-temperature incubation; selecting well-developed fertilized eggs, randomly dividing the fertilized eggs into a control group and a sodium arsenite solution group, and carrying out constant-temperature culture; and performing microscopic observation on the cultured zebra-fish, and obtaining the zebra-fish melanin deposition model if the melanin generation of the sodium arsenite solution group is increased in comparison with the control group. According to the method, the zebra-fish melanin generation increasing model can be quickly established in a short time after treatment of the sodium arsenite solution. The zebra-fish is short in growth cycle, easy to reproduce, large in egg laying amount, small in size and easy to breed, so that the experimental requirements can be greatly reduced, and a simple, efficient and low-cost biological model is provided for the mechanism research of arsenic-induced skin pigmentation.