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Cobaltsulfat
Cobalt Sulphate · CoSO4 · cobaltsulfate(coso4) · Cobaltsulfat · Cobalt(ii) sulphate · C026305 · cobaltbrown · Cobalt sulfate
Identifikatoren & physikalische Daten
| CAS No. | 10124-43-3 |
|---|---|
| Summenformel | CoO4S |
| Durchschnittliche Molmasse | 155 g/mol |
| Monoisotopische Masse | 154,884923 g/mol |
| SMILES | O=S(=O)([O-])[O-].[Co+2] |
| InChIKey | KTVIXTQDYHMGHF-UHFFFAOYSA-L |
| PubChem CID | 24965 |
| ChEBI | CHEBI:53470 |
| EC No. | 233-334-2 |
| DTXSID | DTXSID1031042 |
| Lokaler Name | Cobaltsulfat |
Chemische & physikalische Eigenschaften
| Polarare Oberfläche (TPSA) | 88,6 |
|---|---|
| H-Brücken-Donoren | 0 |
| H-Brücken-Akzeptoren | 4 |
| Frei drehbare Bindungen | 0 |
| Schwere Atome | 6 |
| Formalladung | 0 |
| Komplexität | 62 |
| pH | Acidic salts, such as cobalt sulfate ... resulting aqueous solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. |
| Geruch | Odorless |
| Dichte | 1.948 at 68 °F (USCG, 1999) - Denser than waterwill sink3.71 at 25 °C/4 °CLight red crystalline solidloses waters of crystallization when heated above 42 °C, producing the monohydrate at 100 °C and anhydrous salt above 250 °Cdensity: 2.01 kg/L at 25 °C /Cobalt(II) sulfate hexahydrate/Density: 1.948 g/cu cmloses heptahydrate at 420 °C /Cobalt(II) sulfate heptahydrate/3.71 g/cm³3.71 @25 °Cd425 3.71 |
| Color/Form | Red to lavender dimorphic, othorhombic crystalsRed orthorhombic crystalsRed powderRose-pink solid |
| Löslichkeit | Odorlessheat of solution: 23 BTU/lb= 13 cal/g= 0.54X10+5 J/kgsolubility: 35.040 lb/100 lb water at 70 °F /Cobaltous sulfate heptahydrate/In water, 330 g/L at 20 °C38.3 g/100 g water at 25 °CDissolves slowly in boiling water84 g/100 mL water at 100 °CFor more Solubility (Complete) data for Cobaltous sulfate (6 total), please visit the HSDB record page.H2O: solubledissolves slowly in boiling H2O [MER06]g/100g solution H2O: 19.7 ± 0.1 (0°C), 27.2 ± 0.1 (25°C), 27.8 (100°C)solid phase, CoSO4 · 7H2O (0°C, 25°C), CoSO4 ·H2O (100°C) [KRU93] |
| Decomposition | When heated to decomposition it emits toxic fumes of SOxThe substance decomposes on heating to 735 /deg/ C, producing toxic fumes of sulfur oxidesWhen heated to decomposition it emits toxic vapors of SOx and Co. /Cobalt sulfate heptahydrate/735 °C. This produces toxic fumes of sulfur oxides. The dust reacts with strong oxidants. This generates fire and explosion hazard. |
| Schmelzpunkt | 735 °Cdecomposes at 1140℃ [JAN85] |
| Physical Description | Cobalt sulfate is an odorless rose-pink solid. Sinks and mixes with water. (USCG, 1999)Dry PowderLarge CrystalsLiquidRed to lavender solid[Merck Index] Blue odorless powderSoluble in water (362 g/L at 20 deg C)[MSDSonline]LAVENDER-TO-DARK-BLUE CRYSTALS. |
| Stability/Shelf Life | Stable to 708 °C. |
| Relative Evaporation Rate | Evaporation at 20 °C is negligible |
| Other Experimental Properties | Stable to 708 °CMol wt: 281.10red-pink, monoclinic crystalsindex of refraction: 1.477, 1.483, 1.489density: 1.948 at 25 °C/25 °CMP: 96.8 °CBP: 420 °C (loses 7H2O)solubility: 60.4 g/100 cc water at 3 °C, 67 g/100 cc water at 70 °C, 2.5 g/100 cc alcohol at 3 °C, 54.5 g/100 cc methanol at 18 °C /Cobaltous sulfate heptahydrate/Mol wt: 263.08red monoclinic crystalsindex of refraction: 1.531, 1.549, 1.552density: 2.019 at 15 °C/15 °CMP: 95 °C (loses 2H2O) /Hexahydrate/Mol wt: 173.011density: 3.08 g/cu cmwater solubility 38.3 g/100 g water at 25 °C /Cobaltous sulfate monohydrate/Pink to red monoclinic, prismatic crystalson heating dehydrates to the hexahydrate (monoclinic prismatic crystala) at 41.5 °C, and to the monohydrate at 71 °C. /Cobaltous sulfate heptahydrate/Structure reported to be Co(H2SO5) /Cobaltous sultate monohydrate/ |
| Dampfdruck | 0Pa at 20℃ |
| Brechungsindex | 1.639 |
| Aggregatzustand | red orthorhombic crystals |
| Farbe | red orthorhombic crystals, crystalline |
| Geruch | Odorless |
| Merck | 13,2473 |
| InChI | InChI=1S/Co.H2O4S.H2O/c1-5(2,3)4/h(H2,1,2,3,4)1H2/q+2/p-2 |
| InChIKey | BGORGFZEVHFAQU-UHFFFAOYSA-L |
| SMILES | S([O-])([O-])(=O)=O.O.[Co+2] |
| LogP (Verteilungskoeffizient) | -1.031 (est) |
| CAS Datenbank | 10124-43-3(CAS DataBase Reference) |
| NIST chemische Informationen | Cobalt sulfate(10124-43-3) |
| EPA chemische Informationen | Cobalt(II) sulfate (10124-43-3) |
Sicherheit & Vorschriften
| GHS-Einstufung | DangerH302: Harmful if swallowed [Warning Acute toxicity, oral]H317: May cause an allergic skin reaction [Warning Sensitization, Skin]H334: May cause allergy or asthma symptoms or breathing difficulties if inhaled [Danger Sensitization, respiratory]H341: Suspected of causing genetic defects [Warning Germ cell mutagenicity]H350i: May cause cancer by inhalation [Danger Carcinogenicity]H360F ***: May damage fertility [Danger Reproductive toxicity]H400: Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]H410: Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]P203, P233, P260, P261, P264, P270, P271, P272, P273, P280, P284, P301+P317, P302+P352, P304+P340, P318, P321, P330, P333+P317, P342+P316, P362+P364, P391, P403, P405, and P501 (click each P-code to see the statement) |
|---|---|
| Regulatorische Informationen | Chemical: Sulfuric acid, cobalt(2+) salt (1:1)Hazard Traits - CarcinogenicityReproductive ToxicityRespiratory ToxicityAuthoritative List - EC Annex VI CMRs - Cat. 1BEC Annex VI Resp. Sens. - Cat. 1NTP RoC - reasonableProp 65Report - regardless of intended function of ingredient in the productSulfuric acid, cobalt(2+) salt (1:1) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Sulfuric acid, cobalt(2+) salt (1:1) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)Status: Active Update: 30-03-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/15094Status: Active Update: 03-11-2010 https://echa.europa.eu/registration-dossier/-/registered-dossier/1428Substance: Cobalt(II) sulphateEC: 233-334-2Date of inclusion: >15-Dec-2010Reason for inclusion: Carcinogenic (Article 57a)Toxic for reproduction (Article 57c)Cobalt (II) sulphate: Does not have an individual approval but may be used under an appropriate group standard |
| Weitere Sicherheitsinformationen | IMAP assessments - Soluble cobalt (II) and salts: Human health tier II assessment |
| Brandgefahren | Special Hazards of Combustion Products: Toxic cobalt oxide fumes may form in fire. (USCG, 1999)Not combustible. Gives off irritating or toxic fumes (or gases) in a fire. |
| Gesundheitsgefahren | Inhalation causes shortness of breath and coughingpermanent disability may occur. Ingestion causes pain and vomiting. Contact with eyes or skin causes irritation. (USCG, 1999) |
| Gefahrenübersicht | May cause skin sensitization and asthma after prolonged contact[ICSC] An irritantMay cause skin and respiratory sensitization after prolonged contact[MSDSonline] See Cobalt. |
| FDA-Anforderungen | Trace minerals added to animal feeds. These substances added to animal feeds as nutritional dietary supplements are generally recognized as safe when added at levels consistent with good feeding practice. All substances listed may be in anhydrous or hydrated form. Cobalt sulfate is included on this list. |
| Reaktive Gruppe | Salts, Acidic |
| EG-Einstufung | Symbol: T, NR: 49-60-22-42/43-68-50/53S: 53-45-60-61Note: E, 1 |
| Special Reports | DHHS/NTPNTP Report on the Toxicity Studies of Cobalt Sulfate Heptahydrate in F344/N Rats and B6C3F1 Mice (Inhalation Studies) NTP TOX 5 (1991) NIH Pub No. 91-3124National Toxicology Program. Eleventh Report on Carcinogens (2005). The Report on Carcinogens is an informational scientific and public health document that identifies and discusses substances (including agents, mixtures, or exposure circumstances) that may pose a carcinogenic hazard to human health. Cobaltous Sulfate (10124-43-3) is listed as reasonably anticipated to be a human carcinogen.[Available from, as of July 31, 2009: http://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s048zcob.pdf] |
| Reactivity Profile | Acidic salts, such as COBALT SULFATE, are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions. |
| Luftstandards | Listed as a hazardous air pollutant (HAP) generally known or suspected to cause serious health problems. The Clean Air Act, as amended in 1990, directs EPA to set standards requiring major sources to sharply reduce routine emissions of toxic pollutants. EPA is required to establish and phase in specific performance based standards for all air emission sources that emit one or more of the listed pollutants. Cobaltous sulfate is included on this list. |
| Chemical Dangers | Decomposes at 735 °C. This produces toxic fumes of sulfur oxides. The dust reacts with strong oxidants. This generates fire and explosion hazard. |
| Brandbekämpfung | In case of fire in the surroundings, use appropriate extinguishing media. |
| Erste-Hilfe-Maßnahmen | Fresh air, rest. Refer for medical attention.Remove contaminated clothes. Rinse and then wash skin with water and soap. Seek medical attention if you feel unwell.First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.Rinse mouth. Give one or two glasses of water to drink. Refer for medical attention . |
| Erste Hilfe | INHALATION: move to fresh airif breathing has stopped, begin artificial respiration and call a doctor.INGESTION: give large amount of waterinduce vomitingEYES: flush with water for at least 15 min.consult a physician if irritation persists.SKIN: flush with water. (USCG, 1999) |
| Sichere Lagerung | Separated from strong oxidants. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing. |
| Firefighting Hazards | High concentrations of dust may present a dust explosion hazard. |
| Expositionsschutz und Persönliche Schutzausrüstung | Biological Exposure Indices (BEI) [ACGIH] - Cobalt in urine = 15 ug/Lsample at end of shift at end of workweek |
| Brandbekämpfungsverfahren | Special firefighting procedures: None requiredhowever, when fighting chemical fires, self-contained breathing apparatus and protective clothing is recommended. |
| Lagerbedingungen | Separated from strong oxidants.This material should be stored in sealed containers to avoid dampness and dust. Partly used containers should be sealed. Otherwise, no special precautions are required. |
| Reinigungsverfahren | The spill should first be contained and the area should be cleaned by wet-sweeping or vacuum cleaning (HEPA filter). Minimize the creation of dust. Approved NIOSH respirator for dust should be worn.Liquid material spills can be copiously flushed with water and channeled to a treatment system or holding tank for reclamation or proper disposal. Spills of dry material can be removed by vacuuming or wet mopping. Some spills can be removed by hosing, first with a mist of water to dampen the spilled material and then with a more forceful stream that flushes it into a holding tank or other facility for handling contaminated water. Work surfaces or contaminated clothing should never be cleaned by dry sweeping or blowing with pressurized hoses. Recovery systems used to reclaim waste metals should comply with federal, state, and local regulations. All waste materials generated in the handling of cobalt-containing substances should be disposed of in compliance with federal, state, and local regulations. /Cobalt and cobalt salts/ |
| Entsorgungsverfahren | SRP: Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air qualitypotential migration in air, soil or watereffects on animal, aquatic and plant lifeand conformance with environmental and public health regulations. If it is possible or reasonable use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity or environmental contamination.Sweep spilled substance into containersif appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. Do NOT let this chemical enter the environment. |
| Verschüttetes entsorgen | Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. |
| Preventive Measures | Handling: Keep from freezing. Avoid contact with skin and eyes. Avoid breathing dust. Use only with adequate ventilation. Always use gloves and safety glasses when opening/emptying containers or processing this material. Do not eat or drink in work area. Wash in soap and water after exposure to any dust.Use local exhaust ventilation directed towards the source of dust and which is adequate to limit personal exposure to levels which do not exceed the PEL or TLV. If such equipment is not available use respirators ... .SRP: Local exhaust ventilation should be applied wherever there is an incidence of point source emissions or dispersion of regulated contaminants in the work area. Ventilation control of the contaminant as close to its point of generation is both the most economical and safest method to minimize personnel exposure to airborne contaminants. Ensure that the local ventilation moves the contaminant away from the worker.Employers should institute programs that emphasize good personal hygiene to prevent skin and respiratory irritation caused by cobalt containing dusts. After working with cobalt products, workers should thoroughly wash their hands and face before drinking, eating, or smoking. If skin contact with cobalt solutions occurs, the worker should wash the affected skin promptly. The employer should provide showers if workers have substantial contact with cobalt. These workers should be encouraged to wash or shower after each workshift. Employers should prohibit smoking or carrying of tobacco products, and should prohibit eating, food handling, or food storage within the work area. /Cobalt and cobalt salts/For more Preventive Measures (Complete) data for Cobaltous sulfate (6 total), please visit the HSDB record page. |
| Treatment | Treatment of cobalt poisoning is symptomatic. (L29) |
| Wechselwirkungen | The present study was carried out to investigate clearance of protoporphyrin IX (PpIX) in the presence of metal ions in the cream applied on healthy skin of mice in vivo. The photosensitizer PpIX was induced in normal mouse skin by topical application of 5-aminolevulinic acid (ALA). Fluorescence spectroscopy was used to study porphyrin kinetics. Topical application of ferrous, cobalt or zinc sulfate significantly diminished the fluorescence of PpIX in mouse skin. These results show that the clearance kinetics of PpIX observed after exogenous application of ALA are determined by the conversion of PpIX into heme, and not by the clearance of PpIX from the body. Application of a vehicle containing ferrous or cobalt sulfate after photodynamic therapy might be an approach in clinical practice for the reduction of cutaneous photosensitivity and elimination of undesirable photoreactions in skin and lesions.Near toxic concentrations of cadmium sulfate, mercuric chloride, and nickel sulfate reduced interferon action in tissue cultures, but increased intake by the intact mouse of lead acetate and mercuric chloride did not reduce interferon action. Lead and nickel given orally inhibited the protective activity of Newcastle disease virus against encephalomyocarditis virus-induced mortality, whereas cadmium, mercury, cobalt sulfate, and sodium arsenite given orally and deficiency of zinc did not influence this action. Excess lead and cobalt and deficiency of zinc, but not excess cadmium, mercury, or nickel, inhibited the protective activity of poly I/poly C against encephalomyocarditis virus-induced mortality. These results illustrate the various actions of increased concentrations of certain metals or a deficiency of zinc on interferon action or on actions of interferon inducers.In rats a combination of a protein deficient diet and cobalt administration, resulted in severe cardiomyopathy, showing cardiac damage remarkably similar to that seen in humans. Rats were preconditioned to protein restriction for ten days (4% casein in diet), then received cobalt sulfate by oral gavage for two weeks. Cobalt sulfate, containing from 4.0 to 12.5 mg cobalt/kg bw/day was administered, severe cardiomyopathy was seen in those animals receiving 12.5 mg cobalt/kg bw/day in combination with the low protein diet. |
| Gesundheitliche Auswirkungen | Exposure to high amount of cobalt can cause heart, lung, kidney, and liver damage. Skin contact is known to result in contact dermatitis. Cobalt may also have mutagenic and carcinogenic effects. (L29, L30) |
| Ökotoxizitätswerte | EC50Species: Tetrahymena pyriformis (Ciliate) exponential growth phase (log), stratin GL 1000 cells/mLConditions: freshwater, static, 25 °C, pH 7Concentration: 4890 ug/L for 1 hrEffect: biochemistry, decreased fluorescence /> or =98% purity/LC50Species: Daphnia magna (Water Flea) age 12 hr neonate, fedConditions: freshwater, static, 20.4 °C, pH 8.35, hard water, alkalinity 234 mg/L CaCO3, dissolved oxygen 7.93 mg/LConcentration: 7370 ug/L for 48 hr /Technical/Species: Daphnia magna (Water Flea) age 12 hr neonate, not fedConcentration: 6830 ug/L for 48 hr (95% confidence interval: 5100-8990 ug/L) /Technical/Species: Daphnia magna (Water Flea) organisms at different life stages, neonate-adultConditions: freshwater, renewal, 20.3 °C, pH 8.31, hard water, alkalinity 198 mg/L CaCO3, dissolved oxygen 7.44 mg/LConcentration: 27 ug/L for 28 days /Technical/For more Ecotoxicity Values (Complete) data for Cobaltous sulfate (9 total), please visit the HSDB record page. |
| Umweltverhalten | ATMOSPHERIC FATE: Inorganic cobalt compounds are nonvolatile and released into the atmosphere in particulate form(1). Particulate-phase cobalt compounds are removed from the air by wet and dry deposition(SRC). Cobalt has been detected in atmospheric deposition(2) and in rain-snow precipitation(3). |
| Unerwünschte Wirkungen | Skin Sensitizer - An agent that can induce an allergic reaction in the skin.Asthma - Reversible bronchoconstriction (narrowing of bronchioles) initiated by the inhalation of irritating or allergenic agents.IARC Carcinogen - Class 2: International Agency for Research on Cancer classifies chemicals as probable (2a), or possible (2b) human carcinogens.NTP Carcinogen - Reasonably anticipated to be a human carcinogen. |
| Expositionspfade | The substance can be absorbed into the body by inhalation and by ingestion.Inhalation (L29)oral (L29)dermal (L29) |
| Toxizitätsübersicht | IDENTIFICATION: Cobalt sulfate is a red powder. It is used in storage batteriesin cobalt-electroplating bathsas drier for lithographic inks, and varnishesin ceramics, enamels, and glazes to prevent discoloringin cobalt pigments for decorating porcelain. HUMAN EXPOSURE AND TOXICITY: Cardiomyopathy has been observed in individuals who consume large quantities of beer where cobalt sulfate was added as a foam stabilizer. Repeated or prolonged contact may cause skin sensitization. Repeated or prolonged inhalation exposure may cause asthma. The substance may have effects on the heart, thyroid and bone marrow, resulting in cardiomyopathy, goiter and polycythemia. ANIMAL STUDIES: Rats and mice exposed short term to cobalt sulfate by inhalation exhibited necrosis and inflammation of the respiratory tract epithelium. Rats developed thymus necrosis and testicular atrophy. Rats exposed for 2-3 months to cobalt sulfate in the diet for 24 weeks had significant reductions in heart enzyme activity levels. Rats and mice were exposed to cobalt sulfate heptahydrate by inhalation 6 hr/day, 5 days/week for 13 weeks developed adverse effects throughout the respiratory system. At higher concentrations both rats and mice developed squamous metaplasia of the larynx. At high doses, rats developed chronic inflammation of the larynx along with more severe effects in the nose, larynx and lung. Mice exhibited acute inflammation of the nose, larynx and lungs. Mice also exhibited hyperplasia of the mediastinal lymph nodes and testicular atrophy and increased esterous cycle in females. Both rats and mice exhibited histiocytic infiltrates of the lung at similar exposure levels. Sperm motility was decreased in mice and mice that received high dosages developed increased abnormal sperm and decreased testis and epididymal weights. Rats exposed for 2-3 months of copper sulfate in the diet exhibited increased heart weight and degenerative heart lesions. Rats exposed to cobalt sulfate in their dieCobalt is believed to exhibit its toxicity through a oxidant-based and free radical-based processes. It produces oxygen radicals and may be oxidized to ionic cobalt, causing increased lipid peroxidation, DNA damage, and inducing certain enzymes that lead to cell apoptosis. Cobalt has also been shown to block inorganic calcium channels, possibly impairing neurotransmission. Cobalt can also chelate lipoic acids, impairing oxidation of pyruvate or fatty acids. In addition, cobalt may inhibit DNA repair by interacting with zinc finger DNA repair proteins, and has also been shown to inhibit heme synthesis and glucose metabolism. Cobalt may activate specific helper T-lymphocyte cells and interact directly with immunologic proteins, such as antibodies (IgA and IgE) or Fc receptors, resulting in immunosensitization. (L29) |
| Signs and Symptoms | Cough. Sore throat. Shortness of breath.Redness. Pain.Nausea. Vomiting. Abdominal pain.Cobalt inhalation can cause asthma-like breathing problems. Skin contact is known to result in contact dermatitis, which is characterized by irritation and rashes. Ingesting large amounts of cobalt may cause nausea and vomiting. (L2090) |
| Ongoing Test Status | The following link will take the user to the National Toxicology Program (NTP) Test Status of Agents Search page, which tabulates the results and current status of tests such as "Short-Term Toxicity Studies", "Long-term Carcinogenicity Studies", "Developmental Studies", "Genetic Toxicology Studies", etc., performed with this chemical. Testing status for cobalt sulfate heptahydrate is available. /Cobalt sulfate heptahydrate/[Available from, as of March 24, 2017: https://ntpsearch.niehs.nih.gov/?e=True&ContentType=Testing+Status] |
| ICSC Environmental Data | The substance is toxic to aquatic organisms. The substance may cause long-term effects in the aquatic environment. It is strongly advised not to let the chemical enter into the environment. |
| Natural Pollution Sources | Cobaltous sulfate (hexahydrate/heptahydrate) occurs in nature as the mineral bieberite(1,2). Bieberite is an uncommon oxidation product of cobalt-bearing sulfide-arsenides minerals(3). |
| Wassergefährdungsklasse (WGK) | 2 |
| TSCA-Inventar-Status | TSCA listed |
| UN-Transportnummer | UN 3082 9/PG 3 |
| R-Sätze (R) | 49-42/43-51/53-50/53-22-68-60 |
| Gefahrensymbole | T,N |
| Sicherheitshinweise (S) | 53-23-36/37-45-61-60-22 |
| Lagerklasse | 6.1C - Combustible acute toxic Cat.3toxic compounds or compounds which causing chronic effects |
| Gefahrstoffdaten | 10124-43-3(Hazardous Substances Data) |
| Gefahrenklasse | Acute Tox. 4 OralAquatic Acute 1Aquatic Chronic 1Carc. 1B InhalationEye Irrit. 2Muta. 2Repr. 1BResp. Sens. 1Skin Sens. 1 |
Anwendungen & Verwendung
Beschreibung
The blue, crystalline hydrate Co2(SO4)3.18H2O is prepared by the oxidation of cobalt(II) sulphate in 8N sulphuric acid either electrolytically or chemically with ozone or fluorine. It is stable in the dry state, but is decomposed by water with evolution of oxygen; it is fairly stable in solution in dilute sulphuric acid. Cobalt(III) alums MCo(SO4)2.12H2O (M = K, Rb, Cs or NH4) can be isolated as blue crystals from the mixed cooler solutions of the two sulphates in dilute sulphuric acid. The potassium alum is diamagnetic, the rubidium salt has a magnetic moment less than 1 B.M. and the ammonium alum has a moment of 2.1 B.M. at 304°K. The hydrated sulphate also has a small positive magnetic susceptibility. The sulphate is believed like the alums to contain the [Co(H2O)6]3+ ion.
Verwenden
Ceramics, pigments, glazes, in plating baths for cobalt, additive to soils, catalyst, paint and ink drier, storage batteries.