3D Mol Similar

Lead chromate

: Iupac Name：dioxido(dioxo)chromium;lead(2+); CAS No.: 7758-97-6; Molecular Weight：323.1937; Modify Date.: 2023-04-28 06:28; Introduction:
Lead chromate (CAS 7758-97-6) is a compound with the chemical formula PbCrO4. It is a bright yellow solid that is insoluble in water. Lead chromate is commonly used as a pigment in paints, due to its vibrant yellow color. It is also used in ceramics, plastics, and glass manufacturing. However, it is important to note that lead chromate is highly toxic and poses health risks, especially through inhalation or ingestion. Exposure to lead chromate can lead to various health issues, including damage to the respiratory system, kidneys, and nervous system. Therefore, proper safety precautions should be taken when handling or working with lead chromate.
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1. Names and Identifiers

: 1.1 Name; Lead chromate; 1.2 Synonyms; canarychromeyellow40-2250 CHROME YELLOW Chromium, diolatodioxo-, lead(2+) salt (1:1) EINECS 231-846-0 LEAD (II) CHROMATE SINTERED LEAD CHROMATE, PRECIPITATED LEAD(+2)CHROMATE Lead(2+) dioxido(dioxo)chromium Lead(2+) hydroxide - chromium hydrate (1:2:1:2) LEAD(II) CHROMATE LEIPZIG YELLOW MFCD00011158 PIGMENT GREEN 15; View all

1.3 CAS No.: 7758-97-6

1.4 CID: 24460

1.5 EINECS(EC#): 231-846-0

1.6 Molecular Formula: CrO4Pb (isomer)

1.7 Inchi: InChI=1S/Cr.4O.Pb/q;;;2*-1;+2

1.8 InChIkey: MOUPNEIJQCETIW-UHFFFAOYSA-N

1.9 Canonical Smiles: [O-][Cr](=O)(=O)[O-].[Pb+2]

1.10 Isomers Smiles: [O-][Cr](=O)(=O)[O-].[Pb+2]

2. Properties

2.1 Density: 6.3

2.1 Melting point: 844℃

2.1 Boiling point: 分解

2.1 Refractive index: Index of refraction: 2.31, 2.37 (Li /lamp/), 2.66

2.1 Precise Quality: 323.89700

2.1 PSA: 80.26000

2.1 logP: -0.85600

2.1 Solubility: Insoluble. <0.1 g/100 mL at 19 ºC

2.2 Appearance: yellow to orange powder

2.3 Storage: Ambient temperatures.

2.4 Chemical Properties: Lead chromate is an orange or orange-yellowcrystalline solid or powder.

2.5 Physical Properties: Yellow monoclinic crystals; refractive index 2.31; density 6.12 g/cm3; melts at 844°C; decomposes on further heating; insoluble in water; also insoluble in ammonia and acetic acid; soluble in acids and alkalies.

2.6 Color/Form: Yellow or orange-yellow powder
Monoclinic crystals
Orthorhombic: yellow crystals; monoclinic: orange crystals; tetragonal: red crystals

2.7 Decomposition: When heated to decomposition it emits toxic fumes of /inorganic lead/

2.8 Odor: Odorless

2.9 PH: Bivalent chromium compounds are basic

2.10 Water Solubility: Insoluble.

2.11 Spectral Properties: INDEX OF REFRACTION: 2.31, 2.37 (LI), 2.66

2.12 Stability: Stable. Reacts violently with ferric ferrocyanide.

3. Use and Manufacturing

3.1 Definition: ChEBI: A chromium coordination entity comprising chromate and lead(2+) ions in a 1:1 ratio

3.2 Potential Exposure: Lead chromate is used to make paintpigments for wood and metal

3.3 Shipping: UN3085 Oxidizing solid, corrosive, n.o.s,Hazard Class: 5.1; Labels: 5.1-Oxidizer, 8-Corrosive material, Technical Name Required.

3.4 Usage: Lead chromate occurs in nature as the minerals, crocoite and phoenicochroite. It is an important pigment of lead used in oil paints and water colors. It is used for printing textiles and coloring porcelain.

4. Safety and Handling

4.1 Symbol: GHS08, GHS09

4.1 Hazard Codes: T; N

4.1 Signal Word: Danger

4.1 Risk Statements: R33;R40;R50/53;R61;R62

4.1 Safety Statements: S13;S20/21

4.1 Packing Group: III

4.1 Other Preventative Measures: Persons not wearing protective equipment and clothing should be restricted from areas of spills until cleanup has been completed.
SRP: Contaminated protective clothing should be segregated in such a manner so that there is no direct personal contact by personnel who handle, dispose, or clean the clothing. Quality assurance to ascertain the completeness of the cleaning procedures should be implemented before the decontaminated protective clothing is returned for reuse by the workers. All contaminated clothing should not be taken home at end of shift, but should remain at employee's place of work for cleaning.
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.
1) The employer shall ensure that all personal protective devices are inspected regularly and maintained in clean and satisfactory working condition. 2) Working clothing and shoes shall not be taken home by employees. The employer shall provide for maintenance and laundering of protective clothing. 3) The employer shall ensure that precautions necessary to protect laundry personnel are taken when soiled protective clothing is laundered. /Inorganic lead/
PRECAUTIONS FOR "CARCINOGENS": Smoking, drinking, eating, storage of food or of food & beverage containers or utensils, & the application of cosmetics should be prohibited in any laboratory. All personnel should remove gloves, if worn, after completion of procedures in which carcinogens have been used. They should ... wash ... hands, preferably using dispensers of liq detergent, & rinse ... thoroughly. Consideration should be given to appropriate methods for cleaning the skin, depending on nature of the contaminant. No standard procedure can be recommended, but the use of organic solvents should be avoided. Safety pipettes should be used for all pipetting. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": In animal laboratory, personnel should remove their outdoor clothes & wear protective suits (preferably disposable, one-piece & close-fitting at ankles & wrists), gloves, hair covering & overshoes. ... Clothing should be changed daily but ... discarded immediately if obvious contamination occurs ... /also,/ workers should shower immediately. In chemical laboratory, gloves & gowns should always be worn ... however, gloves should not be assumed to provide full protection. Carefully fitted masks or respirators may be necessary when working with particulates or gases, & disposable plastic aprons might provide addnl protection. If gowns are of distinctive color, this is a reminder that they should not be worn outside of lab. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Operations connected with synth & purification ... should be carried out under well-ventilated hood. Analytical procedures ... should be carried out with care & vapors evolved during ... procedures should be removed. ... Expert advice should be obtained before existing fume cupboards are used ... & when new fume cupboards are installed. It is desirable that there be means for decreasing the rate of air extraction, so that carcinogenic powders can be handled without ... powder being blown around the hood. Glove boxes should be kept under negative air pressure. Air changes should be adequate, so that concn of vapors of volatile carcinogens will not occur. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Vertical laminar-flow biological safety cabinets may be used for containment of in vitro procedures ... provided that the exhaust air flow is sufficient to provide an inward air flow at the face opening of the cabinet, & contaminated air plenums that are under positive pressure are leak-tight. Horizontal laminar-flow hoods or safety cabinets, where filtered air is blown across the working area towards the operator, should never be used ... Each cabinet or fume cupboard to be used ... should be tested before work is begun (eg, with fume bomb) & label fixed to it, giving date of test & avg air-flow measured. This test should be repeated periodically & after any structural changes. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Principles that apply to chem or biochem lab also apply to microbiological & cell-culture labs ... Special consideration should be given to route of admin. ... Safest method of administering volatile carcinogen is by injection of a soln. Admin by topical application, gavage, or intratracheal instillation should be performed under hood. If chem will be exhaled, animals should be kept under hood during this period. Inhalation exposure requires special equipment. ... Unless specifically required, routes of admin other than in the diet should be used. Mixing of carcinogen in diet should be carried out in sealed mixers under fume hood, from which the exhaust is fitted with an efficient particulate filter. Techniques for cleaning mixer & hood should be devised before expt begun. When mixing diets, special protective clothing &, possibly, respirators may be required. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": When ... admin in diet or applied to skin, animals should be kept in cages with solid bottoms & sides & fitted with a filter top. When volatile carcinogens are given, filter tops should not be used. Cages which have been used to house animals that received carcinogens should be decontaminated. Cage-cleaning facilities should be installed in area in which carcinogens are being used, to avoid moving of ... contaminated /cages/. It is difficult to ensure that cages are decontaminated, & monitoring methods are necessary. Situations may exist in which the use of disposable cages should be recommended, depending on type & amt of carcinogen & efficiency with which it can be removed. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": To eliminate risk that ... contamination in lab could build up during conduct of expt, periodic checks should be carried out on lab atmospheres, surfaces, such as walls, floors & benches, & ... interior of fume hoods & airducts. As well as regular monitoring, check must be carried out after cleaning-up of spillage. Sensitive methods are required when testing lab atmospheres. ... Methods ... should ... where possible, be simple & sensitive. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Rooms in which obvious contamination has occurred, such as spillage, should be decontaminated by lab personnel engaged in expt. Design of expt should ... avoid contamination of permanent equipment. ... Procedures should ensure that maintenance workers are not exposed to carcinogens. ... Particular care should be taken to avoid contamination of drains or ventilation ducts. In cleaning labs, procedures should be used which do not produce aerosols or dispersal of dust, ie, wet mop or vacuum cleaner equipped with high-efficiency particulate filter on exhaust, which are avail commercially, should be used. Sweeping, brushing & use of dry dusters or mops should be prohibited. Grossly contaminated cleaning materials should not be re-used ... If gowns or towels are contaminated, they should not be sent to laundry, but ... decontaminated or burnt, to avoid any hazard to laundry personnel. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Doors leading into areas where carcinogens are used ... should be marked distinctively with appropriate labels. Access ... limited to persons involved in expt. ... A prominently displayed notice should give the name of the Scientific Investigator or other person who can advise in an emergency & who can inform others (such as firemen) on the handling of carcinogenic substances. /Chemical Carcinogens/; View all

4.2 Hazard Class: 6.1

4.2 Hazard Declaration: H350-H360Df-H373-H410

4.2 Cleanup Methods: PRECAUTIONS FOR "CARCINOGENS": A high-efficiency particulate arrestor (HEPA) or charcoal filters can be used to minimize amt of carcinogen in exhausted air ventilated safety cabinets, lab hoods, glove boxes or animal rooms ... Filter housing that is designed so that used filters can be transferred into plastic bag without contaminating maintenance staff is avail commercially. Filters should be placed in plastic bags immediately after removal ... The plastic bag should be sealed immediately ... The sealed bag should be labelled properly ... Waste liquids ... should be placed or collected in proper containers for disposal. The lid should be secured & the bottles properly labelled. Once filled, bottles should be placed in plastic bag, so that outer surface ... is not contaminated ... The plastic bag should also be sealed & labelled. ... Broken glassware ... should be decontaminated by solvent extraction, by chemical destruction, or in specially designed incinerators. /Chemical Carcinogens/; View all

4.3 DisposalMethods: Generators of waste (equal to or greater than 100 kg/mo) containing this contaminant, EPA hazardous waste number D008, must conform with USEPA regulations in storage, transportation, treatment and disposal of waste.
Chemical Treatability of Lead; Concentration Process: Biological Treatment; Chemical Classification: Metal; Scale of Study: Respirometer Study; Results of Study: Oxygen uptake inhibited.
The report describes a bench scale fluidized bed incinerator that will capture trace metals on the bed material when firing hazardous waste. The design is based on limited tests at an existing laboratory facility. Operating conditions, operating procedures, and equipment design are established for greater than 90 percent trace metal capture on the bed material. A surrogate hazardous waste, paint containing lead chromate, was used in the tests. Other trace metals were identified that can be captured by agglomeration on a silica bed material. The design provides the capability of operating in either a single or double stage configuration so that various bed materials or operating conditions can be used to capture different trace metals or to provide more effective capture.
PRECAUTIONS FOR "CARCINOGENS": There is no universal method of disposal that has been proved satisfactory for all carcinogenic compounds & specific methods of chem destruction ... published have not been tested on all kinds of carcinogen-containing waste. ... summary of avail methods & recommendations ... /given/ must be treated as guide only. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Incineration may be only feasible method for disposal of contaminated laboratory waste from biological expt. However, not all incinerators are suitable for this purpose. The most efficient type ... is probably the gas-fired type, in which a first-stage combustion with a less than stoichiometric air:fuel ratio is followed by a second stage with excess air. Some ... are designed to accept ... aqueous & organic-solvent solutions, otherwise it is necessary ... to absorb soln onto suitable combustible material, such as sawdust. Alternatively, chem destruction may be used, esp when small quantities ... are to be destroyed in laboratory. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": HEPA (high-efficiency particulate arrestor) filters ... can be disposed of by incineration. For spent charcoal filters, the adsorbed material can be stripped off at high temp & carcinogenic wastes generated by this treatment conducted to & burned in an incinerator. ... LIQUID WASTE: ... Disposal should be carried out by incineration at temp that ... ensure complete combustion. SOLID WASTE: Carcasses of lab animals, cage litter & misc solid wastes ... should be disposed of by incineration at temp high enough to ensure destruction of chem carcinogens or their metabolites. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Small quantities of ... some carcinogens can be destroyed using chem reactions ... but no general rules can be given. ... As a general technique ... treatment with sodium dichromate in strong sulfuric acid can be used. The time necessary for destruction ... is seldom known ... but 1-2 days is generally considered sufficient when freshly prepd reagent is used. ... Carcinogens that are easily oxidizable can be destroyed with milder oxidative agents, such as saturated soln of potassium permanganate in acetone, which appears to be a suitable agent for destruction of hydrazines or of compounds containing isolated carbon-carbon double bonds. Concn or 50% aqueous sodium hypochlorite can also be used as an oxidizing agent. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Carcinogens that are alkylating, arylating or acylating agents per se can be destroyed by reaction with appropriate nucleophiles, such as water, hydroxyl ions, ammonia, thiols & thiosulfate. The reactivity of various alkylating agents varies greatly ... & is also influenced by sol of agent in the reaction medium. To facilitate the complete reaction, it is suggested that the agents be dissolved in ethanol or similar solvents. ... No method should be applied ... until it has been thoroughly tested for its effectiveness & safety on material to be inactivated. For example, in case of destruction of alkylating agents, it is possible to detect residual compounds by reaction with 4(4-nitrobenzyl)-pyridine. /Chemical Carcinogens/; View all

4.4 RIDADR: UN 1759

4.4 Caution Statement: P201-P260-P280-P308 + P313

4.4 Formulations/Preparations: Chrome yellows /contain/ ... 52-98% lead chromate ...

4.5 Incompatibilities: Incompatible with oxidizers (chlorates,nitrates, peroxides, permanganates, perchlorates, chlorine,bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases,strong acids, oxoacids, epoxides, and active metals; hydrazine, sodium, and potassium; organics at elevated temperature. Reacts with aluminum dinitronaphthalene, iron(III)hexacyanoferrate (IV) Lead chromate Preparation Products And Raw materials Preparation Products

4.6 WGK Germany: 3

4.6 RTECS: GB2975000

4.6 Reactivities and Incompatibilities: During grinding operations, the intimate mixture /of lead chromate and iron(3+) hexacyanoferrate(4-)/ was ignited by a spark and burned fiercely. Spontaneous ignition of Brunswick Green pigment (which also contains lead sulfate) soon after grinding was not uncommon, and similar incidents had led to the loss of ships with cargoes of Prussian Blue or Brunswick Green in wooden casks. The mixture /of lead chromate and sulfur/ is pyrophoric. The mixture /of lead chromate and tantalum/ is a pyrotechnic composition.
Considerable energy is released by the mixture /of lead chromate and aluminum dinitronaphthalene/ derived from chromate-catalyzed exothermic decomposition of the nitro compound, coupled with a thermite-type reaction of the aluminum and chromate.
Under certain conditions, dry mixtures of lead chromate pigments with the G & O azo-dyes ... dinitroaniline orange or ... chlorinated para-red may lead to violent explosions during mixing or blending operations.

4.7 Safety: R33:Dangerofcummulativeeffects.;R40:Possiblerisksofirreversibleeffects.;R50/53:Verytoxictoaquaticorganisms,maycauselong-termadverseeffectsintheaquaticenvironment.;R61:Maycauseharmtotheunbornchild.;R62:Possibleriskofimpairedfertility.;

5. MSDS

2.Hazard identification

2.1 Classification of the substance or mixture

Carcinogenicity, Category 1B

Specific target organ toxicity \u2013 repeated exposure, Category 2

Hazardous to the aquatic environment, short-term (Acute) - Category Acute 1

Hazardous to the aquatic environment, long-term (Chronic) - Category Chronic 1

Reproductive toxicity, Category 1A

2.2 GHS label elements, including precautionary statements

Pictogram(s)
Signal word	Danger
Hazard statement(s)	H350 May cause cancer H373 May cause damage to organs through prolonged or repeated exposure H410 Very toxic to aquatic life with long lasting effects H360Df
Precautionary statement(s)
Prevention	P201 Obtain special instructions before use. P202 Do not handle until all safety precautions have been read and understood. P280 Wear protective gloves/protective clothing/eye protection/face protection. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P273 Avoid release to the environment.
Response	P308+P313 IF exposed or concerned: Get medical advice/ attention. P314 Get medical advice/attention if you feel unwell. P391 Collect spillage.
Storage	P405 Store locked up.
Disposal	P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification

none

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6. Other Information

6.0 Merck: 14,5405

6.1 Physical Properties: Yellow monoclinic crystals; refractive index 2.31; density 6.12 g/cm3; melts at 844°C; decomposes on further heating; insoluble in water; also insoluble in ammonia and acetic acid; soluble in acids and alkalies.

Lead chromate is used in the production of commercial lead chromate pigments, such as Primrose Chrome Yellow, Light Chrome Yellow and Medium Chrome Yellow, containing 65-89% lead chromate (IARC 1990).
Lead chromate(VI) is also used in the preparation of green pigments such as chrome green or green cinnabar, in which it is mixed with Prussian blue (qq.v.). It is also listed by the Colour Index as a component of Pigment Green 15.

6.2 Occurrence and Uses: Lead chromate occurs in nature as the minerals, crocoite and phoenicochroite. It is an important pigment of lead used in oil paints and water colors. It is used for printing textiles and coloring porcelain.

6.3 History: Lead chromate(VI), PbCrO4, also known as plumbous chromate, was first synthesised around 1800, with its potential use as a pigment first reported by Berthollet and Vauquelin in 1804. According to Vauquelin (1809), it was prepared by adding lead acetate or lead nitrate to potassium chromate, and the shade of the precipitate could be varied (from yellow to orange or red) by adjusting the acidity/alkalinity of the products. Lead chromate( VI), which occurs naturally as the rare mineral crocoite (Rutley, 1988), is known as the pigment chrome yellow (qq.v.). It is listed by the Colour Index (1971) as CI Pigment Yellow 34 (CI 77600). The commercial manufacture of the pigment was largely influenced by the availability of suitable raw materials (usually in the form of the abundant mineral chromite, FeCr2O4). The earliest record of the use of chrome yellow is in a painting by Sir Thomas Lawrence dated prior to 1810 (Kühn, 1969). Sources of the pigment are reported by Harley (1982, citing Field, 1809) to be available by 1814-15, with Bollman (1769-1821) cited as the first commercial manufacturer in England, with production beginning around 1814-16.; View all

6.4 Production: Lead chromate is found naturally in minerals crocoite and phoenicochroite. It also is readily prepared by adding a soluble chromate such as sodium or potassium chromate to a solution of lead nitrate, lead acetate or other soluble lead(II) salt in neutral or slightly acidic solution:
Pb²⁺ + CrO4^2ˉ → PbCrO4
The yellow precipitate is filtered, washed and dried.

6.5 Toxicity: Moderately toxic by intraperitoneal route. The effects, however, are mild from oral intake. Occupational exposure may cause cancer. There is sufficient evidence of carcinogenicity in animals and humans.

6.6 Chemical Properties: Lead chromate is an orange or orange-yellow crystalline solid or powder.

6.7 Uses: It is used in chemical analysis of organic substances. pigment for paints and inks; in oil and water colors; printing fabrics, decorating china and porcelain; in chemical analysis of organic substances; in traffic paints.

6.8 Uses: Lead chromate (PbCrO4) is found in nature as yellow crystals in the mineral crocoite. It can be produced by reacting lead chloride and sodium dichromate. It is a popular and safe yellow pigment.

6.9 Uses: Lead chromate, “chrome yellow” PbCrO4, yellow precipitate, by reaction of soluble lead salt solution and sodium dichromate or chromate solution.Used as a pigment; basic lead chromate, red solid, insoluble, formed by heating lead chromate and sodium hydroxide solution.

6.10 Definition: ChEBI: A chromium coordination entity comprising chromate and lead(2+) ions in a 1:1 ratio

6.11 Health Hazard: Lead chromate is a suspected human lung carcinogen and can cause chronic lead poisoning.

6.12 Potential Exposure: Lead chromate is used to make paint pigments for wood and metal

6.13 Shipping: UN3085 Oxidizing solid, corrosive, n.o.s, Hazard Class: 5.1; Labels: 5.1-Oxidizer, 8-Corrosive material, Technical Name Required.

6.14 Incompatibilities: Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, and active metals; hydrazine, sodium, and potassium; organics at elevated temperature. Reacts with aluminum dinitronaphthalene, iron(III) hexacyanoferrate (IV)

7. Computational chemical data

Molecular Weight: 323.1937g/mol
Molecular Formula: CrO₄Pb
Compound Is Canonicalized: True
XLogP3-AA: null
Exact Mass: 323.89682
Monoisotopic Mass: 323.89682
Complexity: 62.2
Rotatable Bond Count: 0
Hydrogen Bond Donor Count: 0
Hydrogen Bond Acceptor Count: 4
Topological Polar Surface Area: 80.3
Heavy Atom Count: 6
Defined Atom Stereocenter Count: 0
Undefined Atom Stereocenter Count: 0
Defined Bond Stereocenter Count: 0
Undefined Bond Stereocenter Count: 0
Isotope Atom Count: 0
Covalently-Bonded Unit Count: 2
CACTVS Substructure Key Fingerprint: AAADcQAAOAAAAACAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==

8. Question & Answer

Why is it lead(II) chromate and not lead(II) chromate(VI) tetraoxide? Aug 24 2021
I am just beginning in chemistry and learning how to name the different molecules. I have this molecule: PbCrOX4" style="position: relative;" tabindex="0" id="MathJax-Element-2-Frame" class="MathJax"..

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Chromic acid (H2CrO4),lead(2+) salt (1:1)