Chromic acid (H2Cr2O7), sodium salt (1:1) Safety Data Sheets
SAFETY DATA SHEETS
According to the UN GHS revision 8
SECTION 1: Identification
1.1 GHS Product identifier
| Product name | Dichromic acid, sodium salt |
|---|
1.2 Other means of identification
| Product number | - |
|---|---|
| Other names | - |
1.3 Recommended use of the chemical and restrictions on use
| Identified uses | Intermediates,Pigments,Plating agents and surface treating agents,Processing aids, specific to petroleum production |
|---|---|
| Uses advised against | no data available |
1.4 Supplier's details
| Company | Echemi.com |
|---|---|
| Address | Echemi.com |
| Telephone | Echemi.com |
1.5 Emergency phone number
| Emergency phone number | Echemi.com |
|---|---|
| Service hours | Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours). |
SECTION 2: Hazard identification
2.1 Classification of the substance or mixture
no data available
2.2 GHS label elements, including precautionary statements
| Pictogram(s) | no data available |
|---|---|
| Signal word | no data available |
| Hazard statement(s) | no data available |
| Precautionary statement(s) | |
| Prevention | no data available |
| Response | no data available |
| Storage | no data available |
| Disposal | no data available |
2.3 Other hazards which do not result in classification
no data available
SECTION 3: Composition/information on ingredients
3.1 Substances
| Chemical name | Common names and synonyms | CAS number | EC number | Concentration |
|---|---|---|---|---|
| Dichromic acid, sodium salt | Dichromic acid, sodium salt | 34493-01-1 | 252-062-5 | 100% |
SECTION 4: First-aid measures
4.1 Description of necessary first-aid measures
If inhaled
Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.
Following skin contact
First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. Refer for medical attention .
Following eye contact
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.
Following ingestion
Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention .
4.2 Most important symptoms/effects, acute and delayed
Inhalation of dust or mist causes respiratory irritation sometimes resembling asthma; nasal septal perforation may occur. Ingestion causes vomiting, diarrhea, and (rarely) stomach and kidney complications. Contact with eyes or skin produces local irritation; repeated skin exposure causes dermatitis. (USCG, 1999)
4.3 Indication of immediate medical attention and special treatment needed, if necessary
Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR if necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. Poisons A and B
SECTION 5: Fire-fighting measures
5.1 Suitable extinguishing media
Suitable extinguishing media: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide. Sodium Dichromate Dihydrate
5.2 Specific hazards arising from the chemical
Behavior in Fire: Decomposes to produce oxygen when heated. May ignite other combustibles upon contact. (USCG, 1999)
5.3 Special protective actions for fire-fighters
Wear self-contained breathing apparatus for firefighting if necessary.
SECTION 6: Accidental release measures
6.1 Personal precautions, protective equipment and emergency procedures
Avoid dust formation. Avoid breathing mist, gas or vapours.Avoid contacting with skin and eye. Use personal protective equipment.Wear chemical impermeable gloves. Ensure adequate ventilation.Remove all sources of ignition. Evacuate personnel to safe areas.Keep people away from and upwind of spill/leak.
6.2 Environmental precautions
Personal protection: complete protective clothing including self-contained breathing apparatus. Sweep spilled substance into covered non-combustible containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. Do NOT absorb in saw-dust or other combustible absorbents. Do NOT let this chemical enter the environment.
6.3 Methods and materials for containment and cleaning up
ACCIDENTAL RELEASE MEASURES: Personal precautions, protective equipment and emergency procedures: Wear respiratory protection. Avoid dust formation. Avoid breathing vapors, mist or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Avoid breathing dust; Environmental precautions: Prevent further leakage or spillage if safe to do so. Do not let product enter drains. Discharge into the environment must be avoided; Methods and materials for containment and cleaning up: Sweep up and shovel. Contain spillage, and then collect with an electrically protected vacuum cleaner or by wetbrushing and place in container for disposal according to local regulations. Keep in suitable, closed containers for disposal. Sodium Dichromate Dihydrate
SECTION 7: Handling and storage
7.1 Precautions for safe handling
Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.
7.2 Conditions for safe storage, including any incompatibilities
Dry. Provision to contain effluent from fire extinguishing. Separated from combustible substances, reducing agents and food and feedstuffs. Well closed. Store in an area without drain or sewer access.Keep container tightly closed in a dry and well-ventilated place. Storage class (TRGS 510): Oxidizing hazardous materials Sodium Dichromate Dihydrate
SECTION 8: Exposure controls/personal protection
8.1 Control parameters
Occupational Exposure limit values
| Component | Dichromic acid, sodium salt |
|---|---|
| CAS No. | 34493-01-1 |
| Recommended Exposure Limit: 8-hour Time-Weighted Average: 0.5 mg Cr/cu m. /Chromium metal, chromium(II) and chromium(III) compounds/ Recommended Exposure Limit: 8-hour Time-Weighted Average: 0.0002 mg Cr(VI)/cu m. NIOSH considers all Cr(VI) compounds (including chromic acid, tert-butyl chromate, zinc chromate, and chromyl chloride) to be potential occupational carcinogens. /All hexavalent chromium (Cr(VI) compounds/ NIOSH usually recommends that occupational exposures to carcinogens be limited to the lowest feasible concentration. /Chromic acid and chromates/ |
Biological limit values
no data available
8.2 Appropriate engineering controls
Ensure adequate ventilation. Handle in accordance with good industrial hygiene and safety practice. Set up emergency exits and the risk-elimination area.
8.3 Individual protection measures, such as personal protective equipment (PPE)
Eye/face protection
Wear tightly fitting safety goggles with side-shields conforming to EN 166(EU) or NIOSH (US).
Skin protection
Wear fire/flame resistant and impervious clothing. Handle with gloves. Gloves must be inspected prior to use. Wash and dry hands. The selected protective gloves have to satisfy the specifications of EU Directive 89/686/EEC and the standard EN 374 derived from it.
Respiratory protection
If the exposure limits are exceeded, irritation or other symptoms are experienced, use a full-face respirator.
Thermal hazards
no data available
SECTION 9: Physical and chemical properties and safety characteristics
| Physical state | Sodium dichromate is a red or red-orange crystalline solid. May be strongly irritating to skin, eyes and mucous membranes. Used as a corrosion inhibitor, and in the manufacture of other chemicals. |
|---|---|
| Colour | Light-brown to orange-red plates which are strongly hygroscopic |
| Odour | Odorless |
| Melting point/freezing point | 675° F (USCG, 1999) |
| Boiling point or initial boiling point and boiling range | 400 deg C (decomposes) |
| Flammability | Not combustible but enhances combustion of other substances. |
| Lower and upper explosion limit/flammability limit | no data available |
| Flash point | no data available |
| Auto-ignition temperature | Not flammable (USCG, 1999) |
| Decomposition temperature | 400°C |
| pH | Solutions are acidic, pH of 1% soln 4.0 and pH of 10% soln 3.5. |
| Kinematic viscosity | no data available |
| Solubility | In water, 187 g/100 g water at 25 deg C |
| Partition coefficient n-octanol/water | no data available |
| Vapour pressure | no data available |
| Density and/or relative density | 2.35 at 77° F (USCG, 1999) |
| Relative vapour density | no data available |
| Particle characteristics | no data available |
SECTION 10: Stability and reactivity
10.1 Reactivity
250 mg/cu m (as Cr(II)). Chromium(II) compounds (as Cr)
25 mg/cu m (as Cr(III)). Chromium(III) compounds (as Cr)
15 mg/cu m (as Cr(VI)). Chromic acid and chromates
NIOSH considers chromic acid and chromates to be potential occupational carcinogens. Chromic acid and chromates
The substance is a strong oxidant. It reacts with combustible and reducing materials. The solution in water is a weak acid.
10.2 Chemical stability
Stable under recommended storage conditions. Sodium Dichromate Dihydrate
10.3 Possibility of hazardous reactions
Violent reaction or ignition with boron + silicon (pyrotechnic); organic residues + sulfuric acid; 2-propanol + sulfuric acid; sulfuric acid + trinitrotoluene.SODIUM DICHROMATE is a strong oxidizing agent. Incompatible with strong acids. (NTP, 1992). Contact with combustible materials may lead to fires. Toxic chromium oxide fumes may form in fire (USCG, 1999). The well known "chromic acid mixture" of dichromate and sulfuric acid with organic residue led to violent exothermic reaction. This mixture in combination with acetone residue also led to violent reaction. The combination of the dichromate and sulfuric acid with alcohols, ethanol and 2-propanol, led to violent exothermic reaction. Because of the occurrence of many incidents involving the dichromate-sulfuric acid mix with oxidizable organic materials, it is probably best to avoid such interactions. The combination of the dichromate with hydrazine is explosive (one may expect the reaction of the dichromate to be vigorous with amines in general), [Mellor, 1943, Vol. 11, 234]. The addition of the dehydrated dichromate salt to acetic anhydride led to an exothermic reaction which eventually exploded. An induction period proceeded the explosion event [Bretherick, 5th Ed., 1995]. Boron, silicon, and dichromates form pyrotechnic mixtures. A mixture of acetic acid, 2-methyl-2-pentenal and the dichromate led to a runaway reaction and eruption of the reactor contents, [J. Haz. Mat., 1987, 233-239].
10.4 Conditions to avoid
no data available
10.5 Incompatible materials
Incompatible materials: Strong reducing agents, alcohols. Sodium Dichromate Dihydrate
10.6 Hazardous decomposition products
Decomposition at about 400 deg C
SECTION 11: Toxicological information
Acute toxicity
- Oral: LD50 Rat oral 50 mg/kg
- Inhalation: no data available
- Dermal: no data available
Skin corrosion/irritation
no data available
Serious eye damage/irritation
no data available
Respiratory or skin sensitization
no data available
Germ cell mutagenicity
no data available
Carcinogenicity
Cancer Classification: Group A Human Carcinogen by Inhalation; Group D Not Classifiable as to Human Carcinogenicity by Oral Route
Reproductive toxicity
no data available
STOT-single exposure
no data available
STOT-repeated exposure
no data available
Aspiration hazard
no data available
SECTION 12: Ecological information
12.1 Toxicity
- Toxicity to fish: LC50; Species: /Oncorhynchus mykiss/ (rainbow trout); Conditions: flow through, measured, water hardness 45 mg/L as calcium carbonate; Concentration: 69,000 ug/L for 96 hr
- Toxicity to daphnia and other aquatic invertebrates: LC50; Species: Daphnia magna (Water Flea) age <24 hr neonate, clone A; Conditions: freshwater, renewal, 20 deg C; Concentration: 524 ug/L for 21 days (95% confidence interval: 405-677 ug/L)
- Toxicity to algae: no data available
- Toxicity to microorganisms: no data available
12.2 Persistence and degradability
Sodium dichromate is reported to be non-biodegradable based on results of the Japanese MITI test(1); however, BOD values and test protocols were not reported(SRC).
12.3 Bioaccumulative potential
Using carp (Cyprinus carpio) which were exposed over a 4-week period to sodium dichromate dihydrate concentrations of 1 and 0.1 mg/L, the BCF ranged from <3.6 to <36(1). According to a classification scheme(2), this BCF range suggests that bioconcentration in aquatic organisms is low(SRC).
12.4 Mobility in soil
no data available
12.5 Other adverse effects
no data available
SECTION 13: Disposal considerations
13.1 Disposal methods
Product
The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.
Contaminated packaging
Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.
SECTION 14: Transport information
14.1 UN Number
| ADR/RID: no data available | IMDG: no data available | IATA: no data available |
14.2 UN Proper Shipping Name
| ADR/RID: no data available | IMDG: no data available | IATA: no data available |
14.3 Transport hazard class(es)
| ADR/RID: no data available | IMDG: no data available | IATA: no data available |
14.4 Packing group, if applicable
| ADR/RID: no data available | IMDG: no data available | IATA: no data available |
14.5 Environmental hazards
| ADR/RID: No | IMDG: No | IATA: No |
14.6 Special precautions for user
no data available
14.7 Transport in bulk according to IMO instruments
no data available
SECTION 15: Regulatory information
15.1 Safety, health and environmental regulations specific for the product in question
| Chemical name | Common names and synonyms | CAS number | EC number |
|---|---|---|---|
| Dichromic acid, sodium salt | Dichromic acid, sodium salt | 34493-01-1 | 252-062-5 |
| European Inventory of Existing Commercial Chemical Substances (EINECS) | Listed. | ||
| EC Inventory | Listed. | ||
| United States Toxic Substances Control Act (TSCA) Inventory | Not Listed. | ||
| China Catalog of Hazardous chemicals 2015 | Not Listed. | ||
| New Zealand Inventory of Chemicals (NZIoC) | Not Listed. | ||
| Philippines Inventory of Chemicals and Chemical Substances (PICCS) | Not Listed. | ||
| Vietnam National Chemical Inventory | Not Listed. | ||
| Chinese Chemical Inventory of Existing Chemical Substances (China IECSC) | Not Listed. | ||
| Korea Existing Chemicals List (KECL) | Listed. | ||
SECTION 16: Other information
Information on revision
| Creation Date | July 15, 2019 |
|---|---|
| Revision Date | July 15, 2019 |
Abbreviations and acronyms
- CAS: Chemical Abstracts Service
- ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
- RID: Regulation concerning the International Carriage of Dangerous Goods by Rail
- IMDG: International Maritime Dangerous Goods
- IATA: International Air Transportation Association
- TWA: Time Weighted Average
- STEL: Short term exposure limit
- LC50: Lethal Concentration 50%
- LD50: Lethal Dose 50%
- EC50: Effective Concentration 50%
References
- IPCS - The International Chemical Safety Cards (ICSC), website: http://www.ilo.org/dyn/icsc/showcard.home
- HSDB - Hazardous Substances Data Bank, website: https://toxnet.nlm.nih.gov/newtoxnet/hsdb.htm
- IARC - International Agency for Research on Cancer, website: http://www.iarc.fr/
- eChemPortal - The Global Portal to Information on Chemical Substances by OECD, website: http://www.echemportal.org/echemportal/index?pageID=0&request_locale=en
- CAMEO Chemicals, website: http://cameochemicals.noaa.gov/search/simple
- ChemIDplus, website: http://chem.sis.nlm.nih.gov/chemidplus/chemidlite.jsp
- ERG - Emergency Response Guidebook by U.S. Department of Transportation, website: http://www.phmsa.dot.gov/hazmat/library/erg
- Germany GESTIS-database on hazard substance, website: http://www.dguv.de/ifa/gestis/gestis-stoffdatenbank/index-2.jsp
- ECHA - European Chemicals Agency, website: https://echa.europa.eu/
Disclaimer: The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. We as supplier shall not be held liable for any damage resulting from handling or from contact with the above product.
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