Magnesium arsenate

350.75300

349.75763 g/mol

233-285-7

I15RML7CUZ

1209

1622

DTXSID5047409

White powder

172.50000

-1.71200

DENSITY: 2.60-2.61; WHITE MONOCLINIC CRYSTALS /MG3(ASO4)2.8H2O/|DENSITY: 1.943 @ 15 °C; MONOCLINIC CRYSTALS; LOSES 5 H2O @ 100 °C; DECOMP IN COLD WATER /MGHASO4.7H2O/

Insoluble in water when pure|Solubility in water: none

Protect container against physical damage. Store in well ventilated area away from food or food products and combustible materials. /Inorganic arsenic cmpd/

WHITE CRYSTAL; DENSITY: 1.788; LOSES -17 H2O AT 100 °C; -21 H2O AT 220 °C; SOL IN ACID AND AMMONIUM CHLORIDE /MG3(ASO4)2.22H2O/|Technical material is highly hydrated ...

Insoluble in water.

Non-Redox-Active Inorganic Compounds

MAGNESIUM ARSENATE has generally low reactivity.

II

6.1(a)

UN 1622

R45; R22; R51/53; R68

S53; S45; S61

CG1050000

T; N

Stable. Non-combustible.

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.|Chemical Treatability of Arsenic; Concentration Process: Chemical Precipitation; Chemical Classification: Metal; Scale of Study: Pilot Scale; Type of Wastewater Used: Domestic Wastewater + Pure Compound; Results of Study: 5ppm @ 4gpm @ pH= 7.0. Iron system-90% reduction; low lime system-80% reduction; high lime system-76% reduction; (3 coagulant systems were used; Iron system used 45 ppm as Fe of Fe2(SO4)3 @ pH= 6.0. Low lime system used 20 ppm Fe of Fe2(SO4)3 and 260 ppm of CaO @ pH= 10.0. High lime system used 600 ppm of CaO @ pH= 11.5. Chemical coagulation was followed by multimedia filtration). /Arsenic cmpd/|Chemical Treatability of Arsenic; Concentration Process: Chemical Precipitation; Chemical Classification: Metal; Scale of Study: Full Scale Continuous Flow; Type of Wastewater Used: Domestic Wastewater; Results of Study: Effluent character (ppb): 2.5, 56% reduction with lime; 3.3, 24% reduction with lime; (lime dose of 350-400 ppm as calcium oxide @ pH= 11.3). /Arsenic cmpd/|Storage: To convert the gas-cleaning residues obtained during the metallurgical processing of arsenic-containing ores into a portable and less water-soluble form, the metals are precipitated as hydroxides by using an excess of lime water and the arsenic is precipitated as calcium arsenate and calcium arsenite. This "arsenic sludge" is recycled, on the one hand, in order not to lose the valuable metals, and on the other, in order to reduce the problem of arsenic sludge disposal. The following storage possibilities are available today for arsenic residues that cannot be recycled immediately or at all: special dumps sealed against the penetration of ground water, surface water and rain water; galleries in abandoned salt mines; concrete silos. In any case the sludge must be dewatered beforehand until it is compact. Recommendable methods: Precipitation, solidification, landfill. Not recommendable: Thermal destruction, discharge to sewer. Peer-review: Soluble arsenic cmpd should be converted to the insoluble sulfide before solidification. (Peer-review conclusions of an IRPTC expert consultation (May 1985)) /Arsenates and arsenites/

... WHEN WATER SOLN OF ARSENICALS ARE IN CONTACT WITH ACTIVE METALS SUCH AS ARSENIC, IRON, ALUMINUM, ZINC, ... HIGHLY TOXIC FUMES OF ARSENIC /INCLUDING ARSINE ARE RELEASED/. /ARSENIC CMPD/|Strong oxidizers, bromide azide [Note: Hydrogen gas can react with inorganic arsenic to form the highly toxic gas arsine.] /Arsenic (inorganic compounds, as As)/

U.S. Environmental Protection Agency's Integrated Risk Information System (IRIS) on Arsenic, inorganic (7440-38-2).[Available from the Substance File List as of March 15, 2000: http://www.epa.gov/iris/subst/index.html]|USEPA; Ambient Water Quality Criteria Doc: Arsenic p.A-2 (1980) EPA 440/5-80-021|IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Man. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work). Volume 84 (2004). Some Drinking-water Disinfectants and Contaminants, including Arsenic.[Available from, as of July 22, 2009: http://monographs.iarc.fr/ENG/Monographs/vol84/volume84.pdf]|National 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. Inorganic Arsenic Compounds are listed as known to be human carcinogens. /Arsenic Compounds, Inorganic/[Available from, as of July 31, 2009: http://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s015arse.pdf]

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways. (ERG, 2016)|Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. SPILL: Increase, in the downwind direction, as necessary, the isolation distance shown above. FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2016)

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. (ERG, 2016)

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection. Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible. (ERG, 2016)|Workers should be supplied with suitable protective clothing, protective boots and when there is a risk that the exposure limit for airborne arsenic will be exceeded, respiratory protective equipment. /Arsenic cmpd/|Where there is occupational exposure to inorganic arsenic compounds, protective clothing shall be provided by the employers. This may include underwear, gloves, coveralls, and a hood over the head and neck. /Inorganic arsenic/|Wear appropriate personal protective clothing to prevent skin contact. /Arsenic (inorganic cmpd, as As)/|Wear appropriate eye protection to prevent eye contact. /Arsenic (inorganic cmpd, as As)/|For more Personal Protective Equipment (PPE) (Complete) data for MAGNESIUM ARSENATE (6 total), please visit the HSDB record page.

If material involved in fire: Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use foam, dry chemical or carbon dioxide. /Magnesium arsenate, solid/|Personnel protection: ... Wear positive pressure self contained breathing apparatus when fighting fires involving this material. /Magnesium arsenate, solid/|If material involved in fire: Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use foam, dry chemical, or carbon dioxide. /Arsenical cmpd, liquid, NOS/|If material involved in fire: Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use foam, dry chemical, or carbon dioxide. /Arsenical cmpd, solid, NOS/|Personnel protection: ... Wear positive pressure self-contained breathing apparatus when fighting fires involving this material. /Arsenical cmpd, solid, NOS/

Prompt cleanup and removal are necessary. Control runoff and isolate discharged material for proper disposal.|Both arsenate and arsenite can be removed from the water column by co-precipitation or adsorption onto iron oxides. Arsenate species can also be removed by adsorption onto aluminum hydroxide and clays, while arsenite is readily adsorbed onto metal sulfides. /Arsenate and arsenite/|Floors and other accessible surfaces contaminated with inorganic arsenic may not be cleaned by the use of compressed air, and shoveling and brushing may be used only where vacuuming or other relevant methods have been tried and found not to be effective. /Inorganic arsenic compounds/

If material not involved in fire: Keep material out of water sources and sewers. /Magnesium arsenate, solid/|Personnel protection: Avoid breathing dusts, and fumes from burning material. Keep upwind. Avoid bodily contact with the material. ... Do not handle broken packages unless wearing appropriate personal protective equipment. Wash away any material which may have contacted the body with copious amounts of water or soap and water. ... If contact with the material anticipated, wear appropriate chemical protective clothing. /Magnesium arsenate, solid/|WELL VENTILATED & ALL POISONOUS FUME ... CONDENSED & DUST CONTENT REMOVED. ... EXHAUST HOODS ... WORKTABLES ... EQUIPPED WITH DOWN-DRAUGHT ... VENTILATION. /ARSENIC CMPD/|Clean work clothes should be supplied daily and the workers should shower prior to changing to street clothes. /Arsenic and arsenic cmpd/|For more Preventive Measures (Complete) data for MAGNESIUM ARSENATE (16 total), please visit the HSDB record page.

/GUIDE 151: SUBSTANCES - TOXIC (Non-combustible)/ Fire or Explosion: Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways.|/GUIDE 151: SUBSTANCES - TOXIC (Non-combustible)/ Health: Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.|/GUIDE 151: SUBSTANCES - TOXIC (Non-combustible)/ Public Safety: CALL Emergency Response Telephone Number on Shipping Paper first. If Shipping Paper not available or no answer, refer to appropriate telephone number listed on the inside back cover. As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. Keep unauthorized personnel away. Stay upwind. Keep out of low areas.|/GUIDE 151: SUBSTANCES - TOXIC (Non-combustible)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection. Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.|For more DOT Emergency Guidelines (Complete) data for MAGNESIUM ARSENATE (8 total), please visit the HSDB record page.

No person may /transport,/ offer or accept a hazardous material for transportation in commerce unless that person is registered in conformance ... and the hazardous material is properly classed, described, packaged, marked, labeled, and in condition for shipment as required or authorized by ... /the hazardous materials regulations (49 CFR 171-177)./|The International Air Transport Association (IATA) Dangerous Goods Regulations are published by the IATA Dangerous Goods Board pursuant to IATA Resolutions 618 and 619 and constitute a manual of industry carrier regulations to be followed by all IATA Member airlines when transporting hazardous materials.|The International Maritime Dangerous Goods Code lays down basic principles for transporting hazardous chemicals. Detailed recommendations for individual substances and a number of recommendations for good practice are included in the classes dealing with such substances. A general index of technical names has also been compiled. This index should always be consulted when attempting to locate the appropriate procedures to be used when shipping any substance or article.

ARSENICAL DUSTS ... ARE IRRITATING TO UPPER RESP TRACT & EYES. CONJUNCTIVITIS PRODUCED BY ... THESE SUBSTANCES ARE CHARACTERIZED BY ITCHING, BURNING, & WATERING OF EYES. ... /INORGANIC ARSENIC DUSTS/

8 hr Time-Weighted avg: 10 ug/cu m./Arsenic, inorganic cmpd (as As)/|Permissible Exposure Limit: Table Z-1 8-Hr Time Weighted Avg: 0.5 mg/cu m. /Arsenic, organic cmpd (as As)/

5 mg/cu m (as As); NIOSH considers arsenic (inorganic cmpd, as As) to be a potential occupational carcinogen. /Arsenic (inorganic cmpd, as As)/|Recommended Exposure Limit: 15 Ceiling Limit: (0.002 mg/cu m). /Arsenic (inorganic cmpd, as As)/|NIOSH usually recommends that occupational exposures to carcinogens be limited to the lowest feasible concentration. /Arsenic (inorganic compounds, as As)/

Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Vacuum with specialist equipment or carefully sweep into containers. Carefully collect remainder. Then store and dispose of according to local regulations.

Separated from strong oxidants and food and feedstuffs. Well closed. Store in an area without drain or sewer access.

A harmful concentration of airborne particles can be reached quickly when dispersed, especially if powdered.

The substance is irritating to the eyes and respiratory tract. The substance may cause effects on the gastrointestinal tract. This may result in severe gastroenteritis, loss of fluids and electrolytes, cardiac disorders and shock. Exposure far above the OEL could cause death. The effects may be delayed. Medical observation is indicated.

The substance may have effects on the skin, mucous membranes, peripheral nervous system, bone marrow and liver. This may result in pigmentation disorders, hyperkeratosis, perforation of the nasal septum, neuropathy, anaemia and liver impairment. This substance is carcinogenic to humans. Animal tests show that this substance possibly causes toxicity to human reproduction or development.

PREVENT DISPERSION OF DUST! AVOID ALL CONTACT!

Use closed system, ventilation or breathing protection.

Protective gloves. Protective clothing.

Wear face shield or eye protection in combination with breathing protection if powder.

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. Magnesium arsenate is included on this list.|(a) The owner or operator of an existing glass melting furnace subject to the provisions of this subpart shall comply with either paragraph (a)(1) or (a)(2) of this section ... (1) Uncontrolled total arsenic emissions from the glass melting furnace shall be less than 2.5 Mg (2.7 ton) per year, or ... (2) Total arsenic emissions from glass melting furnace shall be conveyed to a control device and reduced by at least 85%. /Total arsenic/|(b) The owner or operator of a new or modified glass melting furnace subject to the provisions of this subpart shall comply with either paragraph (b)(1) or (b)(2) of this section ... (1) Uncontrolled total arsenic emissions from the glass melting furnace shall be less than 0.4 Mg (0.44 ton) per year, or ... (2) Total arsenic emissions from glass melting furnace shall be conveyed to a control device and reduced by at least 85%. /Total arsenic/|The owner or operator of each copper converter subject to the provisions of this subpart shall reduce inorganic arsenic emissions to the atmosphere by meeting the following design, equipment, work practice, and operational requirements: (1) Install, operate, and maintain a secondary hood system on each copper converter. Each secondary hood system shall consist of a hood enclosure, air curtain fan(s), exhaust system fan(s), and ductwork that conveys the captured emission to a control device ... (2) Optimize the capture of secondary inorganic arsenic emission by operating the copper converter and secondary hood systems at all times ... . /Inorganic arsenic/|For more Atmospheric Standards (Complete) data for MAGNESIUM ARSENATE (6 total), please visit the HSDB record page.

D004; A waste containing arsenic may or may not be characterized as a hazardous waste following testing by the Toxicity Characteristic Leaching Procedure as prescribed by the Resource Conservation and Recovery Act (RCRA) regulations. /Arsenic/

LD50 Mouse oral 315 mg/kg

HOERNESITE|NATURAL ROESSLERITE

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. (ERG, 2016)|Carcinogens

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim calm and warm. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. (ERG, 2016)

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.

Rinse with plenty of water (remove contact lenses if easily possible). Refer for medical attention.

Basic treatment: Establish a patent airway. Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary ... . Monitor for shock and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with normal saline during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . /Magnesium and related compounds/|Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious or in severe respiratory distress. Positive pressure ventilation techniques with a bag-valve-mask device may be beneficial. Monitor cardiac rhythm and treat arrhythmias if necessary ... . Start an IV with D5W /SRP: "To keep open", minimal flow rate/. Use lactated Ringer's if signs of hypovolemia are present. Watch for signs of fluid overload. Consider drug therapy for pulmonary edema ... . For hypotension with signs of hypovolemia, administer fluid cautiously. Consider vasopressors for hypotension with a normal fluid volume. Watch for signs of fluid overload ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Magnesium and related compounds/

Magnesium arsenate is sometimes used to improve the color of the light in fluorescent bulbs. ... A 40 W tube coated with this powder contains about 1.8 g of arsenate. It is important to avoid the inhalation of the powder. ... A large proportion of the inhaled dust will finally reach the stomach via the throat. ... In gastric juice it dissolves readily. The acute action of magnesium arsenate is less toxic than that of arsenic trioxide ... .

The substance can be absorbed into the body by ingestion.

Cough. Sore throat.

Redness. Pain.

Arsenic acid (H3AsO4), magnesium salt (1:?): ACTIVE

Health Hazards -> Carcinogens