- Arsenic acid, magnesium salt
A white crystals or powder when pure.
Herbicide, Insecticide, Rodenticide
Registry Numbers and Inventories.
Agricultural Chemical and Pesticide
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
1345 - 1355
2.60-2.61 g/cm3 (20 C)
Solubility in water
Hazards and Protection.
Protect conatainer against physical damage. Store in well-ventilated area away from food or food products and combustible materials. Arsenic Storage site should be close to lab so that only small quantities required for experimentation need to be carried. Carcinogens should be kept in only one section of storage area, explosion-proof refrigerator or freezer as required. The area should be appropriately labeled. An inventory should be kept showing the quantity of carcinogen and date it was acquired. Facilities for dispensing should be contiguous to storage area.
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Escape from suddenly occurring respiratory hazards: respirator class(es): any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted acid gas canister having a high-efficiency particulate filter. Any appropriate escape-type, self-contained breathing apparatus.
Keep material out of water sources and sewers.
The pH of aqueous solutions appears to be a major factor in the relative stability. Is relatively stable at neutral or alkaline pH but undergoes reduction with decreasing pH.
When water solutions of arsenicals are in contact with active metals such as iron, aluminum, zinc, arsenic, emits highly toxic fumes of As. Arsenic cmpd strong oxidizers, bromine azide, note: Hydrogen gas can react with inorganic arsenic to form the highly toxic gas arsine.
When heated to decomposition it emits toxic fumes of arsenic including arsine.
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 itself does not burn or burns with difficulty.
Containers may explode when heated. Runoff may pollute waterways.
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
TLV (as As): ppm; 0.2 mg/m3 (ACGIH 1991-1992). MAK as As: ppm; 0.01 mg/m3; OSHA PEL (1987).
O, G-A1, I-1, N-1, CP65
Abnormally low blood pressure and rapid heart rate are common early signs. Fever and rapid breathing may occur. Elevated blood pressure has been associated with chronic environmental arsenic exposure. Altered mental status, seizures, toxic delirium, encephalopathy, and delayed peripheral neuropathy are complications of acute arsenic poisoning. Inorganic arsenic crosses the placenta and may result in spontaneous abortion or stillbirth with either acute or chronic poisoning.
Acute toxicity results in early symptoms of abdominal pain, severe vomiting and diarrhea, as well as dryness of the oral and nasal cavities.
Respiratory tract irritation may occur. Cardiogenic or noncardiogenic pulmonary edema and respiratory failure may develop in severe poisonings.
Skin findings may include hyperpigmentation, keratoses, and epidermoid carcinomas. Mee's lines of the nails are common. Trivalent arsenic compounds are corrosive to the skin. Arsenic trioxide and pentoxide are sensitizers.
As(III) is corrosive to the eyes, mouth, and mucous membranes. Perforation of the nasal septum can occur.
Gastric decontamination - aggressive decontamination with gastric lavage is recommended. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce 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. Remove material from skin immediately. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
Immediately flush with running water for at least 20 minutes.
Std. Transport #