Lead(II) hydrogen arsenate

  • Schultenite
Formula
PbHAsO4
Structure
Description
White, heavy powder. Odorless.

Registry Numbers and Inventories.
CAS
7784-40-9
EC (EINECS/ELINCS)
232-064-2
EC Index Number
082-011-00-0
EC Class
Carcinogenic Category 1; Toxic for reproduction Category 1; Toxic for reproduction Category 3; Toxic; Danger of cumulative effects; Dangerous for the Environment
RTECS
CG0980000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen
UN (DOT)
1617
Beilstein/Gmelin
36239 (G)
RCRA
D004
EPA OPP
13503
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
AsHO4Pb
Formula mass
347.13
Melting point, °C
720
Decomposition point, °C
>280
Density
5.79 g/cm3 (20 C)
Solubility in water
Slightly soluble
Refractive index
1.97 (20 C)

Hazards and Protection.
Storage
Store at separate from other stored items. Protect from physical damage. Do not handle with bare hands.
Handling
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.
Protection
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
Any self contained breathing apparatus with a full facepiece and operated in a pressure demand or other positive pressure mode or any supplied air respirator with a full facepiece and operated in a pressure demand or other positive pressure mode in combination with an auxiliary self contained breathing apparatus operated in pressure demand or other positive pressure mode.
Small spills/leaks
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. 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.
Stability
Stable to light, air and water and is not decomp by carbon dioxide; decomposed by alkalies; incl calcium hydroxide.
Decomposition
720 C (decomp) when heated to decomposition, emits very toxic fumes of lead and arsenic including arsine.

Fire.
Fire fighting
Water may be used to fight a fire in an area containing lead arsenates. use dry chemical, carbon dioxide, or water spray foam or fog in fires in a lead arsenate area.
Fire potential
Noncombustible.
Combustion products
When subjected to intense fire conditions, will decompose to form arsenic and lead oxides upon heating.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV (as Pb): ppm; 0.05 mg/m3 A3 (ACGIH 1996). MAK: ppm; 0.1 mg/m3; as Pb (1996).
Carcinogin
O, I-1, N-1, CP65
Exposure effects
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.
   Ingestion
Acute toxicity results in early symptoms of abdominal pain, severe vomiting and diarrhea, as well as dryness of the oral and nasal cavities.
   Inhalation
Respiratory tract irritation may occur. Cardiogenic or noncardiogenic pulmonary edema and respiratory failure may develop in severe poisonings.
   Skin
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.
   Eyes
As(III) is corrosive to the eyes, mouth, and mucous membranes. Perforation of the nasal septum can occur.

First aid
 
   Ingestion
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.
   Inhalation
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.
   Skin
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.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
1617
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
LAR