Lead chromate

  • Chrome Yellow
  • Plumbous Chromate
  • Chromic acid, lead (II) salt (1:1)
Formula
PbCrO4
Structure
Description
Orange-yellow powder.
Uses
Decorating china, in chemical analysis of organic substances.

Registry Numbers and Inventories.
CAS
7758-97-6
EC (EINECS/ELINCS)
231-846-0
EC Index Number
082-004-00-2
EC Class
Carcinogenic Category 3; Toxic for reproduction Category 1; Toxic for reproduction Category 3; Danger of cumulative effects; Dangerous for the Environment
R 61 33 40 50/53 62
S 53 45 60 61
RTECS
GB2975000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen
UN (DOT)
3288
Merck
12,5422
Beilstein/Gmelin
36398 (G)
RCRA
D007
Swiss Giftliste 1
G-1264
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CrO4Pb
Formula mass
323.18
Melting point, °C
844
Saturation Concentration
Approximately zero
Density
6.023 g/cm3
Solubility in water
580 mg/L

Hazards and Protection.
Storage
Do not store near combustible materials. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid ingestion and inhalation. Keep away from clothing and other combustible materials. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Avoid generating dusty conditions. Provide ventilation. With a clean shovel, carefully pick up the material and place it into a clean dry container and cover for disposal. Keep combustibles (wood, paper, oil, etc.,) away from spilled material.
Disposal code
15
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Azodyestuffs (e.g. dinitroaniline orange and chlorinated para red), aluminum + dinitronaphthalene, sulfur tantalum, iron (III) hexacyanoferrate (4-), hydrazine, hydrogen peroxides, active metals, sodium, potassium, reducing agents.
Decomposition
Irritating and toxic fumes and gases, lead/lead oxides.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Combustion generates toxic fumes. Oxidizer. Greatly increases the burning rate of combustible materials. May accelerate burning if involved in a fire. Extinguishing media: Use water only! Cool containers with flooding quantities of water until well after fire is out. For large fires, flood fire area with water from a distance. DO NOT use dry chemicals, carbon dioxide, Halon or foams.
Fire potential
Non-Combustible
Hazards
Flammability and Flash point data are unavailable; this compound is probably non-flammable.
Combustion products
Dangerous; when heated it emits highly toxic fumes.
Health
2
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: ppm; 0.05 mg/m3 (as TWA) A2 as Pb (ACGIH 1991-1992) TLV (as Cr): 0.012 mg/m3 A2 (ACGIH 1991-1992)
Carcinogin
G-A1, I-1, N-1, CP65
Poison_Class
1
Exposure effects
May cause cancer in humans. Repeated exposure may cause sensitization dermatitis. Chronic exposure to lead may result in plumbism which is characterized by lead line in gum, headache, muscle weakness, mental changes, Laboratory experiments have resulted in mutagenic effects. Lead salts have been reported to cross the placeta and induce embryo- and feto- mortality.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Many lead compounds can cause toxic effects in the blood-forming organs, kidneys and central nervous
   Inhalation
Causes respiratory tract irritation. May cause effects similar to those described for ingestion.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
3288
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
CCD
 
HS Code
2841 20 00