Nomenclature
CAS number: 1317-36-8
Lead oxide (PbO); lead (II) oxide; lead oxide yellow; plumbous oxide; litharge; massicot; lead protoxide.
OPb; mol wt 223.20.
O 7.17%, Pb 92.83%.
PbO.
Description and references
Prepn of high purity PbO: Kwestroo, Huizing, J. Inorg. Nucl. Chem. 27, 1591
(1965); Kwestroo et al., ibid. 29, 39 (1967). Mfg processes: Faith, Keyes & Clark's Industrial Chemicals, F. A.
Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed.,
1975) pp 509-513. Toxicity study: W. R. Bradley, W. G. Fredrick, Ind. Med. 10, Ind. Hyg. Sect. 2, 15 (1941). Review of toxicology
and human exposure: Toxicological Profile
for Lead (PB99-166704, 1999) 640 pp.
Properties
Exists in two forms: red to reddish-yellow, tetragonal
crystals, stable at ordinary temp; yellow, orthorhombic crystals,
stable above 489°: Petersen, J. Am. Chem.
Soc. 63, 2617 (1941). Poisonous. At 300-450° in the air, it converts slowly
into Pb3O4, but at higher temp reverts to PbO.
d 9.53. mp 888°. Insol in water, alcohol.
Sol in acetic acid, dil HNO3, in warm solns of fixed alkali
hydroxides. LD50 i.p. in rats: 40 mg
Pb/100g (Bradley, Fredrick).Use
In ointments, plasters; preparing soln of lead subacetate.
Glazing pottery; glass flux for painting on porcelain and glass;
lead glass; varnishes; with glycerol as metal cement; producing iridescent
colors on brass and bronze; coloring sulfur-containing substances,
e.g., hair, nails, wool, horn; manuf artificial tortoise shell
and horn; pigment for rubber; manuf boiled linseed oil; in assay of
gold and silver ores.