Lead hydrogen arsenate - Wikipedia
Lead hydrogen arsenate, also called lead arsenate, acid lead arsenate or LA, chemical formula PbHAsO 4, is an inorganic insecticide used primarily against the potato beetle. [ citation needed ] Lead arsenate was the most extensively used arsenical insecticide. [ 2 ]
Lead Arsenate - an overview | ScienceDirect Topics
2001年9月11日 · Lead arsenate is used in insecticides and herbicides. Lead chromate is used as a yellow pigment in paints, rubber, plastics, and ceramic coatings. House paints must have <0.05% lead. Various arts and hobbies involve lead-containing materials.
Lead arsenate is currently used as a growth regulator on U.S. grapefruit crop. 10,000 pounds of lead arsenate are al annually to control cockroaches, silverfish and crickets.
Lead compounds - Wikipedia
The dioxide may be prepared by, for example, halogenization of lead (II) salts. The alpha allotrope is rhombohedral, and the beta allotrope is tetragonal. [6] Both allotropes are black-brown in color and always contain some water, which cannot be removed, as heating also causes decomposition (to PbO and Pb 3 O 4).
Lead arsenate | PbHAsO4 | CID 24572 - PubChem
2009年2月22日 · Lead arsenate is an inorganic lead salt composed from lead(2+) and arsenate dianion. It was widely used in the United States in the 1950's as an insecticide to control pests in fruit orchards, specifically apples and cherries.
Mimetite - Wikipedia
Mimetite is a lead arsenate chloride mineral (Pb 5 (AsO 4) 3 Cl) which forms as a secondary mineral in lead deposits, usually by the oxidation of galena and arsenopyrite. The name derives from the Greek Μιμητής mimetes, meaning "imitator" and refers to mimetite's resemblance to the mineral pyromorphite.
Arsenic - HyperPhysics
Mimetite, an arsenate of lead with chlorine, forms yellow crystals. Scorodite is an arsenate of iron (dark blue color) and reinerite is an arsenate of zinc. Bayldonite is an arsenate that contains copper, lead and zinc. Roselite is an arsenate that contains cobalt, magnesium and calcium and forms red crystals.
The major insoluble lead compounds include 17 inorganic lead compounds. Lead arsenate, lead azide, lead bromide, lead fluoride, lead phosphate, lead stearate, lead sulfate, and lead thiocyanate oc-cur as white powders, crystals, or needles. Lead carbonate occurs as colorless rhombic crystals, and lead fluoborate occurs as a colorless
Solubility and stability of lead arsenates at 25°C
Lead arsenates were the most extensively used arsenical insecticides in the past. Their residues, especially the water-soluble fractions in environment may pose a potential human health risk. The solubility products ( K sp ) and free energies of formation (Δ G f °) of PbHAsO 4 ·2H 2 O(c), Pb 5 (AsO 4 ) 3 OH·H 2 O(c), Pb 3 (AsO 4 ) 2 (c) and ...
Leaching of arsenic from treated lumber can increase soil arsenic near the wood. Lumberyard use of arsenicals as wood preservatives is a specific, legal treatment. Soils can be naturally high in arsenic, as reported at the upper ends of some valleys in Washington's Cascade Mountains.