Lead (II) arsenate

Structural formula
Space group	P 2 1 / c (No. 14)
General
Surname	Lead (II) arsenate
other names	Lead arsenate Lead orthoarsenate Lead or arsenate, neutral Triple arsenate
Molecular formula	Pb 3 (AsO 4 ) 2
Brief description	white solid
External identifiers / databases
CAS number 3687-31-8 EC number 222-979-5 ECHA InfoCard 100.020.890 PubChem 3032448 Wikidata Q2864490
properties
Molar mass	899.41 g mol −1
Physical state	firmly
density	5.80 g cm −3 , other source 7.8 g cm −3
solubility	slightly soluble in water soluble in nitric acid
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 301-331-350-360Df-373-410 P: ?
Authorization procedure under REACH	of particular concern : toxic for reproduction ( CMR )
MAK	Switzerland: 0.1 mg m −3 (based on arsenic / lead, measured as inhalable dust )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Lead (II) arsenate is an inorganic chemical compound of lead from the group of arsenates .

Occurrence

Lead (II) arsenate occurs in complex raw materials for the production of copper, lead and a number of precious metals. It is converted into calcium arsenate and diarsenic trioxide in the metallurgical refining process .

properties

Lead (II) arsenate is a white solid that is sparingly soluble in water. It decomposes when heated above 1042 ° C, producing arsenic , arsenic oxides and lead compounds . It has a monoclinic crystal structure with the space group P 2 ₁ / c (space group no. 14) . There is also a high temperature modification with the space group P 6 ₃ / m (No. 176) .

Extraction and presentation

Lead arsenate can be obtained by reacting lead acetate or lead nitrate with sodium arsenate .

${\displaystyle \mathrm {3\ Pb(NO_{3})_{2}+2\ Na_{3}AsO_{4}\ \longrightarrow \ Pb_{3}(AsO_{4})_{2}\downarrow +\ 6\ NaNO_{3}} }$

use

Lead (II) arsenate was used as a pesticide.

safety instructions

Due to its carcinogenic and reproductive properties, lead (II) arsenate is on the list of substances of very high concern .

Individual evidence

1. ↑ ^{a b c d e f} Entry on lead (II) arsenate in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
2. ^ ^{A b} R. Blachnik: Pocket book for chemists and physicists Volume 3: Elements, inorganic compounds and materials, minerals . Springer-Verlag, 2013, ISBN 978-3-642-58842-6 , pp. 656 ( limited preview in Google Book search).
3. ^ William M. Haynes: CRC Handbook of Chemistry and Physics, 96th Edition . CRC Press, 2015, ISBN 978-1-4822-6097-7 , pp. 70 ( limited preview in Google Book search).
4. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entries on lead compounds with the exception of those specified elsewhere in this Annex and arsenic acid and its salts with the exception of those specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on March 18, 2017. Manufacturers or distributors can expand the harmonized classification and labeling .
5. ↑ Entry in the SVHC list of the European Chemicals Agency , accessed on October 19, 2015.
6. ↑ Swiss Accident Insurance Fund (Suva): Limit values ​​- current MAK and BAT values (search for 3687-31-8 or lead (II) arsenate ), accessed on October 24, 2016.
7. ↑ REACH: REACH-CLP-Biocide Helpdesk - Information on the candidate substance / Federal Office for Chemicals / Authorization of Biocides / Federal Institute for Occupational Safety and Health ( Memento of September 24, 2015 in the Internet Archive ), accessed on September 5, 2015
8. ↑ K. Viswanathan, G. Miehe: The crystal structure of low temperature Pb (AsO). In: Journal of Crystallography . 148, 1978, p. 275, doi : 10.1524 / zkri.1978.148.3-4.275 .
9. ↑ Michael C. Newman, Michael A. Unger: Fundamentals of Ecotoxicology, Second Edition . CRC Press, 2002, ISBN 978-1-56670-598-1 , pp. 28 ( limited preview in Google Book search).
10. ↑ Percival J. Fryer: Insect Pests and Fungus Diseases of Fruit and Hops . Cambridge University Press, 2015, ISBN 978-1-107-54455-0 , pp. 403 ( limited preview in Google Book search).