Dibenzo ( a , h ) anthracene

Structural formula
General
Surname	Dibenzo [ a , h ] anthracene
other names	Dibenz [ a , h ] anthracene; 1,2: 5,6-dibenzanthracene;
Molecular formula	C 22 H 14
Brief description	colorless solid
External identifiers / databases
EC number	200-181-8
ECHA InfoCard	100,000.166
PubChem	5889
Wikidata	Q4140494
properties
Molar mass	278.35 g mol −1
Physical state	firmly
density	1.28 g cm −3
Melting point	269.5 ° C
boiling point	524 ° C
solubility	practically insoluble in water; soluble in acetone , carbon disulfide , benzene , toluene , xylene , cyclohexane and most other organic solvents; slightly soluble in ethanol and ether ;
safety instructions
H and P phrases	H: 350-410
	P: 201-273-308 + 313-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dibenzo [ a , h ] anthracene is a chemical compound from the group of polycyclic aromatic hydrocarbons (PAH) and contains five linked six-membered rings.

Occurrence

Dibenzo [ a , h ] anthracene occurs ubiquitously as a pollutant in the environment (e.g. in tobacco smoke ) because it is a product of incomplete combustion of organic substances. It is largely associated with particulate matter, soils, and sediments. Its occurrence in places far from primary sources shows that it is relatively stable in the atmosphere and can be transported over long distances. In soils it is very strongly adsorbed and therefore not hydrolyzed and not released into the groundwater or the air. Biodegradation in soils has a half-life of 18 and 21 days. People are contaminated by polluted fine dust through breathing, ingested water or food.

This is why the compound is one of the polycyclic aromatic hydrocarbons that are monitored as relevant polycyclic aromatic hydrocarbons for the determination of benzo [ a ] pyrene emissions at a limited number of sampling points of the Federal Environment Agency .

Extraction and presentation

Dibenzo [ a , h ] anthracene can be prepared from methyl dinaphthyl ketone .

properties

Dibenzo [ a , h ] anthracene is a colorless solid. Its solution in sulfuric acid is red in color.

use

Dibenzo [ a , h ] anthracene is only used for scientific purposes and has no industrial significance.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on Dibenz (a, h) anthracene in the Hazardous Substances Data Bank , accessed on June 13, 2014.
↑ ^a ^b ^c ^d ^e Entry on Dibenz (a, h) anthracene in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
↑ Entry on Dibenz [a, h] anthracene in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on August 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
↑ NATIONAL PARK SERVICE WATER RESOURCES DIVISIONS Colorado: ENVIRONMENTAL CONTAMINANTS ENCYCLOPEDIA DIBENZ (A, H) ANTHRACENE [DIBENZO (A, H) ANTHRACENE] , July 1, 1997.
↑ Ordinance on air quality standards and maximum emissions (39th BImSchV): § 20 Regulations for the determination of arsenic, cadmium, nickel and benzo [a] pyrene and mercury , accessed on November 5, 2016.

[HSDB-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on Dibenz (a, h) anthracene in the Hazardous Substances Data Bank , accessed on June 13, 2014.

[GESTIS-2] Entry on Dibenz (a, h) anthracene in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .

[CLP_100.000.166-3] Entry on Dibenz [a, h] anthracene in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on August 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[4] NATIONAL PARK SERVICE WATER RESOURCES DIVISIONS Colorado: ENVIRONMENTAL CONTAMINANTS ENCYCLOPEDIA DIBENZ (A, H) ANTHRACENE [DIBENZO (A, H) ANTHRACENE] , July 1, 1997.

[5] Ordinance on air quality standards and maximum emissions (39th BImSchV): § 20 Regulations for the determination of arsenic, cadmium, nickel and benzo [a] pyrene and mercury , accessed on November 5, 2016.