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Physical & Chemical properties

Additional physico-chemical information

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Administrative data

Endpoint:
other: various
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable, well-documented publication meeting basic scientific principles.

Data source

Reference
Reference Type:
publication
Title:
Occupational health aspects of quartz in pulverized coal fly ash in Israel
Author:
Nathan, Y. et al.
Year:
2009
Bibliographic source:
International Workshop on Environmental Aspects of Coal Ash Utilization 15 - 16 December 2009, Tel Aviv Israel, see http://www.coal-ash.co.il/english/news_work_prog_2009.html

Materials and methods

Principles of method if other than guideline:
1) Determination of the concentration of quartz in coal fly ash dust samples
2) Analyses of selected particles of various sizes: <10 µm and 20-40 µm (tracing element)

X-ray diffraction and scanning electron microscopy were applied to differentiate between coated and uncoated particles. A semi-quantitative chemical analysis of the particles was done with use of a digimap software (Secondary Electrons (SE) microphotograph, a Back-Scattered (BS) microphotograph and 7 element maps of the concentration of Na, Mg, Al, Si, S, K and Ca).
GLP compliance:
no

Test material

Constituent 1
Reference substance name:
pulverized coal fly ash
IUPAC Name:
pulverized coal fly ash

Results and discussion

Results:
The quartz concentration in the respirable fraction of the fly ash produced in Israel is considerably lower than in the whole ash. Most of the quartz particles in the respirable fraction are coated by amorphous aluminosilicate layers. Coated particles are not considered to have pneumoconiotic effects.

Applicant's summary and conclusion