Physical and chemical characterization of McIntyre Powder: An aluminum dust inhaled by miners to combat silicosis.
McIntyre Powder (MP) is a finely ground aluminum powder that was used between 1943 and 1979 as a prophylaxis for silicosis. Silicosis is a chronic lung disease caused by the inhalation of crystalline silica dust and was prevalent in the Canadian mining industry during this time period. The McIntyre...
| Publicado en: | Journal of Occupational & Environmental Hygiene Vol. 16; no. 11; pp. 745 - 757 |
|---|---|
| Autores principales: | , , , , , , , , , |
| Formato: | pictorial research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Nov2019
|
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=139385262&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 139385262 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Nov2019 vid: 16 iid: 11 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 139385262 139385262 139385262 10.1080/15459624.2019.1657581 139385262 ppf: 745 ppct: 12 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Physical and chemical characterization of McIntyre Powder: An aluminum dust inhaled by miners to combat silicosis. aug: au: Zarnke, Andrew Rasmussen, Pat E. David, Marie-Odile Eidi, Housam Kennedy, Konnor Hedges, Kevin Irick, Todd Thome, Christopher Pirkkanen, Jake Boreham, Douglas affil: Laurentian University, Ontario, Canada sug: subj: Aluminum Analysis Powders Analysis Dust Analysis Occupational Exposure Analysis Mining Military Services Blue Collar Workers Aluminum Therapeutic Use Powders Therapeutic Use Pneumoconiosis Prevention and Control Human Spectrometry, X-Ray Emission Methods Aluminum Hydroxide Analysis Microscopy, Electron Methods Nanoparticles ab: McIntyre Powder (MP) is a finely ground aluminum powder that was used between 1943 and 1979 as a prophylaxis for silicosis. Silicosis is a chronic lung disease caused by the inhalation of crystalline silica dust and was prevalent in the Canadian mining industry during this time period. The McIntyre Research Foundation developed, patented, and produced the MP and distributed it to licensees in Canada, the United States, Mexico, Chile, Belgian Congo, and Western Australia. In the province of Ontario, Canada it is estimated that at least 27,500 miners between 1943 and 1979 were exposed to MP. The present study was undertaken to examine the chemical and physical characteristics of two variations of MP (light grey and black). Chemical analyses (using X-ray Fluorescence and Inductively Coupled Plasma approaches) indicate that the black MP contains significantly higher concentrations of aluminum and metal impurities than the light grey MP (p < 0.001). X-ray diffractometry shows that while aluminum hydroxide dominates the aluminum speciation in both variations, the higher total aluminum content in the black MP is attributable to a greater proportion of elemental aluminum. Physical characterization (using electron microscopy, light microscopy, and dynamic light scattering) indicates that the light grey MP consists of particles ranging from 5 nm to 5 µm in diameter. Atomic Force Microscopy shows that the light grey MP particles in the nanoparticle range (<100 nm) have a mode between 5 and 10 nm. Consequently, it is possible that inhaled smaller MP nanoparticles may be transported via blood and lymph fluid circulation to many different organs including the brain. It is also possible for inhaled larger MP particles to deposit onto lung tissue and for potential health effects to arise from inflammatory responses through immune activation. This MP characterization will provide crucial data to help inform future toxicological, epidemiological, and biological studies of any long-term effects related to the inhalation of aluminum dust and nanomaterials. pubtype: Academic Journal doctype: pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
|---|