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Determination and analysis of silica particles surface alumino-silicate occlusion.

Authors

Wallace-WE; Chen-JQ; Wang-HJ; Chen-WH

Source

Chin J Ind Hyg Occup Dis 2006 Sep; 24(9):537-539

Link

 

NIOSHTIC No.

20031104 

Abstract

To investigate the methods of determining aluminum silicate coated on the surface of silica particles and analyze the role of surface occlusion on development of silicosis. Respirable dust samples were collected on filters using 2 L/min flow in tungsten mines and pottery factories of Jiangxi province, and tin mines of Guanxi province. Dust particles were analyzed by a multiple-voltage scanning electron microscopy-energy dispersive X-ray spectroscopy (MVSEM-EDS) using 20 KeV and 5 KeV electron beam accelerating voltages. Changes in the silicon to aluminum X-ray line intensity ratio between the two voltages are compared particle by particle. This provided an index that distinguishes a silica particle that was homogeneously aluminum-contaminated from a clay coated silica particle. The total of 3,982 dust particles from 47 dust samples of seven pottery factories, three tin mines and three tungsten mines were analyzed in this study. Significant difference of aluminum silicate coated on the surface of silica particle was shown between particles from pottery factories and tin mines. The average sample percentage of respirbale-sized silica particles alumino-silicate occlusion in the pottery factories (45%) was higher than that in the tin mines (18%) and tungsten mines (13%). Higher percentages silica particles alumino-silicate occlusion is observed in the pottery factories than that in metal mines. These surface analysis results help to understand differences in risk of silicosis when exposure is normalized to cumulative respirable surface silica dust.

Keywords

Industrial-hygiene; Occupational-diseases; Diseases; Silica-dusts; Silicates; Silicosis; Dusts; Dust-particles; Aluminum-compounds; Respirable-dust; Dust-sampling; Mining-industry; Occupational-exposure; Occupational-health

CODEN

ZLWZEX

CAS No.

7429-90-5

Publication Date

20060901

Document Type

Journal Article

Email Address

wchen@mails.tjmu.edu.cn

Fiscal Year

2006

NTIS Accession No.

NTIS Price

Issue of Publication

9

ISSN

1001-9391

NIOSH Division

HELD

Source Name

Chinese Journal of Industrial Hygiene and Occupational Diseases

State

WV