[Exploration of detection methods for free silica with different crystal forms in dust].
Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi
; 42(3): 180-183, 2024 Mar 20.
Article
in Zh
| MEDLINE
| ID: mdl-38538236
ABSTRACT
Objective:
To investigate the differences and applicability of free silica detection methods of different crystal forms in dust, and to provide a basis for the selection of various methods.Methods:
From December 2021 to June 2022, dust samples from 20 enterprises in different industries in 18 cities in Henan Province were randomly selected as the investigation objects. X-ray diffraction (XRD) method was used to analyze the samples and classify the samples. Based on GBZ/T 192.4-2007 "Determination of Dust in the Air of Workplace-Part 4 Content of Free Silica in Dust", pyrophosphate method and infrared spectrophotometry were used for quantitative determination. The measured results were analyzed by paired sample t test to evaluate the advantages and disadvantages of the two methods and their applicable scope.Results:
The XRD results of 20 dust samples could be divided into α, ß, γ crystal types and the mixed type of α and γ. There was no significant difference between pyrophosphate method and infrared spectrophotometry (P=0.180). The pyrophosphate method results of ß, γ and α, γ mixed crystalline free silica were significantly higher than those of infrared spectrophotometry, and the difference was statistically significant (P<0.001) .Conclusion:
Pyrophosphate method and infrared spectrophotometry are suitable for α-type free silica, while pyrophosphate method is suitable for ß, γ and α, γ mixed crystalline free silica.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Occupational Exposure
/
Air Pollutants, Occupational
Language:
Zh
Journal:
Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi
Journal subject:
MEDICINA OCUPACIONAL
Year:
2024
Document type:
Article
Affiliation country: