Exploration of detection methods for free silica with different crystal forms in dust
10.3760/cma.j.cn121094-20230302-00058
- VernacularTitle:粉尘中不同晶型游离二氧化硅检测方法的探讨
- Author:
Qi GENG
1
;
Chaoyang WANG
;
Chengming MENG
;
Zixin HE
;
Liu YANG
;
Yudan ZHANG
Author Information
1. 河南省第三人民医院（河南省职业病医院）职业与环境检测检验中心，河南省化学毒物检测医学重点实验室,郑州 450052
- Keywords:
Dust;
Crystal form;
Free silica;
X-ray diffraction;
Pyrophosphate method;
Spectrophotometry, infrared
- From:
Chinese Journal of Industrial Hygiene and Occupational Diseases
2024;42(3):180-183
- CountryChina
- Language:Chinese
-
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, β, 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 β, 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 β, γ and α, γ mixed crystalline free silica.
