Articles online

Effect of the Quartz Particle Size on XRD Quantifications and Its Implications for Field Collected Samples

Category: Articles

Volume: 14 | Issue: 6 | Pages: 1573-1583
DOI: 10.4209/aaqr.2013.04.0119
PDF | RIS | BibTeX

Ching-Hwa Chen1, Jhy-Charm Soo2, Li-Hao Young2, Trong-Nen Wu2, Chungsik Yoon3, Chane-Yu Lai4, Perng-Jy Tsai 1,2

  • 1 Department of Environmental and Occupational Health, Medical College, National Cheng Kung University, 138, Sheng-Li Rd., Tainan 70428, Taiwan
  • 2 Department of Occupational Safety and Health, College of Public Health, China Medical University and Hospital, 91, Hsueh-Shih Rd, Taichung 40402, Taiwan
  • 3 Institute of Health and Environment, School of Public Health, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea
  • 4 Department of Occupational Medicine, Chung Shan Medical University Hospital, 110, Sec.1, Jianguo N. Rd.,Taichung City 40201, Taiwan


The aims of the present study were to assess the effect of the quartz particle size on XRD quantifications, and use it to develop models for correcting the measured quartz concentrations of samples collected from the field. Seven nearly mono-dispersed pure quartz dusts, with mass median aerodynamic diameters (MMAD) ranging from 0.70 to 10.84 µm, were prepared by a liquid sedimentation device, and their unit XRD intensities (UI) were measured using the NIOSH Method 7500. The results show that UI increases (from 063 to 1.14) along with the rise in MMAD of the pure quartz dust. To examine the impact of the above results on quantifying field collected samples, both total dust and respirable dust samplings were conducted at seven different workplace environments. The results show that the quartz particles contained in all collected total dust samples (MMAD = 5.18–16.7 µm, GSD = 2.08–2.88) were coarser in their particle sizes than that of the reference quartz standard (NIST-SRM 1878; MMAD = 2.16 µm, GSD = 1.55), and the measured total quartz particle concentrations (Cm) were 16.6–22.5% lower than the corresponding true concentrations (Ct). However, for respirable dust samples (MMAD = 1.37–3.95 µm, GSD = 1.978–2.87), since collected quartz particle sizes could be either finer or coarser than that of the reference standard, both underestimation and overestimation were found in the present study (Cm/Ct = 0.881–1.09). To correct the measured concentrations of field collected samples, correcting models were developed based on the MMADs of the collected quartz particle samples and their corresponding UIs. This study yields correcting factors for the respirable fraction (CRf) as CRf = 1.50 – 0.67 × [1 – exp(–0.69 × MMAD)] (R2 = 0.996, n = 7). However, the obtained CRf should be used with caution if the collected samples were found with quartz particle sizes falling outside the size range of the present study.


Quartz Particle size distribution X-ray diffraction Exposure assessment

Related Article

Coarse-Particle Passive-Sampler Measurements and Single-Particle Analysis by Transmitted Light Microscopy at Highly Frequented Motorways

Zhaoxue Tian, Volker Dietze, Frank Sommer, Anja Baum, Uwe Kaminski, Jan Sauer, Christoph Maschowski, Peter Stille, Kuang Cen, Reto Gieré
Volume: 17 | Issue: 8 | Pages: 1939-1953
DOI: 10.4209/aaqr.2017.02.0064

An Overview: Polycyclic Aromatic Hydrocarbon Emissions from the Stationary and Mobile Sources and in the Ambient Air

Nicholas Kiprotich Cheruiyot, Wen-Jhy Lee , John Kennedy Mwangi , Lin-Chi Wang, Neng-Huei Lin, Yuan-Chung Lin, Junji Cao, Renjian Zhang, Guo-Ping Chang-Chien
Volume: 15 | Issue: 7 | Pages: 2730-2762
DOI: 10.4209/aaqr.2015.11.0627

Critical Emissions from the Largest On-Road Transport Network in South Asia

Saroj Kumar Sahu , Gufran Beig, Neha Parkhi
Volume: 14 | Issue: 1 | Pages: 135-144
DOI: 10.4209/aaqr.2013.04.0137

Ambient Air Quality during Diwali Festival over Kolkata – A Mega-City in India

A. Chatterjee , C. Sarkar, A. Adak, U. Mukherjee, S.K. Ghosh, S. Raha
Volume: 13 | Issue: 3 | Pages: 1133-1144
DOI: 10.4209/aaqr.2012.03.0062