[2] Winchester J W, Bi Mutian. Atmospheric Environment, 1984, 18: 1399.
[3] Frank Schaumann, Paul J A Borm, Andreas Herbrich, et al. American Journal of Respiratory and Critical Care Medicine, 2004, 170: 898.
[10] US EPA. Standard Operating Procedure for the Determination of Metals In Ambient Particulate Matter Analyzed By Inductively Coupled Plasma/Mass Spectrometry (ICP/MS), 2005.
[11] US EPA Method 6020A. Inductively Coupled Plasma-Mass Spectrometry, 2007.