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| A comparative study on the elements of PM2.5 in two sampling methods of steel dust |
| ZHANG Lei1,2, JI Ya-qin1,2, LI Yue-yang1,2, ZHAO Jing-qi1,2, WANG Shi-bao1,2 |
1. College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China;
2. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin 300350, China |
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Abstract Samples of seven sampling points of download ash and flue fly ash were collected by the system random sampling method and dilution channel sampling method,respectively.The elements were detected by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma atomic emission spectrometry (ICP-OES), using coefficient of divergence, two related samples nonparametric test (Wilcoxon) and curve fitting for a comparative study of elemental characteristics and content. The results showed that the contents of Fe, Ca, Si, Mg, Al, K, Ti, Na and Ba were higher in the samples collected by the two methods; Through the comparison of the elements by the two sampling methods in this study and other cities, it is proved the overall trend of the elements is the same, but there is a big difference in the content. The results of coefficient of divergence showed that the overall elemental characteristics of the two sampling methods must not be similar; tworelated samples nonparametric test and curve fitting of samples showed significant differences in the contents of other elements except Cr, Cs, Cu, and Tl, by analyzing elements with significant differences through curve fitting, correlation between the components of the two sampling methods can be obtained.
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Received: 23 April 2018
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