Determining the sources of atmospheric particles in Shanghai, China, from magnetic and geochemical properties

Abstract The study describes an investigation into the sources of atmospheric particles collected at 11 sites across Shanghai, China, during one week in November 1998. Source ascription is based on mineral magnetic and geochemical properties, and a chemical mass balance (CMB) model. The CMB model shows that the main contributions to total suspended particles (TSPs) are products of coal combustion, with lesser contributions from construction sites, vehicle emissions, windblown soil and steel-making furnaces. The spatial variability of concentration-dependent magnetic parameters and heavy metal concentrations support the findings from the CMB model. In general, the variability of magnetic quotient parameters is lower than for concentration parameters. This suggests that there are relatively constant proportions of low coercivity ‘magnetite’ and high coercivity ‘haematite’ mineral phases in dust samples at all sites, with a dominance of superparamagnetic (SP) and multidomain (MD)+pseudo-single domain (PSD) ‘magnetite’ grains. MD+PSD grains are produced to a large extent by fossil-fuel combustion emissions, particularly from the main iron and steel manufacturing and power generation industrial complex. Linear multiple regression analyses show that some non-destructive and rapid magnetic measurements may be used to estimate the concentrations of common heavy metals in TSPs.

[1]  Andrew P. Morse,et al.  Magnetic Properties of Daily Sampled Total Suspended Particulates in Shanghai , 2000 .

[2]  J. Dearing,et al.  Mineral magnetic properties of acid gleyed soils under oak and Corsican Pine , 1995 .

[3]  Judith C. Chow,et al.  Chemical Mass Balance Source Apportionment of Lead in House Dust , 1998 .

[4]  J. Prospero,et al.  Magnetic differentiation of atmospheric dusts , 1985, Nature.

[5]  John A. Dearing,et al.  Association between the organic matter content and magnetic properties in street dust, Liverpool, UK , 1999 .

[6]  H. J. Williamson,et al.  Review of receptor model fundamentals , 1984 .

[7]  B. Maher Magnetic properties of some synthetic sub-micron magnetites , 1988 .

[8]  John A. Dearing,et al.  Frequency-dependent susceptibility measurements of environmental materials , 1996 .

[9]  A. Hunt The application of mineral magnetic methods to atmospheric aerosol discrimination , 1986 .

[10]  L. Hansen,et al.  Crystalline components of stack-collected, size-fractionated coal fly ash. , 1981, Environmental science & technology.

[11]  John A. Dearing,et al.  Secondary ferrimagnetic minerals in Welsh soils: a comparison of mineral magnetic detection methods and implications for mineral formation , 1997 .

[12]  William A. Morris,et al.  Preliminary comparisons between mutagenicity and magnetic susceptibility of respirable airborne particulate , 1995 .

[13]  F. Oldfield,et al.  Changing atmospheric fallout of magnetic particles recorded in recent ombrotrophic peat sections. , 1978, Science.

[14]  Roy Thompson,et al.  Quaternary Climates, Environments and Magnetism , 1999 .

[15]  Ronald E. Hester,et al.  Receptor modeling for air quality management , 1997 .

[16]  Xudong Huang,et al.  Emissions of trace elements from motor vehicles: Potential marker elements and source composition profile , 1994 .

[17]  J. King,et al.  A comparison of different magnetic methods for determining the relative grain size of magnetite in natural materials: Some results from lake sediments , 1982 .

[18]  Judith C. Chow,et al.  Chapter 4 - Chemical Mass Balance , 1991 .

[19]  David Williamson,et al.  Relationship between heavy metals and magnetic properties in a large polluted catchment: The Etang de Berre (south of France) , 1997 .

[20]  B. Maher,et al.  Magnetic biomonitoring of roadside tree leaves: identification of spatial and temporal variations in vehicle-derived particulates , 1999 .

[21]  M. Thompson,et al.  A handbook of inductively coupled plasma spectrometry , 1983 .

[22]  L D Hulett,et al.  Chemical species in fly ash from coal-burning power plants. , 1980, Science.

[23]  H. Pinjing,et al.  Road dust emission inventory for the metropolitan area of Shanghai City , 1993 .

[24]  J. B. Ellis,et al.  Heavy metal and magnetic relationships for urban source sediments , 1986 .

[25]  C. A. Evans,et al.  Characterizing the surfaces of environmental particles , 1978 .

[26]  P. Flanders Identifying fly ash at a distance from fossil fuel power stations , 1999 .

[27]  R. Thompson Modelling magnetization data using SIMPLEX , 1986 .

[28]  F. Oldfield,et al.  Lake Sediment Magnetism and Atmospheric Deposition , 1990 .

[29]  F. Oldfield,et al.  Magnetic measurements and heavy metals in atmospheric particulates of anthropogenic origin , 1984 .

[30]  J. Bloemendal,et al.  A partial susceptibility approach to analysing the magnetic properties of environmental materials: a case study , 1999 .

[31]  Frank Oldfield,et al.  Environmental magnetism — A personal perspective , 1991 .

[32]  S. Charlesworth,et al.  The use of mineral magnetic measurements in polluted urban lakes and deposited dusts, Coventry, U.K. , 1997 .

[33]  Martin Bates,et al.  Environmental magnetism: a practical guide: J. Walden, F. Oldfield, J. and Smith (Eds.); Technical Guide No. 6, Quaternary Research Association, London, 1999, 243 pp., price £17.00 (£9.00 to QRA members) ISBN 0-907780-42-3 , 2002 .

[34]  P. Preuss,et al.  Czech Air Quality Monitoring and Receptor Modeling Study , 1995 .

[35]  Judith C. Chow,et al.  The USEPA/DRI chemical mass balance receptor model, CMB 7.0 , 1990 .

[36]  John A. Dearing,et al.  A preliminary attempt to identify atmospherically-derived pollution particles in English topsoils from magnetic susceptibility measurements , 1997 .