Chemical fractionation of arsenic and heavy metals in fine particle matter and its implications for risk assessment: A case study in Nanjing, China

Abstract A four-step sequential extraction procedure was used to study the chemical fractionation of As and heavy metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) in fine particulate matter (PM2.5) collected from Nanjing, China. The mass concentrations of most PM2.5 samples exceeded the 24 h standard (75 μg/m3) recommended by the new national ambient air quality standard of China. The most abundant elements were Fe, Zn and Pb, while As and Cd were present at the lowest concentrations. As, Cd, Cu, Mn, Pb and Zn were mostly present in the two mobile fractions, including the soluble and exchangeable fraction (F1), and carbonates, oxides and reducible fraction (F2). Fe had the highest proportion present in the residual fraction (F4). Relatively high proportions of the metals Ni and Cr were present in the oxidizable and sulfidic fraction (F3). High proportions of Zn, As and Cu and lower proportions of Cd, Cr and Fe were present in the potentially mobile phases. The enrichment factor, contamination factor and risk assessment code were calculated to analyze the main sources and assess the environmental risks of the metals in PM2.5. The carcinogenic risks of As, Cd, Ni and Pb were all lower than the accepted criterion of 10−6, whereas the carcinogenic risks of Cr for children and As and Cr for adults were higher than 10−6. The non-carcinogenic health risk of As and heavy metals because of PM2.5 exposure for children and adults were lower than but close to the safe level of 1.

[1]  Jérôme Rose,et al.  Zinc speciation in steel plant atmospheric emissions: A multi-technical approach , 2006 .

[2]  M. Yli-Halla,et al.  Use of sequential extraction to assess metal partitioning in soils. , 2003, Environmental pollution.

[3]  P. A. Azeez,et al.  Heavy Metals in Airborne Particulate Matter of Urban Coimbatore , 2004, Archives of environmental contamination and toxicology.

[4]  Hui-ming Li,et al.  Chemical speciation and human health risk of trace metals in urban street dusts from a metropolitan city, Nanjing, SE China. , 2013, The Science of the total environment.

[5]  K. Murphy,et al.  A three stage sequential leaching scheme for the characterisation of the sources and environmental mobility of trace metals in the marine aerosol , 1989 .

[6]  Mar Viana,et al.  Speciation and sources of atmospheric aerosols in a highly industrialised emerging mega-city in central China. , 2006, Journal of environmental monitoring : JEM.

[7]  G. Zeng,et al.  Total concentrations and chemical speciation of heavy metals in liquefaction residues of sewage sludge. , 2011, Bioresource technology.

[8]  J. Sáez,et al.  Comparative study of six different sludges by sequential speciation of heavy metals. , 2008, Bioresource technology.

[9]  Jing-chun Duan,et al.  Atmospheric heavy metals and Arsenic in China: Situation, sources and control policies , 2013 .

[10]  Judith C Chow,et al.  PM2.5 chemical composition in Hong Kong: urban and regional variations. , 2005, The Science of the total environment.

[11]  Yong-liang Ma,et al.  [Characteristics and sources of trace elements in ambient PM2.5 in Beijing]. , 2003, Huan jing ke xue= Huanjing kexue.

[12]  H. Frey,et al.  Assessment of inter-individual, geographic, and seasonal variability in estimated human exposure to fine particles. , 2012, Environmental science & technology.

[13]  T. Kazi,et al.  Speciation of heavy metals in untreated domestic wastewater sludge by time saving BCR sequential extraction method , 2007, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[14]  V. Cala,et al.  Short-term effects of biosolid and municipal solid waste applications on heavy metals distribution in a degraded soil under a semi-arid environment. , 2000, The Science of the total environment.

[15]  Beyhan Pekey,et al.  Fine particulate matter in the indoor air of barbeque restaurants: elemental compositions, sources and health risks. , 2013, The Science of the total environment.

[16]  M. Ternero-Rodríguez,et al.  Study of traffic pollution by metals in Seville (Spain) by physical and chemical speciation methods , 2004, Analytical and bioanalytical chemistry.

[17]  A. Espinosa,et al.  A chemical speciation of trace metals for fine urban particles , 2002 .

[18]  Vladimir J. Zatka,et al.  Chemical speciation of nickel in airborne dusts: analytical method and results of an interlaboratory test program , 1992 .

[19]  Ş. Kartal,et al.  Multivariate analysis of the data and speciation of heavy metals in street dust samples from the Organized Industrial District in Kayseri (Turkey) , 2006 .

[20]  J. Sáez,et al.  Simple and sequential extractions of heavy metals from different sewage sludges. , 2004, Chemosphere.

[21]  S. Srinivasalu,et al.  Assessment of acid leachable trace metals in sediment cores from River Uppanar, Cuddalore, Southeast coast of India. , 2006, Environmental pollution.

[22]  K. Loska,et al.  Application of Enrichment Factor to Assessment of Zinc Enrichment/Depletion in Farming Soils , 2005 .

[23]  Yan Wang,et al.  Temporal and spatial variation characteristics of atmospheric emissions of Cd, Cr, and Pb from coal in China , 2012 .

[24]  Ying Wang,et al.  Chemical characteristics of PM2.5 and PM10 in haze-fog episodes in Beijing. , 2006, Environmental science & technology.

[25]  A. Tessier,et al.  Sequential extraction procedure for the speciation of particulate trace metals , 1979 .

[26]  Shelly L. Miller,et al.  Positive matrix factorization of PM(2.5): comparison and implications of using different speciation data sets. , 2012, Environmental science & technology.

[27]  Hui-ming Li,et al.  Heavy metals in atmospheric particulate matter: a comprehensive understanding is needed for monitoring and risk mitigation. , 2013, Environmental science & technology.

[28]  L. Dawidowski,et al.  FRACTIONATION OF METALS AND METALLOIDS BY CHEMICAL BONDING FROM PARTICLES ACCUMULATED BY ELECTROSTATIC PRECIPITATION IN AN ARGENTINE THERMAL POWER PLANT , 2007 .

[29]  Herbert Muntau,et al.  Speciation of Heavy Metals in Soils and Sediments. An Account of the Improvement and Harmonization of Extraction Techniques Undertaken Under the Auspices of the BCR of the Commission of the European Communities , 1993 .

[30]  Jichun Wu,et al.  Fractionation and health risks of atmospheric particle-bound As and heavy metals in summer and winter. , 2014, The Science of the total environment.

[31]  J. A. Baig,et al.  Time saving modified BCR sequential extraction procedure for the fraction of Cd, Cr, Cu, Ni, Pb and Zn in sediment samples of polluted lake. , 2008, Journal of hazardous materials.

[32]  C. Yang,et al.  Chemical speciation of fine particle bound trace metals , 2009 .

[33]  Stefan Norra,et al.  Temporal variability of trace metal mobility of urban particulate matter from Beijing – A contribution to health impact assessments of aerosols , 2011 .

[34]  J. Hao,et al.  Trend and characteristics of atmospheric emissions of Hg, As, and Se from coal combustion in China, 1980–2007 , 2010 .

[35]  G. Pérez,et al.  Assessment of heavy metals remobilization by fractionation: comparison of leaching tests applied to roadside sediments. , 2008, Environmental science & technology.

[36]  Jichun Wu,et al.  Bioaccessibility and health risk of arsenic and heavy metals (Cd, Co, Cr, Cu, Ni, Pb, Zn and Mn) in TSP and PM2.5 in Nanjing, China , 2012 .

[37]  A. Hursthouse,et al.  FRACTIONATION OF POTENTIALLY TOXIC ELEMENTS IN URBAN SOILS FROM FIVE EUROPEAN CITIES BY MEANS OF A HARMONISED SEQUENTIAL EXTRACTION PROCEDURE , 2006 .