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Lai CY, Chao HR, Tsai YI, Huang XY, Lin TH. Development and evaluation of a novel personal sampler for PM 1 using rotating porous media. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 682:709-718. [PMID: 31141753 DOI: 10.1016/j.scitotenv.2019.05.086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 04/18/2019] [Accepted: 05/07/2019] [Indexed: 06/09/2023]
Abstract
A rotating filtration device (RFD) that is filled with porous media is developed for sampling particulate matter with a diameter of 1 μm or less (PM1). An experiment is conducted on a test system using corn oil as a test aerosol. The RFD was evaluated using an aerodynamic particle sizer. The results yielded cutoff sizes of 1.68 μm and 1.04 μm at rotational speeds of 0 rpm and 9000 rpm, respectively, with foam with 80 pores per inch (ppi), a thickness of 80 mm, and a face velocity of 13.5 cm/s. When the foam was replaced with 94 ppi nickel mesh, the cutoff size decreased from 1.45 μm to 0.98 μm as the thickness increased from 17 to 68 mm. As the face velocity of the RFD increased from 13.5 to 108.3 cm/s, the cutoff size declined from 1.04 μm to 0.77 μm. Most of the changes in the cutoff sizes of the RFD were statistically significant (p < 0.05). The maximum pressure drops through the foam and the nickel mesh were 33.5 and 36.6 mm H2O, respectively. The experiment revealed that increasing the rotational speed and face velocity of the RFD, and the thickness and nominal size of the porous media reduced the penetration of oil aerosols.
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Affiliation(s)
- Chane-Yu Lai
- Department of Occupational Safety and Health, Chung Shan Medical University, Taiwan; Department of Occupational Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - How-Ran Chao
- Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan
| | - Ying I Tsai
- Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science, Tainan, Taiwan
| | - Xiang-Yu Huang
- Department of Occupational Safety and Health, Chung Shan Medical University, Taiwan
| | - Tzu-Hsien Lin
- Department of Public Health, China Medical University, Taichung, Taiwan; Department of Occupational Safety and Health, China Medical University, Taichung, Taiwan.
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Gupta T, Agarwal AK, Agarwal RA, Labhsetwar NK. Bioaerosols Over the Indo-Gangetic Plain: Influence of Biomass Burning Emission and Ambient Meteorology. ENVIRONMENTAL CONTAMINANTS 2017. [PMCID: PMC7123097 DOI: 10.1007/978-981-10-7332-8_5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Bioaerosols (particles of biological origin) can be produced from living or dead plants and animals. They can potentially serve as the cloud condensation and ice nuclei (CCN and IN). Their role in global carbon cycle further highlights importance of studying their variability to link up with climate relevance parameters. Focusing on tropical region reveals that it holds wealthy number of human population and has massive vegetation cover-area. From Indian region, production estimates of bioaerosols from human population (current: ~1.25 billion; of which over 45% resides in Indo-Gangetic Plain: IGP) and Wildlife Sanctuaries and National Parks (100 in numbers, situated from north to south and east to west) is not known. Most of the forest fires in India occur during March–June (hot and drier season). The detailed information on chemical composition, fingerprinting and radiative forcing from regional forest fires is also lacking. Unlike natural sources (forest cover and fires), the seasonal variability of pollutants emission characteristic and chemical, optical and radiative forcing are relatively well studied from anthropogenic biomass (post-harvest paddy- and wheat-residue and biofuels) burning emission in India. However, the abundance of bioaerosols and their variability over a large stretch of IGP (north-west to north-east) was not well documented. Towards this, we have undertaken a year-long campaign to study and document (first-attempt) bioaerosols variability over a complete annual cycle from central IGP. We observed a parallel enhancement in concentrations of fine-particulate matter (PM2.5 in October–November: 158 ± 89 µg m−3 as compared to June–September months: 40 ± 18 µg m−3; two-tailed t = 8.2, p < 0.05) and bioaerosols (particularly Gram-negative bacteria: GNB, a source of endotoxin in ambient air; 186 ± 87 CFU/m3 during October-November as compared to 114 ± 58 CFU/m3; t = 4.0, p < 0.05) with the biomass burning emissions intensification period. The abundance of bioaerosols exhibits influence of ambient meteorology, for example GNB exhibited negative correlations with T, wind speed and heavy (>4 mm daily) precipitation, whereas it showed positive correlations with RH and low precipitation amount (<4 mm). Studying bioaerosols and establishing its linkage to health and climate appear to be of utmost importance.
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Affiliation(s)
- Tarun Gupta
- Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh India
| | - Avinash Kumar Agarwal
- Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh India
| | - Rashmi Avinash Agarwal
- Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh India
| | - Nitin K. Labhsetwar
- Energy and Resource Management Division, CSIR-National Environmental Engineering Research Institute (NEERI), Nagpur, Maharashtra India
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Singh DK, Kawamura K, Yanase A, Barrie LA. Distributions of Polycyclic Aromatic Hydrocarbons, Aromatic Ketones, Carboxylic Acids, and Trace Metals in Arctic Aerosols: Long-Range Atmospheric Transport, Photochemical Degradation/Production at Polar Sunrise. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:8992-9004. [PMID: 28730822 DOI: 10.1021/acs.est.7b01644] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The distributions, correlations, and source apportionment of aromatic acids, aromatic ketones, polycyclic aromatic hydrocarbons (PAHs), and trace metals were studied in Canadian high Arctic aerosols. Nineteen PAHs including minor sulfur-containing heterocyclic PAH (dibenzothiophene) and major 6 carcinogenic PAHs were detected with a high proportion of fluoranthene followed by benzo[k]fluoranthene, pyrene, and chrysene. However, in the sunlit period of spring, their concentrations significantly declined likely due to photochemical decomposition. During the polar sunrise from mid-March to mid-April, benzo[a]pyrene to benzo[e]pyrene ratios significantly dropped, and the ratios diminished further from late April to May onward. These results suggest that PAHs transported over the Arctic are subjected to strong photochemical degradation at polar sunrise. Although aromatic ketones decreased in spring, concentrations of some aromatic acids such as benzoic and phthalic acids increased during the course of polar sunrise, suggesting that aromatic hydrocarbons are oxidized to result in aromatic acids. However, PAHs do not act as the major source for low molecular weight (LMW) diacids such as oxalic acid that are largely formed at polar sunrise in the arctic atmosphere because PAHs are 1 to 2 orders of magnitude less abundant than LMW diacids. Correlations of trace metals with organics, their sources, and the possible role of trace transition metals are explained.
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Affiliation(s)
| | - Kimitaka Kawamura
- Chubu Institute for Advanced Studies, Chubu University , Kasugai 487-8501, Japan
- Department of Chemistry, Tokyo Metropolitan University , Hachioji, Tokyo 192-0397, Japan
| | - Ayako Yanase
- Department of Chemistry, Tokyo Metropolitan University , Hachioji, Tokyo 192-0397, Japan
| | - Leonard A Barrie
- Bolin Centre Research, Stockholm University , Stockholm SE-106 91, Sweden
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Singh DK, Gupta T. Role of ammonium ion and transition metals in the formation of secondary organic aerosol and metallo-organic complex within fog processed ambient deliquescent submicron particles collected in central part of Indo-Gangetic Plain. CHEMOSPHERE 2017; 181:725-737. [PMID: 28478233 DOI: 10.1016/j.chemosphere.2017.04.080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 04/15/2017] [Accepted: 04/18/2017] [Indexed: 06/07/2023]
Abstract
In this study we observed the role of ammonium ion (NH4+) and transition metals (Fe, Mn, Cr, and Cu) present in ambient submicron particles in stabilizing and enhancing the yield of water soluble organic carbon (WSOC). A good correlation of WSOC with transition metals and NH4+ was found (R2 = 0.87 and 0.71), respectively within foggy episode collected ambient PM1 (particles having aerodynamic diameter ≤1.0 μm) suggesting plausibleness of alternate oxidation (primarily various carbonyls into their respective organic acids, esters and other derivatives.) and aging mechanisms. Molar concentration of ammonium ion was observed to be exceeded over and above to require in neutralizing the sulphate and nitrate which further hints its role in the neutralization, stabilization and enhancement of subset of WSOC such as water soluble organic acids. Transition metals were further apportioned using enrichment factor analysis. The source of Fe, Mn, and Cr was found to be crustal and Cu was tagged to anthropogenic origin. This study also described the plausible role of significant predictors (Fe and Cu) in the secondary organic aerosol (SOA) formation through effect of Fenton chemistry. Mass-to-charge ratio of identified oxalic acid from our published recent field study (carried out from same sampling location) was used for understanding the possible metallo-organic complex with Fe supports the substantial role of Fe in SOA formation in the deliquescent submicron particles facilitated by aqueous-phase chemistry.
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Affiliation(s)
- Dharmendra Kumar Singh
- Chubu Institute for Advanced Studies, Chubu University, Kasugai-shi, Aichi, 487-8501, Japan.
| | - Tarun Gupta
- Department of Civil Engineering, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, 208016, India.
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Chakraborty A, Gupta T, Tripathi SN. Combined effects of organic aerosol loading and fog processing on organic aerosols oxidation, composition, and evolution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 573:690-698. [PMID: 27589820 DOI: 10.1016/j.scitotenv.2016.08.156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Revised: 07/29/2016] [Accepted: 08/22/2016] [Indexed: 06/06/2023]
Abstract
Chemical characterization of ambient non-refractory submicron aerosols (NR-PM1) was carried out in real time at Kanpur, India. The measurements were performed during the winter (December 2014 to February 2015), and comprised of two very distinct high and low aerosol loading periods coupled with prevalent foggy conditions. The average non-refractory submicron aerosol loading varied significantly from high (HL, ~240μg/m3) to low loading (LL, ~100μg/m3) period and was dominated by organic aerosols (OA) which contributed more than half (~60%) of the measured aerosol mass. OA source apportionment via positive matrix factorization (PMF) showed drastic changes in the composition of OA from HL to LL period. Overall, O/C (oxygen to carbon) ratios also varied significantly from HL (=0.59) to LL (=0.69) period. Fog episodes (n=17) studied here seem to be reducing the magnitude of the negative impact of OA loading on O/C ratio (OA loading and O/C ratio are anti-correlated, as higher OA loading allows gas to particle partitioning of relatively less oxidized organics) by 60% via aqueous processing. This study provided new insights into the combined effects of OA loading and fog aqueous processing on the evolution of ambient organic aerosols (OA) for the first time.
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Affiliation(s)
| | - Tarun Gupta
- Department of Civil Engineering, Indian Institute of Technology, Kanpur, India; Centre of Environmental Science and Engineering, CESE, IIT, Kanpur, India.
| | - S N Tripathi
- Department of Civil Engineering, Indian Institute of Technology, Kanpur, India; Centre of Environmental Science and Engineering, CESE, IIT, Kanpur, India.
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Kumar B, Chakraborty A, Tripathi SN, Bhattu D. Highly time resolved chemical characterization of submicron organic aerosols at a polluted urban location. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2016; 18:1285-1296. [PMID: 27711757 DOI: 10.1039/c6em00392c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Non-refractory submicron (NR-PM1) aerosols were measured during the late winter period (February-March) via an Aerodyne High Resolution Time of Flight Aerosols Mass Spectrometer (HR-ToF-AMS) along with Black Carbon (BC) and trace gasses in an industrial city, Kanpur, situated in the Gangetic Plain (GP) of India. The composition of NR-PM1 aerosols was dominated by organics (54%), followed by inorganics (36%), and BC (10%). Source apportionment via Positive Matrix Factorization (PMF) of AMS measured organic aerosols (OAs) revealed 6 factors. Factors are identified as 2 types of oxidized organic aerosols (OOAs), 2 types of biomass burning organic aerosols (BBOAs), freshly emitted hydrocarbon-like organic aerosols (HOAs) and oxygenated primary organic aerosols (OPOAs). A substantial increase in relative OOA contributions (200%) and O/C ratio (26%) has been observed from the high loading events (HLE) to the low loading events (LLE). Back trajectory analysis indicated that the study location received contributions from regional and long-range transported aerosols. OA composition and evolution during this study period were also very different from those observed during a fog influenced peak winter period of December-January. This is the first study to present detailed aerosol composition during the late winter period in India highlighting the changes in OA composition and chemistry within the same winter season.
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Affiliation(s)
- Bharath Kumar
- Department of Civil Engineering, Indian Institute of Technology, Kanpur, India.
| | | | - S N Tripathi
- Department of Civil Engineering, Indian Institute of Technology, Kanpur, India. and Centre of Environmental Science and Engineering, CESE, IIT Kanpur, India
| | - Deepika Bhattu
- Department of Civil Engineering, Indian Institute of Technology, Kanpur, India.
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Singh DK, Gupta T. Source apportionment and risk assessment of PM1 bound trace metals collected during foggy and non-foggy episodes at a representative site in the Indo-Gangetic plain. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 550:80-94. [PMID: 26808399 DOI: 10.1016/j.scitotenv.2016.01.037] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 12/31/2015] [Accepted: 01/07/2016] [Indexed: 06/05/2023]
Abstract
The concentration, spatial distribution and source of 13-PM1 bound trace metals (Fe, Cu, Mn, Cr, Zn, Cd, Ni, K, Mg, Na, Ca, Pb and V) and adverse health effects of 5-PM1 bound trace metals (Mn, Zn, Ni, Cr and Cd) collected during foggy and non-foggy episodes are presented. Twenty-four samples from each period (foggy and non-foggy episodes) were collected from Kanpur, a typical densely populated city and the most polluted representative site in the Indo-Gangetic plain of India, and were analyzed for carcinogenic (Ni, Cr and Cd) and non-carcinogenic metals (Mn and Zn). The average mass concentration of PM1 during foggy and non-foggy episodes was found to be 160.16±37.70 and 132.87±27.97μg/m(3). Source identification via principle component analysis suggested that vehicular emission and anthropogenic, industrial and crustal dust were the dominant sources in this region. During both episodes the decreasing order of hazard quotient (Hq) for adult and children was as Mn>Cr>Cd>Ni>Zn. In a non-foggy episode the hazardous index (Hi) values of these 5 trace metals were found to be ~3.5 times higher than a foggy episode's exposed population, respectively. In a foggy episode, due to the exposure to total carcinogenic trace metals (Ni, Cr and Cd) present in the ambient air, 95% probability total incremental lifetime cancer risks (TIlcR) were ~687 cancer cases and ~402 cancer cases per million in the adult population and children population respectively. These cancer cases were ~1.6 times higher than a non-foggy episode's exposed population.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Civil Engineering & Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Tarun Gupta
- Department of Civil Engineering & Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India.
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Singh DK, Gupta T. Effect through inhalation on human health of PM1 bound polycyclic aromatic hydrocarbons collected from foggy days in northern part of India. JOURNAL OF HAZARDOUS MATERIALS 2016; 306:257-268. [PMID: 26844782 DOI: 10.1016/j.jhazmat.2015.11.049] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 11/06/2015] [Accepted: 11/24/2015] [Indexed: 06/05/2023]
Abstract
We investigated the health risk from 16 polycyclic aromatic hydrocarbons (PAHs) adsorbed on submicron particles and also reported their concentrations, spatial distribution and possible sources during foggy days at Kanpur. Twenty-four urban foggy day's samples gathered from Kanpur, an urban center in North India and most densely populated city in the Indo-Gangetic plain of India, were examined for 16 PAHs (2-6 rings).The mean concentration of PM1 was found to be 160.16±37.70μg/m(3). ∑16PAHs concentrations were 529.17ng/m(3) with a mean of 33.07ng/m(3). The compounds of higher molecular weight (4-6 rings) added to 70.67% of ∑PAHs mass concentration in the foggy day's samples. The results of source identification by using principle component analysis (PCA) and diagnostic ratios proposed that the primary sources of PAHs were vehicular emission (primarily driven by diesel fuel) and coal combustion and the secondary source. Exposure to total PAHs in the ambient air resulted in, 95% probability total Incremental Lifetime Cancer Risk (TILCR) 3.57×10(-5) for adults and 2.08×10(-5) for children or (∼35 cancer case per million in adults and ∼20 cancer case per million in children) due to inhalation in terms of ILCR were higher than the baseline value of acceptable risk (one cancer case per million people) suggesting moderate health risk to resident human population.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Civil Engineering and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Tarun Gupta
- Department of Civil Engineering and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India.
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