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| Titel |
Study of spatiotemporal variation of atmospheric mercury and its human exposure around an integrated steel plant, India |
| VerfasserIn |
S. Pervez, A. Koshle, Y. Pervez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 12 ; Nr. 10, no. 12 (2010-06-22), S.5535-5549 |
| Datensatznummer |
250008568
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| Publikation (Nr.) |
 copernicus.org/acp-10-5535-2010.pdf |
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| Zusammenfassung |
| Mercury release by coal combustion has been significantly increased in
India. Mercury content in coal has been analyzed to 0.272 ppm by Central
Pollution Control Board. Toxicological effects of elemental Hg (Hg0)
exposure include respiratory and renal failures, cardiac arrest, and
cerebral oedema, while subclinical exposure may induce kidney, behavioral,
and cognitive dysfunctions. The present work is focused on dispersion
pattern and inter-phase exchange phenomena of ambient mercury between
air-particulate matter evaluations of alongwith dominance of various major
routes of human exposure-dose response using regression analysis around an
integrated steel plant in central India. Source-downwind type stratified
random sampling plan using longitudinal study design has been adopted for
ambient monitoring of total mercury, while representative sampling plant has
been adopted for persona exposure-dose response study In space-time
framework. Control sites and subjects have been chosen from uncontaminated
area (100 km away from any industrial activities). 06 ambient air monitoring
stations and 17 subjects from workers, non-workers but local residents'
categories and from controlled sites have been chosen for the study. Samples
of mercury biomarkers (blood, breast milk and urine) have also been
collected from same subjects in each month during sampling period. The
sampling period was March 2005 to February 2006 . Samples of 30%
acidified KMnO4 for air-Hg absorption, PM10, RPM and biological
samples were analyzed for total mercury by ICP-AES using standard methods.
Local soils and ground water were also monitored for total mercury content
during the sampling period. Results have shown that mercury concentration is
very high compared to prescribed limits in all receptors. Results of
exchange phenomenon have shown the higher transfer of mercury from air to
particulate during combustion in steel plant environment due to presence of
huge amount of iron particles, in contrast to results obtained in other
industrial locations earlier. Plant workers have shown 1.5 to 2.5 times
higher personal RPM-Hg levels compared to Category 2 and 20–30 times higher
than Category 3. All biomarkers have shown higher Hg presence compared to
prescribed standards. Regression analysis between exposure routes and
bio-receptors has been investigated. Dominance status of selected routes of
bio-accumulation has been varied from category to category. |
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