Determination of total nitrogen in atmospheric wet and dry deposition samples

Karthikeyan, Sathrugnan; He, Jun; Palani, Sundarambal; Balasubramanian, Rajasekhar; Burger, David F.

doi:10.1016/j.talanta.2008.07.053

Cited by 40 publications

(21 citation statements)

References 27 publications

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“…8) similarly showed the changes in the concentration of N and P species in seawater. The observation of P enrichment due to atmospheric deposition in the present study is in contrast to other studies (Krishnamurthy et al, 2007(Krishnamurthy et al, , 2010Zamora et al, 2010). In present modeling study, the impact of both organic N (Fig.…”

Section: Significance Of Atmospheric Deposition During Smoke Haze Evecontrasting

confidence: 99%

“…The various chemical forms of nutrients (N and P species) from atmospheric deposition were quantified by analyzing the collected atmospheric (both dry and wet) deposition samples using validated laboratory techniques (APHA, 2005;Sundarambal et al, 2006Sundarambal et al, , 2009Karthikeyan et al, 2009;Sundarambal et al, 2010b).…”

Section: Datamentioning

confidence: 99%

“…The coastal and oceanic primary production due to atmospherically transported N and other nutrient sources may be promoting the major biological changes that are now apparent in coastal and oceanic waters, including the proliferation of harmful algal blooms (HAB) and decline in water quality and fish stock (Jickells, 1998). The modeling study of Krishnamurthy et al (2007Krishnamurthy et al ( , 2009Krishnamurthy et al ( , 2010 and Zamora et al (2010) investigated the effects of nutrient deposition on surface biogeochemistry. Regionally atmospheric N inputs can have significant impacts on marine biogeochemistry, potentially supporting >25% of the export production, an impact that is increasing due to human activities (Krishnamurthy et al, 2010).…”

Section: Environmental Impactsmentioning

confidence: 99%

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Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

2010

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Abstract. Atmospheric deposition of nutrients (N and P species) can intensify anthropogenic eutrophication of coastal waters. It was found that the atmospheric wet and dry depositions of nutrients was remarkable in the Southeast Asian region during the course of smoke haze events, as discussed in a companion paper on field observations (Sundarambal et al., 2010b). The importance of atmospheric deposition of nutrients in terms of their biological responses in the coastal waters of the Singapore region was investigated during hazy days in relation to non-hazy days. The influence of atmospherically-derived, bio-available nutrients (both inorganic and organic nitrogen and phosphorus species) on the coastal water quality between hazy and non-hazy days was studied. A numerical modeling approach was employed to provide qualitative and quantitative understanding of the relative importance of atmospheric and ocean nutrient fluxes in this region. A 3-D eutrophication model, NEUTRO, was used with enhanced features to simulate the spatial distribution and temporal variations of nutrients, plankton and dissolved oxygen due to atmospheric nutrient loadings. The percentage increase of the concentration of coastal water nutrients relative to the baseline due to atmospheric deposition was estimated between hazy and non-hazy days. Model computations showed that atmospheric deposition fluxes of nutrients might account for up to 17 to 88% and 4 to 24% of total mass of nitrite + nitrate-nitrogen in the water column, during hazy days and non-hazy days, respectively. The results obtained from the modeling study could be used for a Correspondence to: R. Balasubramanian (eserbala@nus.edu) better understanding of the energy flow in the coastal zone system, exploring various possible scenarios concerning the atmospheric deposition of nutrients onto the coastal zone and studying their impacts on water quality.

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Section: Significance Of Atmospheric Deposition During Smoke Haze Evecontrasting

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Environmental Impactsmentioning

confidence: 99%

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Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

2010

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“…[13][14][15][16][17] Nevertheless, there is a need to find effective and fast preconcentration techniques for increasing the sensitivity of detection because it is often difficult to detect low level inorganic anions in the presence of a large excess of foreign ions directly by spectrophotometric and conductivity measurements.…”

Section: Introductionmentioning

confidence: 99%

Partition/Ion-Exclusion Chromatographic Ion Stacking for the Analysis of Trace Anions in Water and Salt Samples by Ion Chromatography

et al. 2018

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A new analytical methodology for a simple and efficient on-line preconcentration of trace inorganic anions in water and salt samples prior to ion chromatographic determination is proposed. The preconcentration method is based on partition/ ion-exclusion chromatographic ion stacking (PIEC ion stacking) with a hydrophilic polymer gel column containing a small amount of fixed anionic charges. The developed on-line PIEC ion stacking-ion chromatography method was validated by recovery experiments for the determination of nitrate in tap water in terms of both accuracy and precision, and the results showed the reliability of the method. The method proposed was also successfully applied to the determination of trace impurity nitrite and nitrate in reagent-grade salts of sodium sulfate. A low background level can be achieved since pure water is used as the eluant for the PIEC ion stacking. It is possible to reach sensitive detection at sub-μg L -1 levels by on-line PIEC ion stacking-ion chromatography.

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“…However, the use of rainwater for drinking purposes is impeded by issues of water quality in terms of chemical and microbiological contamination and its potential health risks (1). While numerous studies on the chemical contamination of rainwater have been conducted (5,11,27,30,43), its microbial quality remains relatively unknown due to the analytical challenge involved in the detection of a range of contaminants, particularly pathogens.Some previous studies have reported that roof-harvested rainwater is generally acceptable for drinking and household purposes (12,13,16,26), while more-recent studies have revealed the presence of waterborne pathogens in rainwater samples (1,3,11,22,34,35,43). Differences in the characteristics of the catchment area, the type of water tanks, their cleanliness, and other factors, such as roof material, the intensity of human activities in the catchment area (urban or rural), and the presence of insects and birds on the rooftop, could be responsible for the contradictory results in the literature on the microbial quality of rainwater (10,17,18,34,39,46).…”

mentioning

confidence: 99%

Influence of Air Quality on the Composition of Microbial Pathogens in Fresh Rainwater

Kaushik

Balasubramanian

Cruz

2012

Appl Environ Microbiol

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In this study, the microbiological quality of fresh rainwater was assessed from 50 rain events under tropical weather conditions for a year. The levels of four major opportunistic waterborne pathogens, namely, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Aeromonas hydrophila, in rainwater samples were quantified by using a robust and sensitive quantitative PCR (qPCR) method. Of the 50 rainwater samples, 25 were found to be positive for at least one pathogen: 21 for E. coli, 16 for P. aeruginosa, 6 for K. pneumoniae, and 1 for A. hydrophila. In addition to the microbiological assessment of rainwater samples, we also studied the influence of prevailing air quality on the microbial quality of rainwater over the sampling period. A significant change in the diversity and relative abundance of the basic microbial indicator organisms in rainwater was observed during a major regional air pollution episode in Southeast Asia due to biomass-burning emissions. Water shortage is becoming a major problem worldwide due to the increased demands of growing population and urbanization (29,38). In an effort to ensure a sustainable future, a global search for alternative sources of water is ongoing, and rainwater harvesting has received considerable attention (1,13,23,44,45). However, the use of rainwater for drinking purposes is impeded by issues of water quality in terms of chemical and microbiological contamination and its potential health risks (1). While numerous studies on the chemical contamination of rainwater have been conducted (5,11,27,30,43), its microbial quality remains relatively unknown due to the analytical challenge involved in the detection of a range of contaminants, particularly pathogens.Some previous studies have reported that roof-harvested rainwater is generally acceptable for drinking and household purposes (12,13,16,26), while more-recent studies have revealed the presence of waterborne pathogens in rainwater samples (1,3,11,22,34,35,43). Differences in the characteristics of the catchment area, the type of water tanks, their cleanliness, and other factors, such as roof material, the intensity of human activities in the catchment area (urban or rural), and the presence of insects and birds on the rooftop, could be responsible for the contradictory results in the literature on the microbial quality of rainwater (10,17,18,34,39,46). Numerous studies conducted on the chemical composition of rainwater and roof runoff have demonstrated links between chemical contaminants and weather patterns, and between atmospheric transport and deposition (9,19,24,48). However, little is known about such links with respect to microbial composition. In order to identify sources of microorganisms in roof-harvested rainwater, it is desirable to study the microbial flora of fresh rainwater prior to its collection and storage, with no contamination from external sources.Microbial water quality monitoring is generally directed toward indicator microorganisms such as coliforms, Escherichia coli, and Klebsiel...

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Determination of total nitrogen in atmospheric wet and dry deposition samples

Cited by 40 publications

References 27 publications

Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

Partition/Ion-Exclusion Chromatographic Ion Stacking for the Analysis of Trace Anions in Water and Salt Samples by Ion Chromatography

Influence of Air Quality on the Composition of Microbial Pathogens in Fresh Rainwater

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