Elemental and stable isotope records of organic matter input and its fate in the Pichavaram mangrove–estuarine sediments (Tamil Nadu, India)

Ranjan, Rajesh Kumar; Routh, Joyanto; Ramanathan, Arvind; Klump, J. Val

doi:10.1016/j.marchem.2011.05.005

Cited by 73 publications

(36 citation statements)

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“…Consistent with this, the Pichavaram mangrove sediments with high silt+clay content and elevated %OC (Ranjan et al, 2010) correlated with high PAH concentrations (r 2 = 0.53). The Pichavaram mangrove sediments are anoxic (Ranjan et al, 2011), and they are protected from the direct impact of tidal waves compared to both estuarine sites (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

“…The elevated flux of ΣHMW PAHs in mangrove sediments might be explained in two ways. Firstly, organic matter in mangrove sediments was mainly derived from higher terrestrial sources (mainly in situ mangrove vegetation) or riverine material (Ranjan et al, 2011). During sediment transport, LMW PAHs degraded easily due to solubilization and volatilization processes (Christensen and Arora, 2007;Tian et al, 2008a;Okere and Semple, 2012) raising the concentration of HMW PAHs.…”

Section: Resultsmentioning

confidence: 99%

“…The PAH fluxes in these cores were low in the early nineteenth century and then, displayed a synchronous increase in the last four decades (i.e., after 1970; Figs. 2 and 5) irrespective of their location or variable sedimentation rates (Ranjan et al, 2011). This change was largely due to the socio-economic development in this region, which displayed dramatically increased agriculture and industrial activities in the upstream areas of the Cauvery River basin (Ramesh et al, 1990;Sarkar et al, 2005).…”

mentioning

confidence: 93%

“…The impact of urban development in the region can be traced by relating the sediment age and sedimentation rate (Ranjan et al, 2011) with PAH fluxes. The PAH fluxes in these cores were low in the early nineteenth century and then, displayed a synchronous increase in the last four decades (i.e., after 1970; Figs.…”

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confidence: 99%

“…Likewise, in the coastal areas, increase in motorboats and fishing trawler traffic, logging, combustion, and aquaculture activities added to the pool of various inorganic and organic contaminants (Alongi et al, 2005;Venkatachalapathya et al, 2012). In particular, increase in use of fossil fuels, lignite/coal, and biomass combustion have added to the pool of various organic pollutants (including PAHs) and trace metals accumulating in these sediments (Mukherjee and Nelliyat, 2007;Ranjan et al, 2011, MoPNG, 2011. The impact of human activities on the accumulation of toxic contaminants in other mangroves has been well documented by several researchers (Tam et al, 2001;Zhang et al, 2004;Zuloaga et al, 2009).…”

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confidence: 99%

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Polycyclic aromatic hydrocarbon fingerprints in the Pichavaram mangrove–estuarine sediments, southeastern India

Ranjan

Routh

Ramanathan

et al. 2012

Organic Geochemistry

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The sources and historical deposition of 16 polycyclic aromatic hydrocarbons (PAHs) were investigated in dated sediment cores from the Pichavaram mangrove-estuarine complex. The ΣPAH flux in mangrove and estuarine sediments are 0.064 ± 0.031 μg/cm 2 /yr and 0.043 ± 0.020 μg/cm 2 /yr, respectively. The PAH flux in sediments increases up-core coinciding with rapid urbanization since the 1970s. The flux shows a decrease in recent years (since 1990) coinciding with less riverine discharge, and perhaps more effective implementation of environmental regulations. The sediments are dominated by low molecular weight PAHs suggesting anthropogenic input. Ratios of specific PAH isomer pairs suggest higher input of petrogenic over pyrogenic derived PAHs. Notably, the deposition of high molecular weight PAHs increase in mangrove surface sediments was due to lignite and firewood combustion. Because of their overall low concentrations in sediments it is unlikely these PAHs pose an immediate ecological hazard.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 93%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Polycyclic aromatic hydrocarbon fingerprints in the Pichavaram mangrove–estuarine sediments, southeastern India

Ranjan

Routh

Ramanathan

et al. 2012

Organic Geochemistry

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Influence of leaf age, species and soil depth on the authenticity and geographical origin assignment of green tea

Zhang

et al. 2019

Rapid Comm Mass Spectrometry

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Rationale Stable isotope fractionation occurring during leaf growth provides internal characteristics for identifying the geographical origin, traceability and authentication of tea. Studying the influence of leaf age, species and the relationship with the cultivated soil may reveal previously undocumented stable isotope fractionation mechanisms, and provide a deeper understanding of the physiological isotopic effects on the tractability and authentication accuracy of green tea to combat mislabeling and fraudulent conduct. Methods A total of 36 pairs of young (one bud with one leaf) and mature growth (older leaf) samples from two species of Longjing tea (Longjing #43 and Colonial cultivar) and corresponding cultivation soil samples from two different depth layers (0–20 cm and 20–40 cm) were collected in Westlake district, Hangzhou, Zhejiang province, China. Four stable isotope ratios (δ13C, δ15N, δ2H, and δ18O values) were measured using an elemental analyzer coupled with an isotope ratio spectrometer. Linear correlation and one‐way analysis of variance (ANOVA) statistical analyses were performed to investigate isotopic fractionation mechanisms during plant growth, and reflect the dynamic physiological processes from soil to leaf. Results The carbon and nitrogen isotope ratios (δ13C and δ15N values) reflected the absorption, migration and fractionation of carbon dioxide and nitrogenous nutrients during photosynthesis, nutrient uptake, nitrogen fixation and leaf respiration. The water isotope ratios (δ2H and δ18O values) reflected the use and fractionation of water by tea plants at different growth stages. Conclusions Considerable differences were found for hydrogen and oxygen isotope ratios according to leaf age, revealing complex isotopic fractionation mechanisms and possible interference factors. Leaf maturity effects should be considered, as they will influence the precision and accuracy of models when assigning the geographical origin, traceability and authentication of tea.

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Seasonal dynamics of mangrove outwelling and its impact on estuarine productivity: insights from multi-parameter analysis across tidal variations

Seleyi,

Ravindran,

Mohandass

et al. 2024

Aquat Sci

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Elemental and stable isotope records of organic matter input and its fate in the Pichavaram mangrove–estuarine sediments (Tamil Nadu, India)

Cited by 73 publications

References 45 publications

Polycyclic aromatic hydrocarbon fingerprints in the Pichavaram mangrove–estuarine sediments, southeastern India

Polycyclic aromatic hydrocarbon fingerprints in the Pichavaram mangrove–estuarine sediments, southeastern India

Influence of leaf age, species and soil depth on the authenticity and geographical origin assignment of green tea

Seasonal dynamics of mangrove outwelling and its impact on estuarine productivity: insights from multi-parameter analysis across tidal variations

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