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Related Concept Videos

The Phosphorus Cycle01:21

The Phosphorus Cycle

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Phosphorus-based metabolic pathway tracers in surface waters.

Vlastimil Packa1,2, Todd Howell1, Vadim Bostan2

  • 1Ontario Ministry of the Environment, Conservation and Parks, 125 Resources Road, Toronto, ON, M9P 3V6, Canada.

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|February 9, 2021
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Summary

Researchers used advanced 2D-IC-MS to analyze phosphate species in Lake Ontario, revealing distinct metabolic pathway activities in tributaries versus Toronto Harbour. This offers a deeper understanding of phosphorus cycling in aquatic ecosystems.

Keywords:
Ion chromatographyIsotope dilutionMass spectrometryMetabolic pathwaysP speciesP-metabolitesPhosphatePhosphate-containing metabolitesPhosphorus speciation

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Area of Science:

  • Environmental Chemistry
  • Aquatic Ecosystem Analysis
  • Analytical Chemistry

Background:

  • Surface water trophic status is typically assessed using soluble reactive phosphorus (SRP) and total phosphorus (TP).
  • Existing methods lack the resolution to identify specific phosphate-containing metabolites crucial for understanding aquatic metabolic processes.
  • Lake Ontario and its tributaries are vital ecosystems requiring detailed monitoring of nutrient dynamics.

Purpose of the Study:

  • To develop and apply a novel 2D-IC-MS method for simultaneous quantification of multiple phosphate species and metabolites.
  • To investigate the distribution and significance of various phosphate metabolites in Lake Ontario and its tributaries.
  • To differentiate metabolic pathway activities in different aquatic environments within the Lake Ontario system.

Main Methods:

  • Utilized two-dimensional ion chromatography mass spectrometry (2D-IC-MS) for precise analysis.
  • Simultaneously measured soluble phosphate (Pi), pyrophosphate (PPi), and eleven phosphate-containing metabolites (P-metabolites).
  • Employed multivariate statistical analysis to identify patterns and relationships in the collected data.

Main Results:

  • Quantified PPi, AMP, G-P, F-P, F-2P, R-P, R-2P, and PGA in lake and river samples.
  • Detected specific P-metabolites (R-P, R-2P, F-2P) in tributaries, linked to the Calvin cycle.
  • Observed a lack of these metabolites and higher PGA in Toronto Harbour, indicating depleted metabolic pathways (Calvin cycle, pentose phosphate, glycolysis).

Conclusions:

  • 2D-IC-MS provides unprecedented detail on phosphorus speciation in aquatic environments.
  • Distinct metabolic signatures related to phosphorus metabolites differentiate Lake Ontario tributaries from Toronto Harbour.
  • This approach enhances our understanding of nutrient cycling and metabolic function in freshwater ecosystems.