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The Periodic Table and Organismal Elements01:27

The Periodic Table and Organismal Elements

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Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
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Other Algae01:19

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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Qualitative Analysis03:46

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae
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Metal(oid)s in Ulva - should we be worried?

Liliana Vargas-Murga1, Ömerhan Dürrani2, Jessica Adams3

  • 1Department of Chemical and Agricultural Engineering and Agrifood Technology, Polytechnic School, Universitat de Girona, 17003 Girona, Catalonia, Spain.

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Ulva seaweeds are nutritious but can accumulate toxic metals. This review highlights the need for standardized methods and species identification to ensure safe consumption and effective biomonitoring.

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Area of Science:

  • Marine Biology
  • Environmental Science
  • Food Science

Background:

  • Ulva spp. (sea lettuce) are recognized for their nutritional value and potential health benefits.
  • However, Ulva's capacity to accumulate trace elements, including toxic metals, poses food safety risks and offers opportunities for biomonitoring.
  • Variability in metal content necessitates a comprehensive understanding for safe utilization.

Purpose of the Study:

  • To critically review and synthesize existing literature on metal(oid) accumulation in Ulva.
  • To identify factors influencing element content and assess the safety of Ulva as a food resource.
  • To highlight research gaps and propose recommendations for future studies and applications.

Main Methods:

  • A systematic review and critical analysis of 176 peer-reviewed publications.
  • Data extraction focused on essential and non-essential element content in Ulva.
  • Analysis considered environmental conditions, geographic origin, morphology, and analytical techniques.

Main Results:

  • Significant variability in element content was observed across different Ulva samples.
  • Factors such as environmental conditions, geographic location, and analytical methods significantly influence metal accumulation.
  • Current data lacks detailed speciation of toxic elements (e.g., methylmercury, inorganic arsenic), limiting precise safety assessments.

Conclusions:

  • Standardized analytical protocols and improved taxonomic identification (using molecular tools) are crucial for reliable Ulva research.
  • Further investigation into understudied regions and element speciation is needed to accurately assess safety and biomonitoring potential.
  • Standardized cultivation practices are essential for controlling elemental composition in farmed Ulva for food and commercial use.