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Minerals01:26

Minerals

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Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
 
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Related Experiment Video

Updated: Jul 13, 2025

Study on the Metabolism of Six Systemic Insecticides in a Newly Established Cell Suspension Culture Derived from Tea Camellia Sinensis L. Leaves
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Selenium foliar application contributes to decrease ratio of water-soluble fluoride and improve physio-biochemical

Huiliang Niu1, Kui Zhan1, Xin Cheng1

  • 1School of Tea & Food Science and Technology, Anhui Agricultural University, State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, Anhui, China.

Ecotoxicology and Environmental Safety
|October 13, 2023
PubMed
Summary
This summary is machine-generated.

Selenium (Se) foliar spray effectively reduces fluoride (F) accumulation in tea leaves by binding it to cell walls. This application also lowers heavy metal content and enhances beneficial compounds, offering a safe strategy to improve tea quality.

Keywords:
Camellia sinensisCell wallFluorideFoliar sprayingPectinSelenium

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Plant Physiology

Background:

  • Tea plants absorb environmental fluoride (F), leading to high F levels in leaves.
  • Consumption of high-F tea poses health risks to humans.
  • Investigating mitigation strategies for F accumulation in tea is crucial.

Purpose of the Study:

  • To evaluate the effect of selenium (Se) foliar application on F accumulation in tea plants.
  • To assess the impact of Se on heavy metal content and physiological parameters in tea leaves.

Main Methods:

  • Foliar spraying of different selenium compounds (Na2SeO3, Kappa-selenocarrageenan, Selenomethionine, Nanoselenium).
  • Quantification of fluoride, heavy metals (Cr, Cd, Pb, Cu), and Se content in tea leaves.
  • Analysis of physiological indicators including enzyme activities, lipid peroxidation, chlorophyll, carotenoids, catechins, EGCG, and caffeine.

Main Results:

  • All tested Se forms significantly reduced F content in tea leaves (10.17%-45.99%).
  • Se application increased F binding in pectin within cell walls, decreasing water-soluble F.
  • Se significantly decreased Cr, Cd, Pb, and Cu levels while increasing Se content and organic Se transformation (>80%).
  • Se treatment enhanced antioxidant enzyme activities (peroxidase, catalase), increased chlorophyll, carotenoids, catechins, EGCG, and caffeine, and reduced malondialdehyde.

Conclusions:

  • Foliar selenium application is an effective strategy to reduce fluoride accumulation in tea leaves.
  • Selenium application mitigates heavy metal contamination and improves the physiological status and phytochemical content of tea plants.
  • Se application presents a safe and efficient method for diminishing fluoride concentration in tea, enhancing its health and quality.