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Related Concept Videos

EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides and...
Complexometric EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

EDTA titration curves determine the free metal ion concentration. The titration curve represents the change in concentration of free metal ions (p function) as a function of the volume of EDTA added. This curve consists of three regions: before, at, and after equivalence points. Excess free metal ions are present before the equivalence point. Equal concentrations of metal ions and EDTA are present at the equivalence point. After the equivalence point, excess EDTA exists. This means slight...
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...
EDTA: Indirect and Alkalimetric Titration01:23

EDTA: Indirect and Alkalimetric Titration

Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...

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Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
10:44

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Correlation between total and EDTA/DTPA-extractable trace elements in soil and wheat.

O Cankur1, N K Aras, I Olmez

  • 1Middle East Technical University, Ankara, Turkey.

Biological Trace Element Research
|February 17, 2000
PubMed
Summary

Wheat consumption varies globally, with Turkish diets featuring higher intake. Trace element analysis in Turkish wheat revealed soil-derived elements strongly correlated, while atmospheric pollutants like arsenic and selenium showed less correlation with soil sources.

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Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil

Published on: September 1, 2020

Area of Science:

  • Agricultural Science
  • Environmental Chemistry
  • Food Science

Background:

  • Wheat is a crucial dietary staple, providing essential energy and nutrients globally.
  • Significant regional differences exist in wheat consumption, with Turkey showing notably high daily intake.
  • Understanding trace element content in wheat is vital for nutritional and environmental assessments.

Purpose of the Study:

  • To determine the trace element composition of wheat samples from different Turkish regions.
  • To investigate the relationship between soil trace element content and wheat accumulation.
  • To differentiate between soil-derived and anthropogenic sources of trace elements in wheat.

Main Methods:

  • Instrumental Neutron Activation Analysis (INAA) for trace element analysis in wheat and soil.
  • Atomic Absorption Spectrometry (AAS) for soil analysis (total, EDTA-extractable, and DTPA-extractable elements).
  • Correlation analysis and enrichment factor calculations to assess element sources.

Main Results:

  • Strong positive correlations were observed between soil-derived trace elements (e.g., Sc, La, Sm, Rb, K) in wheat.
  • Selenium (Se) concentrations exhibited significant regional variability.
  • Trace elements with anthropogenic sources, such as Arsenic (As) and Selenium (Se), showed no significant correlation with soil content.

Conclusions:

  • Wheat's trace element profile is significantly influenced by soil composition for soil-derived elements.
  • Regional variations in Se concentration suggest complex uptake mechanisms or diverse sources.
  • Atmospheric deposition plays a minor role in the accumulation of As and Se in wheat compared to soil influence.