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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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...
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...
Microbial Leaching01:27

Microbial Leaching

Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...

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Related Experiment Video

Updated: Jul 14, 2026

Atomic Absorbance Spectroscopy to Measure Intracellular Zinc Pools in Mammalian Cells
13:04

Atomic Absorbance Spectroscopy to Measure Intracellular Zinc Pools in Mammalian Cells

Published on: May 16, 2019

Zinc and copper in colostrum.

Petr Melnikov1, Aby Jaine da Cruz Montes Moura, Durval Batista Palhares

  • 1Department of Pediatrics, Federal University of Mato Grosso do Sul, Brazil.

Indian Pediatrics
|May 31, 2007
PubMed
Summary

Maternal age, parity, and miscarriage history did not significantly affect zinc and copper levels in early breast milk. Household water analysis also showed no correlation with these trace element concentrations in the milk.

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Last Updated: Jul 14, 2026

Atomic Absorbance Spectroscopy to Measure Intracellular Zinc Pools in Mammalian Cells
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Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon
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Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon

Published on: October 29, 2021

Area of Science:

  • Human Nutrition
  • Trace Element Analysis
  • Maternal Health

Background:

  • Zinc and Copper are essential trace elements crucial for infant development.
  • Breast milk composition can be influenced by various maternal factors.
  • Understanding these influences is vital for infant nutrition and health.

Purpose of the Study:

  • To investigate the relationship between maternal factors (age, parity, miscarriages) and trace element levels (Zinc, Copper) in colostrum.
  • To compare breast milk trace element levels with those found in household water.

Main Methods:

  • Analysis of Zinc and Copper content in colostrum samples from 117 Brazilian mothers.
  • Assessment of maternal age, parity, and miscarriage history.
  • Analysis of trace element content in corresponding household water samples.

Main Results:

  • No statistically significant correlation was observed between maternal age and Zinc or Copper levels in colostrum.
  • Parity and the number of miscarriages did not show a significant relationship with the measured trace element concentrations.
  • Household water trace element levels were analyzed in parallel but not found to be related to milk content in this study.

Conclusions:

  • Maternal age, parity, and miscarriage history are not significant determinants of Zinc and Copper levels in early human milk.
  • Further research may be needed to explore other potential factors influencing these essential trace elements in breast milk.