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Related Concept Videos

Flame Photometry: Lab01:16

Flame Photometry: Lab

In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
Potentiometry: Overview01:06

Potentiometry: Overview

Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...
Qualitative Analysis03:46

Qualitative Analysis

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.
For instance, group IV...
Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
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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Related Experiment Video

Updated: May 17, 2026

Making, Testing, and Using Potassium Ion Selective Microelectrodes in Tissue Slices of Adult Brain
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Published on: May 7, 2018

An improved non-destructive method of potassium determination.

Moumita Maiti1, Ajoy Mandal, Susanta Lahiri

  • 1Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata, India.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|October 23, 2012
PubMed
Summary

A new gamma spectrometry method accurately determines total potassium by measuring (40)K photo peaks. This non-destructive technique, using a Compton Suppressor System, minimizes background interference and chemical use, aligning with green chemistry principles.

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Area of Science:

  • Analytical Chemistry
  • Nuclear Chemistry
  • Environmental Science

Background:

  • Potassium determination often relies on correlating naturally occurring (40)K abundance with total potassium.
  • Previous methods using Geiger counters or basic gamma spectrometry faced significant background interference.
  • A need exists for a simpler, non-destructive, and environmentally friendly potassium determination method.

Purpose of the Study:

  • To develop a non-destructive method for accurate total potassium determination.
  • To overcome background interference issues in gamma spectrometric analysis of (40)K.
  • To validate a green chemistry-compliant method for potassium quantification.

Main Methods:

  • Utilized a heavily shielded Compton Suppressor System for gamma spectrometry.
  • Measured the (40)K photo peak area at 1460.82 keV for quantification.
  • Validated the method using NIST Standard Reference Materials (SRMs).

Main Results:

  • Successfully reduced background interference using the Compton Suppressor System.
  • Enabled accurate total potassium measurement by analyzing the (40)K photo peak.
  • Demonstrated method's efficacy through validation with NIST SRMs and comparison with WDXRF and ICP-OES.

Conclusions:

  • The developed Compton Suppressor System-based gamma spectrometry method offers a simple, non-destructive, and accurate approach for total potassium determination.
  • This technique adheres to green chemistry principles by avoiding chemical treatments and sample irradiation.
  • The method provides a reliable alternative to conventional techniques, with validated accuracy.