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Related Concept Videos

Potentiometry: Overview01:06

Potentiometry: Overview

2.4K
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...
2.4K
Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

1.8K
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...
1.8K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

685
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
685
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

230
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...
230
Gravimetry: Overview01:05

Gravimetry: Overview

6.2K
Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
6.2K
Precipitation Gravimetry01:03

Precipitation Gravimetry

6.8K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
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A Multi-Pumping Gradient Calibration Module for Potentiometric Determination of Nitrate in Surface Water.

Sławomir Kalinowski1, Paweł Kościelniak2, Elwira Wierzbicka1

  • 1Department of Chemistry, University of Warmia and Mazury in Olsztyn, 10-957 Olsztyn, Poland.

Molecules (Basel, Switzerland)
|January 21, 2023
PubMed
Summary

A new automated flow system precisely measures nitrate in surface water. This multi-pumping flow system (MPFS) offers accurate and repeatable results, validated against established methods.

Keywords:
calibrationflow analysision selective electrodenitratesolenoid micro-pump

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Water Quality Monitoring

Background:

  • Accurate nitrate determination is crucial for surface water quality assessment.
  • Traditional methods can be time-consuming and labor-intensive.
  • Need for automated, precise, and reliable analytical systems.

Purpose of the Study:

  • To introduce a novel, automated multi-pumping flow system (MPFS) for online nitrate analysis.
  • To evaluate the system's performance in terms of linearity, repeatability, and accuracy.
  • To compare the MPFS results with a reference method for surface water samples.

Main Methods:

  • Development and implementation of an automated MPFS with variable volume micropumps (10, 20, 50 µL).
  • Online preparation of up to seven standard solutions from a single standard.
  • Nitrate determination using a commercially available ion-selective electrode (ISE) in stop-flow mode.
  • Validation using surface water samples and Certified Reference Material.

Main Results:

  • High precision of micropumps (R.S.D. < 1%) ensured repeatable results.
  • Calibration linearity and slope were primarily influenced by ISE characteristics.
  • Statistically insignificant differences were observed between MPFS and reference methods at a 96% confidence level.
  • Relative deviation of 5% confirmed accuracy when analyzing Certified Reference Material.

Conclusions:

  • The automated MPFS provides a precise and accurate method for online nitrate determination in surface water.
  • The system's high repeatability and accuracy make it a viable alternative to conventional methods.
  • The MPFS demonstrates significant potential for routine water quality monitoring applications.