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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...

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A Simple Method for Automated Solid Phase Extraction of Water Samples for Immunological Analysis of Small Pollutants
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Published on: January 1, 2016

A rapid, simple method for determining formaldehyde in drinking water using colorimetric-solid phase extraction.

April A Hill1, Robert J Lipert, James S Fritz

  • 1Department of Chemistry, Institute for Combinatorial Discovery, Ames Laboratory-USDOE, Iowa State University, Ames, IA 50011, USA.

Talanta
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

A new colorimetric-solid phase extraction method quickly measures formaldehyde in water. This simple technique is suitable for microgravity environments, offering rapid and accurate detection of this common contaminant.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Space Science

Background:

  • Formaldehyde is a contaminant found in global drinking water and spacecraft water supplies.
  • Accurate and rapid detection methods are crucial for monitoring water quality.

Purpose of the Study:

  • To develop a rapid, simple, and microgravity-compatible method for formaldehyde detection in water.
  • To enable on-site and timely measurement of formaldehyde contamination.

Main Methods:

  • Utilized colorimetric-solid phase extraction (C-SPE) with Purpald reagent and sodium hydroxide.
  • Employed diffuse reflectance spectroscopy on-disk for product measurement.
  • Developed a calibration plot using Kubelka-Munk transformations.

Main Results:

  • The method accurately determines formaldehyde concentrations ranging from 0.08 to 20 ppm.
  • Total sample work-up time is less than 3 minutes.
  • The technique is compatible with microgravity conditions.

Conclusions:

  • The described C-SPE method provides a fast and efficient way to measure formaldehyde in water.
  • This technique is suitable for both terrestrial and extraterrestrial applications, including space missions.
  • The method offers a practical solution for monitoring formaldehyde contamination in diverse water sources.