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Precipitation Gravimetry01:03

Precipitation Gravimetry

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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Related Experiment Video

Updated: Jul 11, 2026

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
10:31

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks

Published on: May 8, 2015

Flow injection visible diffuse reflectance quantitative analysis of nickel.

Matthieu Tubino1, Carlos A R Queiroz

  • 1Instituto de Química, Universidade Estadual de Campinas, CP 6154, CEP 13083-970 Campinas, SP, Brazil.

Analytica Chimica Acta
|October 2, 2007
PubMed
Summary

This study presents a new flow injection method for nickel analysis using diffuse reflectance. The method accurately quantifies nickel concentration with a low detection limit, offering a reliable analytical technique.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Chemical Analysis

Background:

  • Nickel analysis is crucial in various industrial and environmental applications.
  • Accurate and sensitive methods are needed for nickel quantification.
  • Existing methods may have limitations in terms of speed, cost, or sensitivity.

Purpose of the Study:

  • To develop and validate a flow injection (FI) methodology for nickel determination.
  • To utilize diffuse reflectance spectroscopy in the visible region for nickel analysis.
  • To assess the performance of the developed method for nickel quantification.

Main Methods:

  • Flow injection (FI) technique coupled with diffuse reflectance spectroscopy.
  • Nickel precipitated as nickel dimethylglyoximate.
  • A custom reflectance cell with a light-emitting diode (LED) and light-dependent resistor (LDR).
  • Analysis in the visible spectrum.

Main Results:

  • A quantitative correlation between analytical signal (S) and nickel concentration (C) was established between 1.6 x 10(-4) and 6.6 x 10(-4) molL(-1).
  • The correlation is described by the quadratic equation S=-1.108+3.314 x 10(4)C-2.081 x 10(7)C(2) with r=0.9996.
  • Experimental limit of detection (LOD) is approximately 1.3 x 10(-4) molL(-1).
  • Experimental quantitation limit (LOQ) is approximately 1.6 x 10(-4) molL(-1).
  • Mean relative standard deviation (R.S.D.) is approximately 2.7%.

Conclusions:

  • The developed flow injection diffuse reflectance method is effective for nickel analysis.
  • The method demonstrates good sensitivity and accuracy for nickel quantification.
  • The results obtained were validated by comparison with other methods using Student's t-test.