Effect of pH of aqueous ceramic suspensions on colloidal stability and precision of analytical measurements using slurry nebulization inductively coupled plasma atomic emission spectrometry

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Colloidal stability of silicon nitride, silicon carbide and boron carbide aqueous slurries used for slurry nebulization inductively coupled plasma atomic emission spectrometry has been investigated in the pH range 2-10 by electrophoretic mobility and particle size measurements, together with sedimentation tests. The mean particle size of silicon nitride and silicon carbide suspensions change with increasing pH showing a maximum at the isoelectric points (pH 7.5 and 5.5 respectively). The particle size distribution of boron carbide slurries remains practically constant and the zeta-potential of suspended boron carbide particles shows a small change in the pH range investigated. The silicon nitride and silicon carbide slurries have good stability at pH below 5 and above 8, respectively. Boron carbide slurries show excellent stability in the whole pH range investigated. The time demand for stabilization of the emission line intensities from the start of nebulization strongly depends on the colloidal stability of slurries. Consequently, it is advantageous to nebulize aqueous suspensions with a pH as far from the isoelectric point of the solid as possible and with the ionic strength of the dispersion medium as low as possible. The RSD values of the line intensity measurements determined after 3 min stabilization time decrease with increasing stability of the aqueous slurries.

Original languageEnglish
Pages (from-to)253-259
Number of pages7
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume51
Issue number2
DOIs
Publication statusPublished - Jan 30 1996

Keywords

  • BC
  • Ceramics
  • Colloidal stability
  • ICP AES
  • SiC
  • SiN
  • Slurry nebulization

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

Fingerprint Dive into the research topics of 'Effect of pH of aqueous ceramic suspensions on colloidal stability and precision of analytical measurements using slurry nebulization inductively coupled plasma atomic emission spectrometry'. Together they form a unique fingerprint.

  • Cite this