• Media type: E-Article
  • Title: Systematic and random error suppression in instrumentation for stripping (chrono)potentiometry
  • Contributor: Št’astný, Miloslav; Lepší, Pavel
  • Published: AIP Publishing, 1999
  • Published in: Review of Scientific Instruments, 70 (1999) 8, Seite 3439-3446
  • Language: English
  • DOI: 10.1063/1.1149934
  • ISSN: 0034-6748; 1089-7623
  • Keywords: Instrumentation
  • Origination:
  • Footnote:
  • Description: The stripping potentiometer based on the potentiometric and current-controlled stripping analysis (PSA/CSA) was improved with respect to hardware simplicity, data acquisition rate, and elimination of the effect of nonlinearity of the analog-to-digital converter. The effects of systematic, random, and frequency noise on the observed signal were studied and discussed. It was found that the Savitzky–Golay polynomial filtering can only be successfully applied to smooth out PSA/CSA records if both the random and frequency noise-to-signal ratio are suppressed to a level of a few percent by a suitable hardware arrangement (not only by software filters) and if the analog-to-digital converter error is eliminated. If this is not the case and a large portion of the original normally distributed random noise is present, digital smoothing does not yield the correct values and records are convoluted with a Gaussian function, which restrains both the sensitivity (peak heights) and resolution (by peak widening) of the PSA/CSA method.