Quality control charts—information on low frequency noise from AAS

Atomic Spectroscopy

“…Flame atomic absorption spectrometry (FAAS) is a mature analysis method. Detailed innovation, however, still takes place with respect to studies on the noise, e.g., caused by pumps for on-line dilution (2) or studies on the low-frequency noise in general (3). Especially with respect to the nebulizers used, much still is to be done.…”

Atomic Spectrometry Update. Advances in atomic emission, absorption, and fluorescence spectrometry, and related techniques

“…Concentration measurements made over long time periods, as obtained in quality control charts, provided a possibility of gaining supplementary information about an analytical method. 416 Quality control charts for soil analysis by AAS with measurements lasting for more than 1000 d were studied and Fourier spectra at low frequencies obtained. When no distinguishable uncertainty sources were present, the noise power spectral density dependence on frequency was calculated.…”