Abstract
Fourier analysis of the real-time quality-control charts for colorimetric, photometric, and pH soil measurements shows 1/fn (n=1±0.05) noise intensity dependence on frequency, in correspondence to the earlier test for atomic absorption measurements. In addition, the prevailing character of the sample preparation in the general noise frequency dependence is clearly demonstrated. Some important analytical problems are addressed where knowledge of the specific character of the time variation in the analytical data sets is essential.
Published Version
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