Abstract
Brilliant Blue is often used to trace water movement in soils. Its concentration in soil samples is usually determined by extraction – a laborious procedure with varying accuracy. We show that Brilliant Blue can be estimated directly by visible diffuse reflectance spectroscopy. We build a PLSR (partial least squares regression) model for the concentration range of 0.1 to 15 mg Brilliant Blue per g soil with an RMSE (root mean square error of prediction) of 1 mg g-1 and an R2adj of 0.9. However, as the method is based on visible spectra, prediction accuracy can be altered by variations in soil colour between calibration and prediction data sets.
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Bogner, C., Schmiedinger, I. & Huwe, B. Rapid estimation of Brilliant Blue concentrations in soil by diffuse reflectance spectroscopy. Nat Prec (2010). https://doi.org/10.1038/npre.2010.4293.1
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DOI: https://doi.org/10.1038/npre.2010.4293.1