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Table 3 Univariable analysis results based on Cd spectral lines

From: Quantitative analysis of cadmium in rice roots based on LIBS and chemometrics methods

Pretreatment methods

Wavelength (nm)

Calibration set

Prediction set

Rc

RMSEC (mg/kg)

Rp

RMSEP (mg/kg)

Raw

214.44

0.8812

74.6

0.9295

61.5

226.50

0.8703

77.8

0.9222

65.0

228.80

0.5495

133.0

0.6529

128.0

After pretreatmenta

214.44

0.9822

29.5

0.9786

33.7

226.50

0.9840

28.1

0.9794

33.2

228.80

0.9548

46.8

0.9626

46.4

  1. Bold emphasis: the optimal model for given conditions
  2. a Pretreatment methods: MAD, WT and area normalization