Hongqiu Zhu, Junming Chen, Chunhua Yang, Yonggang Li, Juan Gong. Spectral Pretreatment Method for Detection of Trace Cu
2+ and Co
2+ in Zinc Solution
[J]. Acta Optica Sinica, 2019, 39(1): 0130001
- Acta Optica Sinica
- Vol. 39, Issue 1, 0130001 (2019)
Fig. 1. Spectra analysis of three single ions. (a) Original spectra of single ions; (b) ion proportion at wavelength point
Fig. 2. Spectral signals with different orders. (a) Original spectral signals; (b) original spectral filtering signals; (c) first-order spectral filtering signals; (d) second-order spectral filtering signals
Fig. 3. Relationship among coverage degrees and orders for different ions. (a) Co2+; (b) Cu2+
Fig. 4. Fitting plot of order and distortion degree with wavelet filtering-fractional differentiation method
Fig. 5. Non-inferior solution sets of different ions. (a) Co2+; (b) Cu2+
Fig. 6. Spectra with different differential orders. (a) Original spectra; (b) first-order spectra; (c) second-order spectra; (d) 1.4-order spectra; (e) 1.5-order spectra
Fig. 7. Wavelength point selection based on multi-index fusion feature after pretreatment
Fig. 8. Errors between predicted and actual mass concentrations of different ions. (a) Co2+; (b) Cu2+
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Table 1. Selection of reagent system
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Table 2. Coverage degree and distortion degree with differentiation methods with different orders
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Table 3. Comparison of results by different pretreatments
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