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. 2023 Jun 23;8(26):23643–23650. doi: 10.1021/acsomega.3c01670

Figure 4.

Figure 4

Absorbance spectra of 230 μg L–1 of vitamin D3 against blank regent after DES–SBSE (extraction conditions: sample solution 5.0 mL, stirring rate 900 rpm, 10 min of extraction, desorption time 3 min, temperature 30 °C).