An Environmentally Friendly Compact Microfluidic Hydrodynamic Sequential Injection System Using Curcuma putii Maknoi & Jenjitt. Extract as a Natural Reagent for Colorimetric Determination of Total Iron in Water Samples

Figure 4

(a) The absorbance spectra of the Curcuma putii Maknoi & Jenjitt. extract-iron complex in water. (b) The absorbance spectra of the Curcuma putii Maknoi & Jenjitt. extract-iron complex in acetate buffer solution. (c) The absorbance spectra of the Curcuma putii Maknoi & Jenjitt. extract-iron complex in ethanol.

(a)

(b)

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