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

Table 5

Comparison of the proposed method and spectrophotometric method for the determination of total iron in water samples.

Sample	Total iron (mg L^−1)^a
	Proposed method	Spectrophotometric method
1	6.17 ± 0.08	6.94 ± 0.01
2	2.15 ± 0.01	1.93 ± 0.01
3	1.32 ± 0.13	1.11 ± 0.03
4	11.79 ± 0.05	12.08 ± 0.09
5	9.91 ± 0.08	9.40 ± 0.07
6	2.00 ± 0.13	1.94 ± 0.01
7	2.08 ± 0.03	2.11 ± 0.01
8	2.09 ± 0.06	2.19 ± 0.01

^aMean of triplicate results.