Field Determination of Phosphate in Environmental Water by Using a Hand-Powered Paper Centrifuge for Preconcentration and Digital Image Colorimetric Sensing

<div>Calibration curves of the PMB-SPE method. Batches were color coded: red, 0–1 <i>μ</i>M (<i>n</i> = 3); blue, 2–5 <i>μ</i>M (<i>n</i> = 3); green, 6–12 <i>μ</i>M (<i>n</i> = 1); and purple (with photos), 0–5 <i>μ</i>M (<i>n</i> = 3).</div>

Journal of Analytical Methods in Chemistry

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Figure 6

Figure 6: Field Determination of Phosphate in Environmental Water by Using a Hand-Powered Paper Centrifuge for Preconcentration and Digital Image Colorimetric Sensing 

Figure 6 | Field Determination of Phosphate in Environmental Water by Using a Hand-Powered Paper Centrifuge for Preconcentration and Digital Image Colorimetric Sensing 