Table 4 Measurement of pH for real samples using a pH a meter and the pH strip proposed in this study.

From: The pursuit of further miniaturization of screen printed micro paper-based analytical devices utilizing controlled penetration towards optimized channel patterning

 

pH meter

pH strip

Average error

Standard deviation

%RSD (%)

1st try

2nd try

3rd try

4th try

DI water

6.270 ± 0.030

6.118

6.212

6.118

6.572

0.086

0.196

3.1

Tap water

7.327 ± 0.040

8.088

7.575

7.665

7.746

0.442

0.224

2.9

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