pH-Phenol Red

Photometric test for pH in water at room temperature (20⁰C to 25⁰C) using Phenol Red

Colour Change

Yellow to Red

Range:

6.5 - 8.4 pH units

Technical Resource:

pH-Phenol Red Test Method, Technical Information

Notes:

High levels of chlorine or other disinfectants will cause an intense purple coloration. This will mean the result is not valid

Ionic strength, temperature and other water factors may have an effect on pH readings. This test has been calibrated for drinking and natural waters in the range 20°C to 25°C

Fill to the 10 mL line with sample.

Use this to "blank" the instrument. Place in cell holder and press Blank.

Prepare sample by adding a Phenol Red tablet and crush and stir.

Place the tube in the cell holder and press Measure to obtain the pH value.