GB / T 12496.7-1999 wooden activated carbon -- Determination of pH value

1. principle

The wet sample is boiled and filtered in the water without carbon dioxide. After it is cooled to room temperature, it is measured with indicator.

2. steps

A. instrument

Balance

Funnel

③ Colorimetric tube

b. Operation method

Weigh 2.5G of wet sample (accurate to 0.01g), place it in a 100ml conical flask, add 50ml of distilled water, heat it, boil it gently for 5min, supplement the evaporated distilled water, filter it, return the initial 5ml to the funnel, dilute it to the full scale with distilled water, and measure it with pH acidity meter.