1. pH test paper method: drop Sodium Metabisulfite solution on the pH test paper, and judge the pH value according to the color change, so as to judge the purity of Sodium Metabisulfite.

2. Conductivity detection method: use conductivity meter to measure the conductivity of Sodium Metabisulfite solution, and calculate the concentration of Sodium Metabisulfite according to the relationship between conductivity and concentration.

3. Hydrometer method: use a Hydrometer to measure the specific gravity of Sodium Metabisulfite solution, and calculate the concentration of Sodium Metabisulfite according to the relationship between the specific gravity and the concentration.

How to Quickly Detect Purity and Concentration of Sodium Metabisulfite