Abstract:

A rapid analytical method for potassium in low sodium salt was developed using a direct-reading ion-selective
electrode. System pH, the amount of total ionic strength adjustment buffer (TISAB), and other factors were optimized
in this study. The results showed that the linear range was 0.50–4000.00 mg/L with correlation coefficient (r) of 0.9994.
The detection limit was 0.063 mg/L, and the recovery was 100.2%–102.4% with RSD (n = 9) of 0.4%. The method
was simple, rapid, cheap and practical, and has been applied for in situ analysis of potassium in low sodium salt with
satisfying results.

Key words: ion selective electrode, direct reading of ion concentration, low sodium salt, potassium