humic acid（Humic Acid, abbreviation HA）Also known as humic acid, it is a complex substance formed after the decomposition of natural plantsLarge molecule organic weak acid, widely present in peat and weathered coal, and also contains humic acid in some marine sediments. rot Colonic acid has pharmacological effects such as anti-inflammatory, hemostatic, promoting blood circulation and lowering blood pressure, promoting ulcer healing, and anti-tumor.

We used potentiometric titration to determine the content of total acidic groups in humic acid as a quality control standard.

1.1 Experimental apparatus

GT90Potentiometric titrator,

PH composite electrode,

10ml burette unit