Method for measuring bismuth content in colloidal bismuth pectin or colloidal bismuth pectin-containing preparation

摘要

Provided is a method for measuring the bismuth content in a colloidal bismuth pectin or a colloidal bismuth pectin-containing preparation. A protonic acid is used to dissociate bismuth from a colloidal bismuth pectin, the principle of the characteristic reaction between bismuth and potassium iodide to produce yellow potassium bismuth iodide is used, ultraviolet-visible spectrophotometry is used to perform measurements, and an external standard method is used to perform calculations. The method for measuring the bismuth content in a colloidal bismuth pectin or a colloidal bismuth pectin-containing preparation has strong specificity, a good linear relationship, high accuracy, good repeatability, high sensitivity, and may act as a quality control method for bismuth in a colloidal bismuth pectin or a colloidal bismuth pectin-containing preparation and effectively control product quality.