A simple and green analytical method for acid number analysis of biodiesel and biodiesel blends based on potentiometric technique

► A green and simple analytical method using green chemistry approaches is developed. ► A single-step green aqueous-based electrode cleaning procedure is developed. ► Accurate and reliable results for acid number of biodiesel and its blends obtained. ► This method could be used in R&D and QC labs for biodiesel and its blends analysis. ► Recommended as a reference method for the determination of acid number of biodiesel.