Organic carbons and TOC in waters: an overview of the international norm for its measurements

At present, definitive rules about TOC measurement are not laid down by law; so, we consider it interesting to present the chronological list of the rules with their content concerning the measurement method, the sensitivity and detection limit, and the matrices that must be subjected to the control. Consideration about the measurement quality and the correspondence between rules and analytical power are out of the interest of this work.