This document specifies a method of determining the chlorine content of hard coal, brown coals and lignites, and coke using Eschka mixture.rd edition 2020-08 Coal and coke — Determination of chlorine using Eschka mixture Charbon et coke — Dosage du chlore à l'aide du mélange Eschka Reference number ISO 587:2020(E) ？ ISO 2020 ISO 587:2020(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of