Mkpịsị aka ngwungwu igwe kwụsiri ike, dị mfe iji n'ọnọdụ ọnọdụ ubi.Oke nchọta bụ 0-750mg/L, ọ nweghị reagents achọrọ, yana nsonaazụ nwere ike igosipụta ozugbo site na spectrophotometry.