2011TCVN 8831-1-2011 Leather - Chemical determination of chromic oxide content .Part 1:Quantification by titration
2005TCVN 7429-2004 Leather.Determination of chromic oxide content by iodmetric titration
TCVN 7429-2004 Leather.Determination of chromic oxide content by iodmetric titration was changed to TCVN 8831-1-2011 Leather - Chemical determination of chromic oxide content .Part 1:Quantification by titration.