2018CJ/T 51-2018 Standard test method for urban sewage water quality
2004CJ/T 51-2004 Methods for the examination of municipal sewage
1999CJ/T 61-1999 Municipal sewage.Determination of sulphate.Gravimetric method
CJ/T 61-1999 Municipal sewage.Determination of sulphate.Gravimetric method was changed to CJ/T 51-2004 Methods for the examination of municipal sewage.