2015YS/T 569.6-2015 Methods for chemical analysis of thallium.Part 6:Determination of lead content.Dithizone benzene extraction spectrophotometry
2006YS/T 569.6-2006 Determination of lead content in thallium (dithizone benzene extraction absorptiometry)
YS/T 569.6-2006 Determination of lead content in thallium (dithizone benzene extraction absorptiometry) has been changed from GB/T 2592.6-1981 Thallium--Determination of lead content--Dithizone extraction photometric method.