2015YS/T 569.2-2015 Methods for chemical analysis of thallium.Part 2:Determination of iron content.Phenanthrolin spectrophotometry
2006YS/T 569.2-2006 Determination of iron content in thallium (o-phenanthroline absorptiometry)
YS/T 569.2-2006 Determination of iron content in thallium (o-phenanthroline absorptiometry) has been changed from GB/T 2592.2-1981 Thallium--Determination of iron content--1,10-phenanthroline photometric method.