Introduction Molybdenum(Ⅵ) is a biologically essential traceelement and its role in an extremely wide variety of sys-tems has been reported. Most common methods oftenfail to determine trace Mo(Ⅵ) in the analysis of mo-lybdenum-containing samples, due to Molybdenum (Ⅵ) is a biologically essential trace element and its role in an extremely wide variety of sys-tems has been reported. Most common methods often determine to trace trace Mo (Ⅵ) in the analysis of mo-lybdenum-containing samples, due to