What is the oxygen content of reduced iron oowder? How to measure?

The hydrogen loss in iron powder equal to the oxygen content in iron powder.

The principle of oxygen content in hydrogen:

Hydrogen damage method is put 5 g with metal powder sample of lubricant in corundum boat calcining in pure hydrogen flow within a period of time, calcination, iron powder combination of oxygen and hydrogen to generate vapor discharge reduces the total weight of powder, reduce the value of the powder sample weight percent is the hydrogen loss value.

The defects of the oxygen content of iron powder measured by hydrogen damage method.

(1) metal oxide in powder metal oxide can be reduced.
(2) of high melting point metal (nonvolatile metal) hydrogen loss value is approximate reflect the oxygen content in powder, because in the process of calcination, powder of SiO2, Al2O3 and MgO style, oxygen impurities such as CaO cannot be restored, and some of the oxygen impurity C, S etc. It can produce volatile compounds with hydrogen discharge, at the same time, the powder surface adsorption gas impurities and powder in low melting point metal zinc, Cd, Pb, etc are volatile, so brought difficult to accurate measurement of oxygen content.

To sum up, the oxygen content determination of oxygen content is not the total oxygen content.