Method for analytically determining oxygen for each form of oxide

A method for analyzing a metal for oxygen in each oxide inclusion, comprising the steps of:

• placing a metal analyte in a graphite crucible in an inert gas atmosphere;
• heat-melting the metal analyte;
• extracting a CO gas from the melt bath;
• and
• analyzing the gas to determine the oxygen content of the metal in the form of a plurality of waves, wherein, for each wave which appears at a temperature of 900.degree. C. or above, the following temperature control pattern of 1, 2, and 3 is repeated:
• 1 the analyte is heated at a temperature rise rate of not more than 2.degree. C./sec in a period from a starting point A.sub.n of each wave to a peak point B.sub.n of each wave;
• 2 the analyte is held at a constant temperature in a period from the peak point B.sub.n of each wave to an end point C.sub.n of each wave;
• and
• 3 the analyte is heated at a temperature rise rate of not more than 2.degree. C./sec in a period from the end point C.sub.n of each wave to a starting point A.sub.n-1 of the next wave.