Abstract：The application of “direct-dropping” in the analysis of oxygen, nitrogen and hydrogen in metal powder sample was discussed in detail. “Drect-dropping” was different from the traditional “packaging”, which was mainly reflected in the mode of sample dropping. “Direct-dropping” of sample avoided the influence of blank of packaging materials, and it could be applied for the analysis of oxygen, nitrogen and hydrogen in metal powder sample such as high temperature alloy, iron and steel, nickel and copper. The difference of blank between “direct-dropping” and nickel foil/tin foil as well as nickel capsule/tin capsule was firstly investigated. The results showed that the blank of “direct-dropping” was lowest, and the blank of nickel capsule was the second low. The “direct-dropping” was calibrated with the certified reference materials of JK47 iron powder and 502-903 columnar steel. Many application examples of powder samples of high temperature alloy were listed and the advantages of “direct-dropping” were obvious. Eight representative samples from six different materials were selected for the comparison tests between “direct-dropping” and nickel capsule/tin capsule “packaging”. The determination results of the above two methods were basically consistent. However, “direct-dropping” was not applicable for the analysis of oxygen and nitrogen in “flux-dependent” powder samples such as titanium, zirconium, niobium and chromium. Titanium powder and titanium block samples were used as study object: when the sample was directly dropped without package of flux, the analysis of oxygen and nitrogen would be seriously interfered and the error might be in the orders of magnitude. But “direct-dropping” could be used for the analysis of hydrogen, which was also suitable for the “flux-dependent” samples. The determination of hydrogen was not affected by the mode of sample dropping. Only when the metal powder sample was packaged with tin, the determination results of hydrogen were slightly different of a little higher. It should be noted that the “direct-dropping” was forbidden for the analysis of oxygen, nitrogen and hydrogen in active metal sample such as magnesium and aluminum neither for powder or block samples. Or else, the “direct-dropping” might cause the contamination of active metals or the failure of instrument
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