Abstract: A high-purity organic phosphine is obtained by washing organic phosphine or an organic solvent solution thereof with water, an alkaline aqueous solution or an acidic aqueous solution, whereby impurities, particularly, silicon compounds, 2-methoxy ethanol, and organic halides, contained in organic phosphine can be removed, so that such high-purity organic phosphine may be used as a raw material for high-performance compound semiconductor thin film with Groups III and V elements of the Periodic Table.

Abstract: In a printing apparatus, even if print position data and its associated printing data are inputted at random in a memory, the print position data are rearranged in a predetermined order in which to move a printing heat at a minimum distance during the printing of the data in the specified position. Specifically, the print position data are rearranged so that the printing head is moved from the top of a printing paper toward the bottom thereof. If a plurality of position data are specified which are printed on the same line, the printing head is moved from the left to the right of the line.