The present invention relates to a method for preparing a sample for analysis of phosphorus (P) in carbon steel by inductively coupled plasma emission spectroscopy, and more particularly, to inhibit the volatilization of phosphorus (P) during ionization of carbon steel and to prepare a sample. The present invention relates to a sample preparation method for phosphorus analysis in carbon steel by an inductively coupled plasma emission spectrometer capable of quickly analyzing phosphorus (P) by simplifying the process. preparing a cleaning liquid composed of 1 to 5 ml / l hydrochloric acid; Processing a carbon steel sample containing phosphorus (P) and immersing it in the cleaning solution to perform primary cleaning; Removing the sample after the first cleaning is completed and immersing methyl alcohol in an ultrasonic cleaning container with a cleaning solution for second cleaning; Removing the sample after the second cleaning is completed and drying at room temperature; Weighing the dried sample and placing it in a sample ionization container made of Teflon; Adding nitric acid to a sample ionization vessel made of Teflon containing the sample as described above and oxidizing phosphorus (P), silicon (Si), and aluminum (Al) while gradually ionizing the sample while gradually heating it; Adding hydrochloric acid (HCl) and hydrofluoric acid (HF) to the ionized solution, followed by a desulfurization treatment with slow heating; Purifying the desulfurized solution by filtration; Containing the purified solution in a sample container of a constant volume to fill the mark accurately.
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