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In this work, a direct determination of 238Pu determination using reactive gases, CO2 and H2 in triple quadrupole ICP-MS without prior radiochemical separation resins has been established. Quantification of 0.25 pg/mL 238Pu sample mixture (1.18 pg of 238Pu) yielded satisfactory results (> 95% accuracy), uncertainties of less than 15% and in the presence of spiked natural U (0.5 ng/mL). Additional verification of this method was performed using certified ratio materials (IRMM-086, Belgium) and experimental 238Pu/239Pu and 240Pu/239Pu values are analogous to the certified values provided. [ABSTRACT FROM AUTHOR]