ELEMENTAL CONCENTRATIONS IN THE SPINACH REFERENCE MATERIAL DETERMINEDBY K(O)-BASED INAA

The IAEA-331 spinach material NIST SRM 1570a Spinach Leaves, submitted to an intercomparison run by the IAEA, has been analysed by k(0)-base d INAA with counting using both low and high energy photon detectors. The results have been compared with (i) the certified values of the NI ST SRM 1570a; the agreement is good, taking into account the uncertain ties; and (ii) the certified and ''consensus'' values of the former NI ST SRM 1570 Spinach Leaves, their composition in minor and trace-eleme nts are quite similar; however a lower content has been observed for C o, Fe and Sc in the IAEA-331 and for Zn in the SRM 1570. For quality c ontrol, the NIST 1573 Tomato Leaves and the NIST 1575 Pine Needles hav e been analysed using the same conditions as for the IAEA-331. The res ults agree quite well with the certified and ''consensus'' values give n in the literature.