Ma. Gouveia et al., ELEMENTAL CONCENTRATION DATA FOR USGS GEOCHEMICAL-EXPLORATION REFERENCE MATERIALS GXR-1 TO GXR-4 AND GXR-6, Journal of radioanalytical and nuclear chemistry, 179(1), 1994, pp. 165-172
Instrumental neutron activation analysis, atomic absorption spectromet
ry and conventional methods were used on five USGS Geochemical Explora
tion Reference Materials: GXR-1, 2, 3, 4 and 6. The concentrations of
35 elements are reported and compared with available literature values
. In general the agreement is good.