Chromite is an important mineral for understanding igneous processes because it preserves primary geochemical signatures of mafic and ultramafic magmas. Trace elements in chromite, particularly the first-row transition elements (e.g., Co, Ni, Zn, and Mn) and Ga, provide important constraints on magma evolution processes. Development of chromite reference materials for LA-ICP-MS analysis commonly relies on acid digestion followed by solution ICP-MS analysis. However, chromite is a refractory mineral and may not be completely dissolved under conventional acid digestion conditions, which could potentially affect the accuracy of reference values. In this study, we evaluate the effects of apparent digestion efficiency on trace element analysis of the chromite reference material GPt-5. Four experimental groups were designed by combining two powder grain sizes (fine and ultrafine) with two digestion protocols (HF–HNO? digestion and aqua regia-assisted digestion). The results show that ultrafine grinding significantly improves visible digestion efficiency. However, despite these differences in digestion appearance, the four experimental groups yield broadly consistent concentrations for the first-row transition elements and Ga. These results indicate that incomplete digestion has only a limited effect on the final determination of most trace elements in chromite. This study also provides additional trace element measurements for the GPt-5 reference material, which are generally consistent with previously reported INAA recommended values, except for Zn, which shows systematically higher concentrations in the present study.