Along with this finding, the heavy metal status of some metals is occasionally challenged on the grounds that they are too light, or are involved in biological processes, or rarely constitute environmental hazards.
Seiring dengan temuan ini, status logam berat beberapa logam terkadang ditentang dengan alasan bahwa mereka terlalu ringan, atau terlibat dalam proses biologis, atau jarang membahayakan lingkungan.