It has been found that both iron and cobalt are lost from lithium tetraborate fusions performed at 1 200 °C in graphite crucibles. The elements segregate as tiny pieces of metal near the graphite-fusion interface owing to reduction. The same reaction could well occur with other metals of lower affinity for oxygen than carbon and so these also would disappear from the fusion.
H. Bennett and G. J. Oliver, Analyst, 1971, 96, 427 DOI: 10.1039/AN9719600427
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