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A measurement procedure has been developed for the determination of δ44/40Ca and δ56/54Fe in geological samples by multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS) and thermal ionisation mass spectrometry (TIMS), combined with a single TODGA resin column for their separation. Using the TODGA resin for separation of geological materials, Fe and Ca ions were eluted by using 8 ml...
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