(App. Table II-11a) Enrichment factors relative to the Earth's crust for chem...
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EF = (El_sample/Sc_sample) / (El_crust/Sc_crust)
富集因子(Enrichment Factor, EF)的计算公式为:EF = (样品中元素El的浓度与样品中钪(Scandium, Sc)的浓度之比) / (地壳中元素El的浓度与地壳中钪浓度之比)



