EF values are categorized as follows: no enrichment to minimal enrichment (EF < 2), moderate enrichment (2 < EF < 5), significant enrichment (5 < EF < 20), very significant enrichment (20 < EF < 40), and extremely significant enrichment (EF > 40) (Gope et al. 2018 ).
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Assessment of house dust trace elements and human exposure in Ankara, Turkey.
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