Аннотация:Abstract—A new index of lanthanide affinity to carrier phases in soil, ALn, differing from the traditional indexof lanthanide affinity, pCLn, has been proposed. The new affinity index has critical value ALn-critical = 1 andmakes it possible to compare phases extracted with different-strength reagents. The phase is enriched in lanthanides at ALn > 1 and depleted in them at ALn < 1. The index of lanthanide affinity, ALn, has shown itsadvantage over the accepted pCLn index during analysis of Russian and Swedish soils.Keywords: sequential chemical extraction of heavy metals, lanthanide carrier phases, European soil lanthanide clarkesDOI: 10.3103/S0147687422030127