![]() ![]() ![]() 7Be: 10Be ratios confirmed that colloidal and particulate fractions were geochemically distinct, with corresponding ages of 120 ± 30 and 260 ± 45 days, respectively. Experimental desorption- K D was higher than in situ by a factor of 20 for 7Be and 4 for 210Pb ( n = 27), indicating that FRN sorption to particulates was irreversible. K D was inversely correlated with particulate mass concentration ( p C), a particle concentration effect (p.c.e.) that indicates that dissolved 7Be and 210Pb are bound to submicron colloids. ![]() Bulk deposition in situ-log( K D) averaged 4.27 ± 0.46 for 7Be and 4.79 ± 0.59 for 210Pb (±SD, n = 163), with corresponding activity-fractions particulate ( f P) = 24 and 48%. We investigated the partitioning of 7Be, 10Be, and 210Pb aerosols between operationally dissolved and >0.5 μm particulate fractions in wet and dry atmospheric deposition.
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