Abstract
Ag bioaccumulation upon exposure to pristine Ag NPs is of bigger concern in acidic sandy soils, but not in case of the environmentally relevant sulfidized Ag NPs, which do not bioaccumulate in P. scaber or F. candida.
Highlights
IntroductionThe latter is dependent on the rate of dissolution of Ag NPs and the mobility of released Ag ions in the soil
Measured total Ag concentrations in the test soils are presented in Table S1.† We report the total Ag concentrations at the start of the experiment, which were used as Cexp in the 2738 | Environ
P. scaber Ag body concentrations from exposures to ionic Ag and pristine Ag NPs showed an increase during exposure to spiked soil and mostly no evident decrease after transfer to clean soil (Fig. 1)
Summary
The latter is dependent on the rate of dissolution of Ag NPs and the mobility of released Ag ions in the soil. To derive kinetic rate constants, biokinetic models of varying complexity can be applied, where different transformation processes and NP species can be included in the model descriptions.[7,8] Due to analytical challenges in discriminating between ionic and particulate metal forms associated with NP exposure in soil and organisms, models based on total metal concentrations are still frequently applied. The simplest model considers the organism as a single compartment, but more compartments can be assumed, depending on the physiological traits of the test organism.[7] It has been argued that the data obtained for soil invertebrates are frequently not precise enough to discriminate more than one compartment[9] and that parameterization of simple models should be pursued.[8]
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