dear editor,<br /><br />I revised some of your edited sentences below. Can you please double check?<br /><br />1. Insights, especially the kinetics of nano-ZnO from cotransport by contaminant and from porous media preloaded with contaminat, and environmental factors affecting their release and retention in saturated sand are unveiled, along with a discussion on the environmental implications. The aforementioned two dominant transport mechanisms (<em>e.g.,</em> interparticle reactions and blocking effects) were derived. Significant deposition of nano-ZnO occurred from sand preloaded with a contaminant, implicating significant accumulation of NMs when contamiannts pre-exist on porous media.<br /><br />2. Specifically, based on half maximal inhibitoray concentrations (<em>i</em>.<em>e</em>., IC50s) ranging from 209 to 2051 mg/kg, significant toxicity effects of siloxane were observed for <em>Folsomia candida</em> (springtail) and <em>Hordeum vulgare</em> (barley).<br /><br />3. The C=O shown in nano-ZnO and TDMS is likely due to atmospheric CO<sub><span style="font-size: small;">2</span></sub> adsorption.<br /><br />thanks<br />
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