![]() The evaluation of the effect of temperature, extracting agent and centrifugation speed and time on the extraction yield was carried out through a multifactorial analysis of variance which allows us to select 289 g, 5 min and 20 mM sodium pyrophosphate tetrabasic as optimal extraction conditions. This study develops for the first time an analytical method for the characterization of silver and gold nanoparticles in sewage sludge.
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