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- W4313481522 abstract "Abstract Particle tracers are sometimes used to track sources and sinks of riverine particulate and contaminant transport. A potentially new particle tracer is ~200 nm sized superparamagnetic silica encapsulated DNA (SiDNAFe). The main objective of this research was to understand and quantify the settling and aggregation behaviour of SiDNAFe in river waters based on laboratory settling experiments. Our results indicated, that in quiescent conditions, more than 60% of SiDNAFe settled within 30 h, starting with a rapid settling phase followed by an exponential‐like slow settling phase in the three river waters we used (Meuse, Merkske, and Strijbeek) plus MilliQ water. In suspensions of 1000× higher particle concentrations, the hydrodynamic diameter ( D h‐DLS ) of SiDNAFe increased over time, with its polydispersity index (PDI) positively correlated with particle size. From these observations, we inferred that the rapid SiDNAFe settling was mainly due to homo‐aggregation and not due to hetero‐aggregation (e.g., with particulate matter present in river water). Incorporating a first‐order mass loss term which mimics the exponential phase of the settling in quiescent conditions seems to be an adequate step forward when modelling the transport of SiDNAFe in river injection experiments. Furthermore, we validated the applicability of magnetic separation and up‐concentration of SiDNAFe in real river waters, which is an important advantage for carrying out field‐scale SiDNAFe tracing experiments." @default.
- W4313481522 created "2023-01-06" @default.
- W4313481522 creator A5004246268 @default.
- W4313481522 creator A5019723104 @default.
- W4313481522 creator A5036164025 @default.
- W4313481522 creator A5048915938 @default.
- W4313481522 creator A5074408083 @default.
- W4313481522 creator A5080271346 @default.
- W4313481522 creator A5082565717 @default.
- W4313481522 date "2023-01-01" @default.
- W4313481522 modified "2023-10-12" @default.
- W4313481522 title "Settling of superparamagnetic silica encapsulated <scp>DNA</scp> microparticles in river water" @default.
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