Role of solution chemistry and ion valence on the adhesion kinetics of groundwater and marine bacteria.

摘要: The role of solution chemistry on bacterial adhesion has been investigated using a radial stagnation point flow (RSPF) system. This experimental system utilized an optical microscope and image-capturing device to directly observe the deposition kinetics groundwater bacterium, Burkholderia cepacia G4g, marine Halomonas pacifica g. Experiments were carried out under well-controlled hydrodynamic conditions, allowing for sensitivity behavior be examined range ionic strength valence (KCl vs CaCl2) simulating environments. Complimentary cell characterization techniques conducted evaluate electrophoretic mobility, hydrophobicity, surface charge density, viability bacteria same conditions. Solution was found have marked effect electrokinetic properties quartz collector, as well resulting rate deposition. Comparable trends observed B. G4g H. Specifically, rates two species in both KCl CaCl2 solutions increased with strength, trend consistent traditional Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, which considers combination van der Waals electrostatic double-layer interaction forces. However, some cases, results showed deviate from DLVO predictions. On basis systematic investigation characteristics, it that Ca2+ ions play distinct charge, behaviors. It is further suggested determined by combined influence interactions, electrosteric interactions associated chemistry, hydrodynamics