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Title: Improved solutions for zebra mussel control
Author: Costa, R. J.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2008
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The aim of the project presented in this dissertation was to develop improved chemical solutions for zebra mussel control. Three solution concepts were explored: (i) the combination of toxins; (ii) the encapsulation of toxins; and (iii) the exploitation of the seasonality of the species’ tolerance to toxins. The potential of binary mixtures of potassium chloride and poly(diallyldimethyl ammonium chloride) (polyDADMAC) as well as quaternary mixtures containing these chemicals and niclosamide ethanolamine salt and 2-(thiocyanomethylthio)benzothiazole (TCMTB) as assessed. Potassium chloride and polyDADMAC were observed to act more than additively on adult zebra mussels. The examination of the joint effects of these two toxins also suggested that potassium chloride dosages as low as 10mg/l impair the ability of the zebra mussels to perceive the presence of other biocides in the water column, and as a result inhibit protective valve closure responses. This study indicated that the combined application of potassium chloride and polyDADMAC (and possible other pairs of toxins) is likely to be of great practical value. The study of the performance of the quaternary antagonised in the presence of the others. Furthermore, the joint action of the four toxins was observed to be less than additive, and the sensitivity of the animals to potassium chloride and polyDADMAC decreased in the presence of niclosamide ethanolamine salt and TCMTB. These results seriously compromise the potential of the quaternary mixture for zebra mussel control. A promising polyDADMAC-loaded formulation was developed. The encapsulated biocide was shown to double the polymer toxic effects (even under rather unfavourable laboratory testing conditions).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available