A new photodegradable molecule as a low impact ballast water biocide: efficacy screening on marine organisms from different trophic levels

Marine species carried by the ships’ ballast waters are a potentially serious environmental problem. Many strategies are being adopted to minimize the transfer of invasive or pathogenic marine species between different aquatic ecosystems. This problem is often addressed by using biocides for ballast water treatment; however, the biocide could be dangerous to native organisms once the ballast water is discharged. Chemical treatments such as chlorination and addition of glutaraldehyde could cause problems related to toxicity and application costs. The search for new effective molecules with a low environmental impact is pressing. This paper presents data from a preliminary efficacy screening of a promising molecule derived from alkylated naphtoquinones on a battery of ballast water model organisms. Results show that this new molecule is very effective in the absence of light and is extremely photodegradable (half-life <6 h). It can thus be easily degraded when released in the environment.

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