Abstract
The concentration data and toxicity data of seven booster biocides were collected, and a tiered assessment was performed to evaluate their ecological risk. Results indicated that Diuron and Irgarol 1051 had the highest concentrations; Irgarol 1051 and GS26575 were the most toxic. A tiered risk assessment implied that the risk of six biocides and one degradation product followed the order: Irgarol 1051 > GS26575 > Diuron (or Diuron > GS26575) > DCOIT > Dichlofluanid ≈ Chlorothalonil > BIT. Apparently, the top three biocides with the highest risk were Irgarol 1051, GS26575 and Diuron. The 70.6%, 33.3% and 6.76% concentration data of Irgarol 1051, GS26575 and Diuron behaved high risk, respectively. They could impact 2.54%-14.4% species in the common case, and impact 7.08%-48.1% species in the worst case. Irgarol 1051 posed great risk to China, Brazil and UK; GS26575 posed no significantly different risk to different countries; Diuron posed high risk to Spain and Italy.
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