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- W2022288295 abstract "Harmful algal blooms (HABs) occur worldwide causing serious threat to marine life, and to public health through seafood-borne illnesses and exposure to toxin-containing marine aerosol. This study was undertaken to assess the ability of phosphatic clay to remove the toxic dinoflagellate, Karenia brevis, and the potent neurotoxins (brevetoxins) produced by this species. Results showed that the addition of an aqueous slurry of 0.75 g (dry weight) clay to 3 l of K. brevis culture, containing 5×106 and 10×106 cells/l, removed 97±4% of brevetoxins from the water column within 4 h after the addition of clay. Clay flocculation of extra-cellular brevetoxins, released from cells ruptured (lyzed) by ultrasonication, removed 70±10% of the toxins. Addition of the chemical flocculant, polyaluminum chloride (PAC), removed all of the extra-cellular toxins. A 14 day study was undertaken to observe the fate of brevetoxins associated with clay flocculation of viable K. brevis cells. At 24 h following the clay addition, 90±18% of the toxins were removed from the water column, along with 85±4% of the cells. The toxin content of clay diminished from 208±13 μg at Day 1, to 121±21 μg at Day 14, indicating that the phosphatic clay retained about 58% of the toxins throughout the 14-day period. These studies showed the utility of natural clay as a means of reducing adverse effects from HABs, including removal of dissolved toxins, in the water column, although considerable work clearly remains before this approach can be used on natural blooms in open waters." @default.
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- W2022288295 date "2004-04-01" @default.
- W2022288295 modified "2023-09-30" @default.
- W2022288295 title "Removal of harmful algal cells (Karenia brevis) and toxins from seawater culture by clay flocculation" @default.
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- W2022288295 doi "https://doi.org/10.1016/j.hal.2003.09.003" @default.
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