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View Diary: BP's Gulf Oil Spill Was Worse Than You Thought (100 comments)

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  •  toxicity increases 50 fold with the addition of (3+ / 0-)
    Recommended by:
    indie17, mrkvica, KenBee

    corexit

    Abstract
    Using the marine rotifer Brachionus plicatilis acute toxicity tests, we estimated the toxicity of Corexit 9500A®, propylene glycol, and Macondo oil. Ratios of 1:10, 1:50 and 1:130 for Corexit 9500A®:Macondo oil mixture represent: maximum exposure concentrations, recommended ratios for deploying Corexit (1:10–1:50), 1:130 the actual dispersant:oil ratio used in the Deep Water Horizon spill. Corexit 9500A® and oil are similar in their toxicity. However, when Corexit 9500A® and oil are mixed, toxicity to B. manjavacas increases up to 52-fold. Extrapolating these results to the oil released by the Macondo well, suggests underestimation of increased toxicity from Corexit application. We found small differences in sensitivity among species of the B. plicatilis species complex, likely reflecting phylogenetic similarity. Just 2.6% of the water-accommodated fraction of oil inhibited rotifer cyst hatching by 50%, an ecologically significant result because rotifer cyst in sediments are critical resources for the recolonization of populations each Spring.
    ► Results suggest underestimation of increased toxicity due to Corexit application. ► Sensitivity differences are small among species of the B. plicatilis species complex.
    scientific sourcing

    Fuckers!!!

    "Say little, do much" (Pirkei Avot 1:15)

    by hester on Wed Apr 24, 2013 at 06:35:20 AM PDT

    •  Forgot to add this (4+ / 0-)
      Recommended by:
      indie17, mrkvica, BlackSheep1, KenBee
      The inhibition of egg hatching in bottom sediments is particularly ominous because rotifer eggs hatch each spring to live as adults in the water column where they are important food sources for larval and juvenile fish, for shrimp, crabs and other marine life in estuarine and shoreline ecosystems—including fisheries humans depend on.
      Source

      "Say little, do much" (Pirkei Avot 1:15)

      by hester on Wed Apr 24, 2013 at 06:37:10 AM PDT

      [ Parent ]

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