Toxicity of oil-contaminated sediments in Louisiana salt marshes as ascertained with the commercial bioassay Microtox from 2011, 2014, and 2018

Toxicity tests were performed to investigate the health risk of weathered oil residues left in the salt marsh. The commercial bioassay Microtox was used to detect the “hot spots” of field contamination on salt marsh samples collected on 2011-01-06, 2014-10-23, and 2018-10-30 with the commercial Microtox® apparatus (model 500). Samples were run in triplicates. A subset of samples was carefully weighed to determine the dry weights. EC50 values are reported after moisture normalization.