They didn't. The EPA asked them about this, and BP responded, and the EPA agreed with the response.
The statement is correct.
Toxicity and Effectiveness | Emergency Management | US EPA
Appendix C to 40 CFR part 300 (PDF) (23 pp, 187K, About PDF) describes methods for required effectiveness and toxicity tests for specific product categories.
|
Product |
Toxicity (LC50 values in ppm) |
Effectiveness (%) | |||
|---|---|---|---|---|---|
| Menidia (96-hr) |
Mysidopsis (48-hr) |
Prudhoe Bay Crude Oil |
South Louisiana Crude Oil |
Average of Crude Oils |
|
| BIODISPERS | 5.95 | 2.66 | 51.00 | 63.00 | 57.00 |
| COREXIT® EC9500A | 2.61 | 3.40 | 45.30 | 54.70 | 50.00 |
| COREXIT® EC9527A | 4.49 | 6.60 | 37.40 | 63.40 | 50.40 |
| DISPERSIT SPC 1000™ | 7.90 | 8.20 | 40.00 | 100.00 | 73.00 |
| FINASOL OSR 52 | 5.40 | 2.37 | 32.50 | 71.60 | 52.10 |
| JD-109 | 3.84 | 3.51 | 26.00 | 91.00 | 58.50 |
| JD-2000™ | 3.59 | 2.19 | 60.40 | 77.80 | 69.10 |
| MARE CLEAN 200 | 42.00 | 9.84 | 63.97 | 84.14 | 74.06 |
| NEOS AB3000 | 57.00 | 25.00 | 19.70 | 89.80 | 54.80 |
| NOKOMIS 3-AA | 7.03 | 5.56 | 63.20 | 65.70 | 64.50 |
| NOKOMIS 3-F4 | 100 | 58.40 | 62.20 | 64.90 | 63.55 |
| SAF-RON GOLD | 9.25 | 3.04 | 84.80 | 53.80 | 69.30 |
| SEA BRAT #4 | 23.00 | 18.00 | 53.55 | 60.65 | 57.10 |
| SEACARE ECOSPERSE 52 (see FINASOL® OSR 52) | 5.40 | 2.37 | 32.50 | 71.60 | 52.10 |
| SEACARE E.P.A. (see DISPERSIT SPC 1000™) | 7.90 | 8.20 | 40.00 | 100.00 | 73.00 |
| SF-GOLD DISPERSANT (see SAF-RON GOLD) | 9.25 | 3.04 | 84.80 | 53.80 | 69.30 |
| ZI-400 | 8.35 | 1.77 | 50.10 | 89.80 | 69.90 |
| ZI-400 OIL SPILL DISPERSANT (see ZI-400) | 8.35 | 1.77 | 50.10 | 89.80 | 69.90 |
I guess i don’t understand the chart you posted. IT looks like the Corexit has the lowest “toxicity number” in your chart for both 24 and 48-hour. But I have no idea what that number means, or if smaller is better.