EPA

Speakeasy Science

Tag archives for EPA

Spills, Science and Semantics

Recently, I wrote a cranky little post about NOAA’s behavior regarding the Gulf of Mexico. The agency’s approach seemed to me to be timid and deferential at a time when I wanted a strong voice and and steady sense of purpose. What had set me off was the agency’s reluctance to use the word “plume”…

A Lethal Concentration

The standard toxicity test for chemical compounds is called the LD50. LD stands for Lethal Dose and 50 indicates 50 percent. In other words, LD50 means the lowest dose at which a material kills half of the test subjects. The results are usually given in milligrams of compound per kilograms of body weight. Many of…