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The Toxics Studies Unit in Ecology 's Environmental Assessment Program conducts monitoring to evaluate the occurrences and risks from toxic chemicals in Washington 's environment . The toxic effects of cadmium ( " itai-itai disease " ) were discovered in a similar way . The toxic compounds in tall fescue are present in very small quantities ( parts per million and parts per billion levels ) and in some cases are destroyed by the way that samples are handled . The toxic effects caused by acute exposure to arsenic trioxide are due in large part to its ability to bind to cellular proteins containing sulfhydryl groups . The toxic endpoints used in risk assessments for calculating safe fish consumption levels are subtle ( the effects are not easily recognizable or attributable to a particular exposure and that exposure does not cause immediate harm ) . " The toxic ghost fleet must not enter British waters .