Recall persistent organic pollutants (POPs) from Chapter 1 (see Box 1.4). A POP is a chemical that persists and bioaccumulates in the environment1 – that is, a chemical accumulates in a particular living creature faster than it can be eliminated. And the chemical is toxic.2 In this chapter, PBT (persistent, bioaccumulative, toxic) is used synonymously with POP because all POPs are PBTs. However, the opposite is not true: In Chapter 15 you will see three metal PBTs, so not all PBTs are POPs.3
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