Body burden

The total amount of a substance in the body. Some substances build up in the body because they are stored in fat or bone or because they leave the body very slowly.

Source: ATSDR Glossary of Terms 

The amount of a particular chemical stored in the body at a particular time, especially a potentially toxic chemical in the body as a result of exposure. Body burdens can be the result of long-term or short-term storage, for example, the amount of a metal in bone, the amount of a lipophilic substance such as PCB in adipose tissue, or the amount of carbon monoxide (as carboxyhemoglobin) in the blood.

Source: US EPA Health Effects Glossary 

Bioaccumulation - Biologic intake - Biologic uptake - Half life

Fluoride

Dioxins

Aluminium exposure

Marine litter