Chemical Body Burdens:
o The quantitative amount of chemicals in our bodies that accumulates over times
o Most of the data is based on ANIMAL studies and can’t be done on humans because it is
unethical. Therefore, these data are somewhat comparable to humans but they are
great indicators of the direction of study.
o They are not stable over time. Their amount in the body changes over time because the
human body (special organs) may break down or rearrange the chemicals into other
chemicals. As well it is not distributed evenly throughout the body. For example, the
o There are some chemicals detected using detecting methods, but some are in so low
concentrations that they are not traceable.
o In Canada and the USA there is a program called biomonitoring which monitors the
common population to see how many chemicals are present in the average person and
if there are any health risks present.
Dioxins: gas when emitted but when then it becomes a chemical.
o Produced everywhere where there any form of combustion. Hamilton is significantly
contaminated with dioxins.
o No commercial usefulness/application. It is the by-product of combustion only. Even
during forest fires dioxins are produced.
o It is also produced during the manufacturing process.
o Dioxins are not just one chemical but a group of chemicals and have very similar
chemical structure. One of the most toxic and studied is 2, 3, 7, 8-tetrachlorodibenzo-p-
o The more chlorine in a chemical, the more toxic it is in most general cases.
o Chlorination is the key process in how these chemicals become more toxic and what
affects their chemical properties in the environment. In addition, they affect the
solubility of chemical (e.g. more chlorine equals higher solubility in fats).
o These chemicals are very persistent and hard to remove: persistent organic p