Identification of the chemicals of study that were considered hazardous
Identification of the chemicals of study that were considered hazardous and they included the following chemicals; PCBs, chromium waste, Acrynalide and Toluene diisocynate. The samples of the chemicals were taken from the site and its effects determined to include exposure to cancer, weakening of the immune system, damage of the reproductive system and hindrance to photolysis in plants.
An assessment of the exposure of human beings on the site revealed that people who just started eating fish from the river downstream were exposed to a high content of PCBs. The PCBs are absorbed by the body of fish and accumulated by plants that are irrigated downstream. Hence exposure to it arises when the fish or plants is consumed. Chromium is most likely taken into the body through foods that are irrigated by water downstream and also by consumption of the water. Human beings are exposed to acrylamide through the irrigated foods downstream and the harmful product is formed when food is cooked. Toluene diisocyanate is exposed by its ability to alter the pH of water thereby forming inert ureas which alters the process of photolysis.
PCBs exist in the environment as a combination of congeners but totally different from commercial mixtures. Over time, its composition changes by transformation of chemical components and partitioning. An assessment of the dose response of cancer is done with full consideration of the toxic levels and the activities of human population in the environment. In order to determine the effects of chromium waste, samples of urine are taken from people living near the dump site and compared to people living far from dump sites. The results show that, people living near the dump sites have high levels of chromium, nearly seventy five percent more than those living far away. For Acrylamide, its dose response effects are assessed using rats. Rats exposed to high doses of acrylamide and are observed to have swelled thyroid glands and growth of tumors in its body parts.
Lastly, risk characterization would involve evaluating the hazards of the chemicals found in the site, their exposure response and coming up with necessary remedies for the site
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