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These toxic materials can cause all kinds of bad effects including nausea, diarrhea, vomiting and even cancer. If you keep eating and drinking contaminated food and water, these toxins can build up in your body. If you eat animals that have been contaminated, you're getting a double dose of toxins. What's even worse, your body can't properly process some of these metals and so they might take years to get out of your system.

Overview on management of Hazardous Waste in Singapore

List of controlled Toxic Industrial Waste

United Nations Statistics Division

Patin says the composition of drilling fluids is so variable and the circumstances of their use so different that there is "an extremely wide range of concentrations that cause different toxic effects" ranging from "practical absence of toxic effects to lethal toxicity". He divides drilling fluid components into three main groups, based on their eco-toxicological hazard:

Environmental disasters - Lenntech - Water Treatment …

Patin says water-based drilling muds, while preferred over OBMs or SBMs for obvious environmental reasons, can still damage marine life. Leaving aside the question of toxicity, WBMs deposited on seabed sediments may smother benthic animals and, if in the form of very fine particles suspended in the water, can interfere with respiration in small marine animals and pelagic fish:

Toxicity is the degree to which a chemical substance or a particular mixture of substances can damage an organism. Toxicity can refer to the effect on a whole organism, such as an animal, bacterium, or plant, as well as the effect on a substructure of the organism, such as a cell (cytotoxicity) or an organ such as the liver …

Ozone is a natural gas composed of three atoms of oxygen

This continued until the 1970s, with dumping at sea the accepted practise for disposal of nearly everything, including toxic material such as pesticides, chemical weapons, and radioactive waste.
Dumping of the most toxic materials was banned by the London Dumping Convention in 1972, and an amended treaty in 1996 (the London Convention) further restricted what could be dumped at sea.

It is blue in color and has a strong odor

However, there are still the problems of already-dumped toxic material, and even the disposal of permitted substances at sea can be a substantial environmental hazard.

Chemicals also enter the sea from land-based activities.

The National Environment Agency. Overview on management of Hazardous Waste in Singapore. List of controlled Toxic Industrial Waste

Environmental Effects of Drilling Waste Discharges

Summarising various toxicological studies on the effects of the components of water-based drilling fluids, Patin supports the view that barite (barium sulphate) has "no observed effects" at concentrations of less than 2mg/l in standard chronic tests.

DTSC: Who We Are and What We Do

Produced, ballast and injection waters, as well as drilling cuttings and fluids polluted by hundreds of different chemicals, often go directly overboard at the production site. The majority of available studies of liquid and solid wastes of the offshore oil and gas industry give very different estimates of their toxicities. They are difficult to compare, due to the variability of the chemical composition of these discharges. (p.255.)

Putting Garbage to Good Use with Waste-to-Energy

You can encourage manufacturers by choosing to buy more energy-efficient and less hazardous electronics and by supporting companies that make protecting the environment a priority. You can also do your own part to reduce by not being wasteful and disposing of your electronics safely and properly.