Chemical Water Pollution

Chemical form of water pollution includes the presence of a wide range of chemicals from industry, such as lead, arsenic, nitrates, radioactive substances, metals and solvents, and even chemicals which are formed from the breakdown of natural wastes (ammonia, for instance). Effluents from chemical industries and oil pollution from accidental crude spillage are categorized under chemical form of water pollution. In aquatic systems, these chemicals are poisonous to fish and other aquatic life. Chemical pollutants can be generally categorized into persistent (degrade slowly) and nonpersistent (degradable) substances.

Nonpersistent pollutants include domestic wastes, fertilizers, and some classes of industrial wastes. These polluting substances can be broken down into simple nonpolluting molecules or compounds such as carbon dioxide, and nitrogen by chemical or biological processes. Persistent water pollution is the most rapidly growing type of pollution, and includes polluting substances that degrade or do not grade or cannot be broken down at all. These pollutants tend to remain in aquatic environments for a long period of time. Common persistent chemical pollutants include some pesticides (such as dieldrin, heptachlor, and DDT), petroleum products, polychlorinated biphenyls (PCBs), chlorophenols, dioxins, polycyclic aromatic hydrocarbons (PAHs), radionuclides, and heavy metals. Toxic metals discharged in effluent can be accumulated in seafood, especially fish and shellfish such as prawns, cockles, mussels, and oysters, to levels in excess of public health limiting levels, therefore posing serious health concerns to people who eat them.

Pesticides used in agriculture and around the home, especially those used for controlling insects (insecticides) and weeds (herbicides), are another type of toxic chemical. These chemicals are used to kill unwanted animals and plants, and may be collected by rainwater runoff and carried into streams, lakes, bays, rivers, and seas, especially if these substances are applied in excessive quantities. Some of these chemicals are biodegradable and may quickly decay into harmless or less harmful forms, while others are nonbiodegradable and can persist in the environment for a long time. When animals consume plants that have been treated with certain nonbiodegradable toxicants (NBTs), such as dichlorodiphenyltrichloroethane (DDT) and chlordane, these chemicals are absorbed into the tissues or organs of the animals and can accumulate over time. When other animals feed on these contaminated animals, the chemicals are passed up the food chain. Some of these can accumulate in fish and shellfish and poison people, animals, and birds that eat them. Materials like detergents and oils float and spoil the appearance of a water body, as well as being toxic; and many chemical pollutants have unpleasant odors.

Healthy Chemistry For Optimal Health

Healthy Chemistry For Optimal Health

Thousands Have Used Chemicals To Improve Their Medical Condition. This Book Is one Of The Most Valuable Resources In The World When It Comes To Chemicals. Not All Chemicals Are Harmful For Your Body – Find Out Those That Helps To Maintain Your Health.

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