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Persistent organic wastes are organic compounds that are poorly degraded and thus accumulate in the environment. The most significant contaminants threaten human health and the environment through toxic effects.

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a drug formerly used as a sedative, but withdrawn in the early 1960s after it was found to cause congenital malformation or absence of limbs in children whose mothers took the drug during early pregnancy.

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a liquid that has been diluted.

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Just as per cent means out of a hundred, so parts per million or ppm means out of a million. Usually describes the concentration of something in water or soil. One ppm is equivalent to 1 milligram of something per liter of water (mg/l) or 1 milligram of something per kilogram soil (mg/kg).

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Lethal dose (LD50) is the amount of an ingested substance that kills 50 percent of a test sample. It is expressed in mg/kg, or milligrams of substance per kilogram of body weight. Common name. Toxin. Lethal doses.

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Pollution is the introduction of contaminants into the natural environment that cause adverse change.Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.

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a substance that pollutes something, especially water or the atmosphere.

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an apparatus using water or a solution for purifying gases or vapors.

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a device incorporated in the exhaust system of a motor vehicle, containing a catalyst for converting pollutant gases into less harmful ones.

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reat (soil or water) with lime to reduce acidity and improve fertility or oxygen levels.

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In chemistry, neutralization or neutralisation (see spelling differences), is a chemical reaction in which an acid and abase react quantitatively with each other. In a reaction in water,neutralization results in there being no excess of hydrogen or hydroxide ions present in solution.

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a substance that pollutes something, especially water or the atmosphere

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Any form of precipitation, including rain, snow, hail, fog, or dew, that is high in acidpollutants, especially sulfuric and nitric acid. Acid precipitation has a pH of less than 5.6 (the normal acidity of unpolluted atmospheric water) and is often less than pH 5.0. Also called acid rain.

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The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic.

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a thing, especially a trend or fact, that indicates the state or level of something.

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In chemistry, bases are substances that, in aqueous solution, are slippery to the touch, taste astringent, change the color of indicators (e.g., turn red litmus paper blue), react with acids to form salts, promote certain chemical reactions (base catalysis), accept protons from any proton donor, and/or contain ...

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An acid is a molecule or ion capable of donating a hydron (proton or hydrogen ion H⁺), or, alternatively, capable of forming a covalent bond with an electron pair (a Lewis acid). The first category of acids is the proton donors or Brønsted acids.

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a synthetic organic compound used as an insecticide. Like other chlorinated aromatic hydrocarbons, DDT tends to persist in the environment and become concentrated in animals at the head of the food chain. Its use is now banned in many countries.

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a chemical that destroys fungus.

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An insecticide is a substance used to kill insects. They include ovicides and larvicides used against insect eggs and larvae, respectively. Insecticides are used in agriculture, medicine, industry and by consumers.

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substance that is toxic to plants and is used to destroy unwanted vegetation

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Pesticides are the only toxic substances released intentionally into our environment to kill living things. This includes substances that kill weeds (herbicides), insects (insecticides), fungus (fungicides), rodents (rodenticides), and others.

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a substance or layer that underlies something, or on which some process occurs, in particular.

the surface or material on or from which an organism lives, grows, or obtains its nourishment.

the substance on which an enzyme acts.

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any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents. They include many natural oils, waxes, and steroids.

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This is a private site with access restricted to its members.

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any of a large group of organic compounds occurring in foods and living tissues and including sugars, starch, and cellulose. They contain hydrogen and oxygen in the same ratio as water and typically can be broken down to release energy in the animal body.

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a substance that provides nourishment essential for growth and the maintenance of life.