Chemical Element: A fundamental substance comprising one kind of atom; the simplest form of matter.
Chemical Oxygen Demand (COD): A measure of the oxygen required to oxidize all compounds, both organic and inorganic, in water.
Chemical elements which are involved in the construction of living tissue and which are needed by both plant and animal.
A chemical element necessary in large amounts, usually greater than 1 ppm in the plant, for the growth of plants and usually applied artificially in fertilizer or liming materials.
The gaseous chemical element with symbol O that is essential in the respiratory processes of most living cells and in combustion processes. It's the most abundant element in The Earth's crust. Nearly one fifth of the air's volume is made of oxygen.
Carbon: A chemical element that is essential to all living things. Carbon combines with other elements to form a variety of different compounds. Plants and animals are made up of carbon compounds, and so are certain minerals.
trace elements Chemical elements appearing in minute quantities in natural systems or media; may occasionally be concentrated by specific organisms. Nutrients, such as phosphorous, though in minute quantities are not usually called trace elements.
The lightest of the chemical elements, it forms organic compounds with carbon. The amount of dissolved hydrogen in groundwater can also indicate the redox state and pH of the local environment.
Hydrogen Sulfide (HS) ...
Biogeochemical cycling The movement of chemical elements between organisms and non-living compartments of atmosphere, lithosphere and hydrosphere. Biogeography The study of the geographical distribution of organisms.
transient tracers Chemical elements (often radioactive) or compounds that have finite lifetimes. Atmospheric testing of nuclear weapons from the mid-1950s to the early 1960s released large quantities of radionuclides to the atmosphere.
Carbon - An abundant chemical element on Earth. As the basis for all living things, carbon is present in particular abundance in a solid and a liquid form in trees, other plants, and soils, and in various forms in all fossil fuels, ...
Nutrients - Nutrients are chemical elements and compounds found in the environment that plants and animals need to grow and survive. For water-quality investigations the various forms of nitrogen and phosphorus are the nutrients of interest.
The number of protons determines the total positive charge, or atomic number, which in turn determines the chemical element that a given atom represents.
atom. The smallest unit of a chemical element; composed of
protons, neutrons and electrons.
available chlorine. A measure of the amount of chlorine ...
Means by which something may be followed; for example a radioactive isotope may replace a stable chemical element in a toxic compound enabling the toxicokinetics to be followed.
Halogen: One of the chemical elements chlorine, bromine, or iodine.
Halogen - a family of chemical elements that includes fluorine, chlorine, bromine, and iodine ...
Redox Potential: a measurement of the oxidized vs. reduced chemical elements of the soil; the more negative the potential, the more reducing the soil conditions ...
Mineral is a naturally occurring chemical element or compound possessing a definite crystalline structure
Monoculture is the cultivation of vast tracts of land under one crop.
A general term referring to all known isotopes, both stable (~279) and unstable (~5000), of the chemical elements.
O
top
Occupational Dose ...
The nucleus contains positively charged protons and neutral neutrons, whereas the electron cloud is made up of negatively charged electrons. The number of protons (Z) determines the chemical element and the number of neutrons determines the isotope ...
 See also: Water, Waste, Condition, Environment, Air
  
|
RSS
