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Term Definition Article Siehe auch
bioaccumulation:
Wikipedia: bioaccumulation
Accumulation of chemicals by an organism by direct uptake from the surrounding medium or through the food chain.
bioconcentration: Accumulation of chemical substances in an organism by direct uptake from the surrounding medium without taking the food chain into account. bioaccumulation
bioconcentration factor:
Wikipedia: bioconcentration factor
The concentration of the substance in a test organism (usually a fish) in [g/kg] divided by the substance concentration in the water medium [g/L]. May also be determined from dividing the rate of uptake by the rate of elimination.
Biodegradation rate (prediction): Probability of fast biodegradation according to a linear and non-linear model (Howard et al., Environ. Toxicol. Chem. 11: 593-603, 1992).
biological degradation potential:
Wikipedia: biological degradation potential
The ability of organisms to degrade dissolved organic chemical substances. Degradation may produce stable intermediates or lead to complete mineralization (complete degradation). persistence
BOD value:
Wikipedia: BOD value
Biological Oxygen Demand (BOD) is a measure of the rate of use of oxygen by water borne microorganisms in removing organic compounds dissolved in the water. Thus it is a measure of the quality of a body of water. It is defined as the amount of oxygen that is used by microorganisms to oxidatively degrade dissolved organic substances at 20 C, e.g. during 5 days (BOD5 value). The BOD value is determined in closed bottles that contain a solution of the substance in water together with microorganisms. The oxygen concentration is measured at the beginning and at the end of the test.
boiling point:
Wikipedia: boiling point
Temperature at which the vapor pressure of a fluid equals the outside pressure. Usually given at normal pressure. melting point
by-product:
Wikipedia: by-product
Chemical synthesis produces unwanted by-products in addition to the desired final product, often in the range of some percent of the final product. We limit this term according to the EC guideline for chemical preparations to substances that are present in the product above 1 % before purification. By using optimal reaction conditions by-products can often be avoided. dangerous trace impurity
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