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Contaminated and Hazardous Waste Site Management

Glossary N



Narrative (SDG narrative): Portion of the data package which includes laboratory, contract,

Case, and sample number identification, and descriptive documentation of any problems encountered in processing the samples, along with corrective action taken and problem resolution.

Narrow Bore Capillary Column: A gas chromatographic column with an internal diameter (ID) that is smaller than 0.32 mm. Columns with greater diameters are classified as wide bore capillaries.

Neutron Scattering: Change in neutron direction as a result of collisions with nuclei in a material.

Neutron Thermalization: See Neutron Scattering,

Noise: Any unwanted signal; a disturbance that is not part of signal from a specified source. In electrical or induced polarization (IP) surveys, noise may result from interference of power lines, motor-generators, atmospheric electrical discharges, etc. See Cultural Noise.

Non-Aqueous-Phase-Liquid (NAPL): Elements or compounds in the liquid phase other than water. This phase is immiscible in water. Examples include petroleum hydrocarbons, like gasoline, and solvents such as trichloroethylene.

Nonlinear System: A mathematical system or process is nonlinear if there are at least two unknown quantities which are dependent on each other. Density- dependent transport and reactive geochemical transport are common examples. These systems require more computational effort to solve compared to linear systems.

Non-Unique: In geophysical interpretation and mathematical modelling, a problem for which two or more subsurface models satisfy the data equally well.

Nutrients: Elements (e.g., nitrogen and phosphorus) and trace elements (including sulfur, potassium, calcium, and magnesium) that are essential for the growth of organisms.

 

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