MUC

Maximum use concentration - the maximum air-borne contaminant concentration that a particular respirator may be used for protection against.

Related Terms

EMISSION SPECTROMETER

Works on the basis that atoms of metallic and other particular elements emit light at characteristic wavelengths when they are excited in a flame, arc, or spark. Excited light is directed through an entrance slit in the spectrometer. This light penetrates the slit, falls on a grate, and is dispersed and reflected. The spectrometer is calibrated by a series of standard samples containing known amounts of the elements of interest. By exciting these standard samples, an analytical curve can be established which gives the relationship between the light intensity and its concentration in the fluid.

SALINITY

A measure of the concentration of dissolved mineral substances in water.

ADSORPTION

Adhesion of the molecules of gases, liquids, or dissolved substances to a solid surface, resulting in relatively high concentration of the molecules at the place of contact; e.g. the plating out of an anti-wear additive on metal surfaces.

ACIDIC

The reaction of a substance with water resulting in an increase in concentration of hydrogen ions in solution (see acid).

ATOMIC ABSORPTION SPECTROSCOPY

Measures the radiation absorbed by chemically unbound atoms by analyzing the transmitted energy relative to the incident energy at each frequency. The procedure consists of diluting the fluid sample with methyl isobutyl ketone (MIBK) and directly aspirating the solution. The actual process of atomization involves reducing the solution to a fine spray, dissolving it, and finally vaporizing it with a flame. The vaporization of the metal particles depends upon their time in the flame, the flame temperature, and the composition of the flame gas. The spectrum occurs because atoms in the vapor state can absorb radiation at certain well-defined characteristic wave lengths. The wave length bands absorbed are very narrow and differ for each element. In addition, the absorption of radiant energy by electronic transitions from ground to excited state is essentially and absolute measure of the number of atoms in the flame and is, therefore, the concentration of the element in a sample.

HABITAT SANCTUARY

A marine sanctuary established for the preservation, protection and management of essential or specialized habitats representative of important marine systems.

MISCIBLE

Capable of being mixed in any concentration without separation of phases; e.g., water and ethyl alcohol are miscible.

SLURRY

A water containing high concentration of suspended solids, usually over 5000 mg/L.

SPECTROGRAPHIC ANALYSIS

Determines the concentration of elements represented in the entrained fluid contaminant.

ICE MASSIF

A concentration of sea ice covering an area of hundreds of kilometers, which is found in the same region every summer

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