grab sample

English - English

Definition of grab sample in English English dictionary: A single sample collected at a particular time and place that represents the composition of the water, air, or soil only at that time and place; A sample taken at random, generally not expected to be representative to any reliable degree of precision; a single sample or measurement taken at a specific time or over as short a period as feasible; A quick air sample used to check types and levels of pollutants Normally not used to determine whether violation of a health standard has taken place; A sample taken at random; it is assayed to determine if valuable elements are contained in the rock A grab sample is not intended to be representative of the deposit, and usually the best-looking material is selected; a single sample which is collected at one point in time and place; A single sample of soil or of water taken without regard to time or flow; A single water or wastewater sample taken at a time and place representative of total discharge; A single sample collected at a particular time and place which represents the composition of the water only at that time and place; A sample of media taken from a single source, the opposite of a composite sample; A sample collected from one to three points in a stream using a Van Dorn sampler; A single sample collected at a particular time and place that represents the composition of the water only at that time and place; A single sample taken at a given place and time, (see composite sample); A single sample collected at a particular time and place that represents the composition of the media only at that time and place; – A soil sample obtained without using a coring device Frequently used during tank removals; A sample that is randomly collected or "grabbed" from the collection site; a single sample of wastewater taken at neither set time nor flow; A sample collected at a specific time and specific location, used to determine the nature of the water for that specific time and location only; Typically, a single water or air sample drawn over a short time period As a result, the sample is not representative of long-term conditions at the sampling site This type of sampling yields data that provides a snapshot of conditions or concentrations at a particular point in time ADVANCE \x 540