a single sample of wastewater taken at neither set time nor flow.
Monitoring technique for airborne containments which gives a ‘point of time` measure of the level of contamination at a selected place.
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 single sample of wastewater taken at neither set time nor flow.
Sample of rock or material grabbed at random to be analyzed.
Sample of greasy wool taken at random positions from every bale in a sale lot.
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. 
noun a single sample or measurement taken at a specific time or over as short a period as feasible
A sample from a rock outcrop that is assayed to determine if valuable elements are contained in the rock. A grab sample will not provide a representative picture of the value of a deposit, only an indication.
A sample from a rock outcrop that is assayed to determine if valuable elements are contained in the rock. A grab sample will not provide a representative picture of the value of a deposit, only an indication.
A sample from a rock outcrop that 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.