A ___ is a single-volume sample collected at one time from one place.

A ___ is a single-volume sample collected at one time from one place.

• A. Composite sample
• B. Grab sample
• C. Bulk sample
• D. Batch sample

Answer: (B)

A grab sample is defined as a single-volume sample collected at one time from one place. This type of sampling is typically used when immediate, specific analysis is needed, allowing for the examination of the water quality at a particular moment without the need for averaging results over time or from multiple locations. In the context of water treatment, this kind of sampling is often employed for preliminary testing or to check for specific contaminants that may be present at that single moment. For example, a grab sample may be taken from a water source to assess immediate conditions following a rainfall event or another environmental change. Other sampling methods, such as composite, bulk, or batch samples, involve different collection techniques or purposes that do not meet the criteria of being a single-volume, time-specific sample from a single location. Composite samples combine multiple grab samples taken over time or from different locations to provide an average representation of a situation, while bulk samples refer to larger quantities collected for testing or processing. Batch samples suggest a collection of materials processed in a single lot, usually over a period, rather than at a single point in time.

A grab sample is defined as a single-volume sample collected at one time from one place. This type of sampling is typically used when immediate, specific analysis is needed, allowing for the examination of the water quality at a particular moment without the need for averaging results over time or from multiple locations.

In the context of water treatment, this kind of sampling is often employed for preliminary testing or to check for specific contaminants that may be present at that single moment. For example, a grab sample may be taken from a water source to assess immediate conditions following a rainfall event or another environmental change.

Other sampling methods, such as composite, bulk, or batch samples, involve different collection techniques or purposes that do not meet the criteria of being a single-volume, time-specific sample from a single location. Composite samples combine multiple grab samples taken over time or from different locations to provide an average representation of a situation, while bulk samples refer to larger quantities collected for testing or processing. Batch samples suggest a collection of materials processed in a single lot, usually over a period, rather than at a single point in time.