ASTM D4387-84(1997)

1.1 This guide covers selecting grab sampling devices for collecting benthic macroinvertebrates. (See Table 1)

1.2 The grab sampler when used correctly is a quantitative collecting device. It is designed to penetrate and grab or scoop a variety of substrates or sediment types from which macroinvertebrates are collected in freshwater, estuarine, and marine habitats.