ASTM D4200 – Standard Test Method for Evaluating Inhibitory Effects of Ink Grids on Membrane Filters
Description:
Significance and Use
5.1 This test method may be applied to determine the suitability of grid-marked membrane filters for use in bacteriological culture techniques for the detection and enumeration of bacterial organisms.
5.2 A particularly sensitive organism and growth conditions have been selected for this test method in order to maximize sensitivity to toxic materials possibly present in the inks used for grid-marking membrane filters.
Scope
1.1 This test method describes a procedure whereby the user of ink-gridded membrane filters in water quality studies can ascertain whether or not the grid lines are toxic and inhibitory to bacterial growth when the membrane and its entrapped bacteria are incubated on a suitable media.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
ASTM D4193