MPB – Modified Postgate’s B Media

Contains white suspended solids that will settle to the bottom.

The NACE standard (TMO 194-2004) media used for the detection of Sulfate Reducing Bacteria (SRB). This media is made under strict anaerobic conditions inside an anaerobic chamber. As Sulfate Reducing Bacteria grow and metabolize in the media, they will reduce sulfate to sulfide. This sulfide then binds with the dissolved iron in the MPB media creating a black precipitate (Iron Sulfide). This black precipitate indicates that the vial is positive for SRB.

False Positive: If the sample fluid injected into the vial contains a significant concentration of dissolved sulfide, the first one to two vials in the dilution series may turn black. Vials should be recorded as false positives if immediately, or within an hour, these vials develop a black precipitate.

Physical Characteristics: This anaerobic media is white and opaque in color with a white precipitate which settles to the bottom of the vial.