Modification of the 14C most-probable-number method for use with nonpolar and volatile substrates

A method was developed to allow the use of volatile and nonpolar substrates in 14C most-probable-number tests. Naphthalene or hexadecane was sorbed to filter paper disks and submerged in minimal medium. The procedure reduced the volatilization of the substrates while allowing them to remain available for microbial degradation.