1 . in the mpn - griess method of enumeration of nitrite - oxidizing bacteria , the nitrite concentration deeply effect the enumeration results and detection time . the o . lmmol / l nitrite concentration in the culture is the best choice for mpn - griess method and the shortest detection time is 4 week 硝酸細(xì)菌mpn ? griess計(jì)數(shù)法所用培養(yǎng)基的亞硝酸鹽濃度對(duì)計(jì)數(shù)的周期和結(jié)果均有影響,采用0 . 1mmol l亞硝酸鹽的培養(yǎng)基,進(jìn)行4周的計(jì)數(shù)培養(yǎng),是最優(yōu)的硝酸細(xì)菌mpn ? griess計(jì)數(shù)法。