MPN Table

COLIPLATE™- 400

INTENDED USE The ColiPlate™-400 is a rapid, convenient and accurate test for quantitative measure of total coliforms and E. coli. The test is designed to meet regulatory guidelines for surface water, recreational water, processing water and wastewater. The ColiPlate enables quantification of coliforms and E. coli density ranging between ca. 3 to 2,400 cfu/ 100 ml in a single test unit without dilution. The distinctive blue/green coloration of positive tested samples enables analysis of brownish, turbid or rust filled waters.

TEST PRINCIPLE AND FEATURES The ColiPlate test utilizes the proven X-Gal and MUG techniques to detect viable coliforms and/or E. coli bacteria. The ColiPlate contains selective media to provide nutrients to stimulate the growth of coliforms and E. coli. The media also contains inducers and chromogenic/fluorogenic substrates. These substrates react with specific enzyme indicative of coliforms (beta-D-galactosidase) and E. coli (beta-D-glucoronidase) to provide color change to blue/green and fluorescence by coliforms and E. coli respectively. Test results are recorded after just 24 hours of incubation with the appearance of blue/green color for coliforms. E. coli can be detected by the appearance of fluorescence under a long wavelength UV light. Quantification is based on Most Probable Number (MPN) of colony forming-units (cfu) per 100 ml sample.

BASED ON – DIRECT POUR METHOD

No. Wells Giving Positive
Reaction
MPN per 100 ml SampleNo. Wells Giving Positive
Reaction
MPN per
100 ml Sample
No. Wells Giving Positive ReactionMPN per
100 ml Sample
No. Wells Giving Positive
Reaction
MPN per
100 ml Sample
0<3
1325764918273388
2526795018874403
3827835119475418
41128875220076434
51329905320677451
61630945421378469
71931985521979489
822321025622680510
925331065723381534
1028341105824082559
1130351145924783587
1233361196025584619
1336371236126385654
1439381276227186694
1543391326328087740
1646401366428988794
1749411416529889858
1852421466630790938
19554315167317911,038
20594415668328921,174
21624516169339931,370
22654616670350941,696
23694717171362952,424
2472481777237596>2,424