Tablas de NMP Agua Potable Tomado de: Fuente: STANDARD METHODS 9221 B. STANDARD TOTAL COLIFORM FERMENTATION TECHNIQUE , JUNE 2003

1. TABLAS DE NMP PARA AGUA POTABLE
9221 C. ESTIMACIÓN DE LA DENSIDAD BACTERIANA
TABLA 9221: II MPN Index and 95% Confidence Limits for All Combinations of Positive and
Negative Result when five 20 ml portions are used.
No. Of tubes giving MPN Index/100ml 95% Confidence Limits
positive reaction out (Exact)
of 5 (20 ml each) Lower Uper
0 <1.1 - 3.5
1 1.1 0.051 5.4
2 2.6 0.40 8.4
3 4.6 1.0 13
4 8.0 2.1 23
5 >8.0 3.4 -
TABLA 9221: II MPN Index and 95% Confidence Limits for All Combinations of Positive and
Negative Result when ten 10 ml portions are used.
No. Of tubes giving MPN Index/100ml 95% Confidence Limits
positive reaction out (Exact)
of 10 (10 ml each) Lower Uper
0 <1.1 - 3.4
1 1.1 0.051 5.9
2 2.2 0.37 8.2
3 3.6 0.91 9.7
4 5.1 1.6 13
5 6.9 2.5 15
6 9.2 3.3 19
7 12 4.8 24
8 16 5.8 34
9 23 8.1 53
10 >23 13 -
Fuente: STANDARD METHODS 9221 B. STANDARD TOTAL COLIFORM FERMENTATION TECHNIQUE , JUNE
2003