12.0 REAGENT GRADE WATER
C A P
A S T M
N C C L S
Type
I
Type
II
Type
III
Type
I
Type
II
Type
III
Type
IV
Type
I
Type
II
Type
III
Specific Conductance
(micromho/cm., max)
0.1
0.5
10
0.06
1.0
0.25
5.0
0.1
0.5
10
Specific Resistance
(megohms-cm, min)
10
2.0
0.1
18.0
1.0
4.0
0.2
10
2.0
0.1
pH @ 25_ C (*)
*
*
5.0
8.0
*
*
*
*
5.0
8.0
*
*
5.0
8.0
Silicate, Soluble
(Ig/L, max)
50
100
1000
3.0
3.0
500
N.L.
50
100
1000
Culture/Colony Count
cfu/mL (**)
10
10^3
**
**
**
**
10
10^3
Total Organic Carbon
(TOC), max, Ig/L
100
50
200
N.L.
Sodium, max, Ig/L
1.0
5.0
10
50
Chlorides, max, Ig/L
1.0
5.0
10
50
Note: CAP
=
College of American Pathologists
ASTM
=
American Society for Testing and Materials
NCCLS
=
National Committee for Clinical Laboratory Standards
EU
=
Endotoxin Units
N.L.
=
No Limit
*
:
The measurements of pH in Type I, Type II and Type III reagent water is meaningless and has been eliminated from the
procedure, since the electrodes used in this test contaminate the water.
**
:
When bacteria levels need to be controlled, reagent grade types should be further classified as follows:
Microbiological contamination: Max heterotrophic bacteria count Type-A 10/1000 mL, 0.03 EU, Type-B 10/100 mL, 0.25
EU, Type-C 100/10 mL.
References
:
CAP Reagent Water Specifications, 1985, pg 5, 11.
NCCLS Document C3-A2, Vol. 11, No. 13, Pg 8.
Annual Book of ASTM Standards, 1992, Vol. 11.01, D1193-91, Pg 45.