|
Proposed
Water Specifications
Proposed
Guidelines
National Committee for Clinical Laboratory Standards (NCCLS)
|
Type
I |
Type
II |
Type
IIB |
Type
III |
Bacterial
content, colony forming
units per mL, cfu/ml (Maximum) |
10 |
10 |
102 |
N.A. |
| pH |
N.A. |
N.A. |
N.A. |
N.A. |
Resistivity,
megohm centimeter
(M_ - cm), 25°C |
10
(in-line) |
1.0 |
1.0 |
0.1 |
| Silicante
mg/liter SiO2 (Maximum) |
0.05 |
0.1 |
0.1 |
1.0 |
| Particulate
matter |
0.22
um filter |
N.A. |
N.A. |
N.A. |
| Organics |
Activated
Carbon |
N.A. |
N.A. |
N.A. |
College
of American Pathologists (CAP)
WATER
GRADE
|
Microbial
Content (cfu/ml, max.) |
|
Type
I |
Type
II |
Type
III |
Specification
Resistivity -
Specific Resistance
(megohms @25EC) |
a.
in line |
10 |
N.A. |
N.A. |
| b.
Effluent (As Used) |
N.A. |
2.0 |
0.1 |
| Silicate
(mg/liter SiO2) |
0.05 |
0.10 |
1.00 |
| pH |
N.A. |
N.A. |
5.0
- 8.0 |
| Microbial
Content (cfu/ml, max.) |
10 |
104 |
N.A. |
Notes:
| 1. |
Particulate
Matter - Type I water should be "free" of particulate matter
larger than 0.2 microns. "Free of particulate matter" is defined
as less than 500 particles/liter which are greater than 0.2
ohms. |
| 2. |
Other
parameters, such as particle size, heavy metals and/or trace
elements, and carbon dioxide content should be considered and
monitored when appropriate for special or specific uses. |
| 3. |
Organics
and other contaminants may be reduced with the use of activated
carbon. |
American Society for Testing Materials
(ASTM)
|
Type
I |
Type
II |
Type
III |
Type
IV |
| Total
Matter, max. mg/liter |
0.1 |
0.1 |
1.0 |
2.0 |
| Electrical
conductivity, max. umho/cm at 298 K (25EC) |
0.06 |
1.0 |
1.0 |
5.0 |
| Electrical
Resistivity, min. M/cm at 298 K (25EC) |
16.67 |
1.0 |
1.0 |
0.2 |
| pH
at 298 K (25EC) |
* |
* |
6.2
- 7.5 |
5.0
- 8.0 |
| Min.
color retention time of potassium permanganate, minutes 60 |
60 |
60 |
10 |
10 |
| Max.
soluble silica |
Not
detectable |
Not
detectable |
10
ug/liter |
No
limit |
Microbiological
Classification**
* The
measurements of pH in Type I and Type II reagent waters are meaningless
and have been eliminated from the procedure, since electrodes used
in this test contaminate the water.
** When the bacterial levels need to be controlled, reagent grade
types should be further classified as follows:
|
Type
A |
Type
B |
Type
C |
| Max.
total bacteria count |
0/ml |
10/ml |
100/ml |
WATER
TREATMENT APPLICATION DATA
|
REAGENT GRADE WATER TABLES