High Purity Water Standards

High Purity Water Standards

Because of varying conditions, information is to be used as a guideline only.

Laboratory Water Requirement Standards

(ACS) American Chemical Society
Specific resistance.....Not less than 0.5 megohm/cm
Silicate (as SiO2)...............Not more than 0.01 ppm
Heavy metals (e.g. Pb).......Not more than 0.01 ppm
 
(NCCLS) National Committee for Clinical Laboratory Standards
Characteristics Type I Type IIA Type IIB Type III
CFU/ml <10.00 10 1000 N/A
Resistivity megohms/cm 10 1 1 0.1
Particulate matter 0.22 N/A N/A N/A
Organics Act. Carbon N/A N/A N/A
(ASTM) American Society for Testing and Materials
Laboratory Grade Water
Type Type I Type II Type III Type IV
Max. Conductivity 0.06 1 1 5
Micromhos/cm        
Minimum Resistivity 16.66 1 1 0.2
Megohm/cm        
PH -- -- 6.2-7.5 5.-8.
Electronic Grade Water
Type E-I E-II E-III E-IV
Resistivity, minimum, Megohm @ 25°C 17 10 1 0.1
Copper* 0.002 0.01 0.1 1
Chloride* 0.02 0.2 2 20
Dissolved gases* 0.01 0.1 0.5 0.5
Potassium* 0.001 0.01 0.1 1
SiO2 (total)* 0.001 0.01 0.1 1
Sodium* 0.001 0.01 0.1 1
Total solids* 0.05 0.5 5 50
Fixed solids (inorganic)* 0.01 0.1 1 10
Volatile solids (organic)* 0.04 0.4 4 40
Zinc* 0.001 0.01 0.1 1
Particle count (>1 micron), Maximum/ml 2 10 100 500
Micro-organisms, Maximum/100ml 1 10 100 100
Total organic carbon* 0.075 0.5 1 2
Note:*mg/l        
(USP) United States Pharmacopoeia XXI Standards
Type USP Purified Water for Injection
Chloride, mg/l 2 2
Total solids, mg/l 10 10
Micro-organisms, maximum per 100 ml -- --
PH 5.-7. 5.-7.
Sulfates, mg/l as SO4 5 4
Ammonia, mg/l as NH3 0.3 0.3
Calcium, mg/l 4 4
CO2 mg/l @ 25°C 5 5
Heavy Metals, mg/l as Cu 1 1
Oxidizable substances as O2 0.8 0.8
Pyrogens Test -- Absent by Rabbit