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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 10.0 1000 N/A
Resistivity megohms/cm 10.00 1.0 1.0 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 1.0 1.0 5.0
Micromhos/cm        
Minimum Resistivity 16.66 1.0 1.0 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 10.0 1 0.1
Copper* 0.002 0.01 0.1 1.0
Chloride* 0.020 0.20 2.0 20.0
Dissolved gases* 0.010 0.10 0.5 0.5
Potassium* 0.001 0.01 0.1 1.0
SiO2 (total)* 0.001 0.01 0.1 1.0
Sodium* 0.001 0.01 0.1 1.0
Total solids* 0.050 0.50 5.0 50.0
Fixed solids (inorganic)* 0.010 0.10 1.0 10.0
Volatile solids (organic)* 0.04 0.40 4.0 40.0
Zinc* 0.001 0.01 0.1 1.0
Note:*mg/l        
Particle count (>1 micron), Maximum/ml 2 10 100 500
Micro-organisms, Maximum/100ml 1 10 100 100
Total organic carbon* 0.075 0.50 1.0 2.0
Note:*mg/l        

 

(USP) United States Pharmacopoeia XXI Standards

Type

USP Purified Water for Injection
Chloride, mg/l 2.0 2.0
Total solids, mg/l 10 10
Micro-organisms, maximum per 100 ml -- --
PH 5.-7. 5.-7.
Sulfates, mg/l as SO4 5.0 4.0
Ammonia, mg/l as NH3 0.3 0.3
Calcium, mg/l 4.0 4.0
CO2 mg/l @ 25°C 5.0 5.0
Heavy Metals, mg/l as Cu 1.0 1.0
Oxidizable substances as O2 0.8 0.8
Pyrogens Test -- Absent by Rabbit

 

 
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