AOAC Test Method 973.41

Method information displayed is provided for informational purposes only.
ALS - Columbia may or may not offer methods shown. Please contact us to learn about ALS - Columbia's latest available methods. No warranty (express or implied) is made as to the website accuracy, completeness, or applicability (such as the age of a method and whether or not it applies to your project).

Source:
AOAC

Method Name:
pH of Water. Official Name: pH of Water

Description:
pH, which is accepted measure of acidity or alkalinity, is determined by change in potential of glass-saturated calomel electrodes, as measured by commercial apparatus standardized against standard buffer solutions whose pH values are assigned by NIST. pH of most natural H2O falls within 4-9. Majority of waters are slightly basic from presence of CO3-HCO3 system.

Scope:
Method is applicable to drinking, surface, and saline waters, and domestic and industrial wastes. Oils and greases may cause a sluggish response by coating electrodes.

Citation:
Official Methods of Analysis of AOAC International, 16th Edition, 4th Revision, 1998 Volume I

Interferences:
(1) Sodium error may bias results at pH > 10 unless a "low sodium error" electrode is used. (2) Coatings of oily material can impair electrode. (3) Temperature effects.

QC Requirements:
Use of three standards to check linearity of electrode response

Maximum Holding Time:
ASAP

Media:
WATER

Subcategory:
Inorganic

Precision:
-

Detection:
-

Revision Number:
15th Edition (1990)



Related Methods:
Test Method 500001    Test Method 500007    Test Method 500021    Test Method 500061    Test Method 500071    Test Method 500076    Test Method 500081    Test Method 500086    Test Method 500090    Test Method 500201   

<-- Search again



*Method information displayed is provided as a convenience only. No warranty (express or implied) is made as to its accuracy, completeness, or applicability (such as the age of a method and whether or not it applies to your project).

Suggestions? The test methods page continues to expand and improve. If you have suggestions for improvement, we would enjoy hearing from you. Please contact the webmaster here.