AOAC Test Method 973.41


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Analytical testing dots

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)

Analytical testing dots

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Analytical testing dots