EPA Method 9040-B

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EPA Method 9040-B:
pH in Water by Electrometric Measurement. Official Name: pH Electrometric Measurement

Summary:
The pH of the sample is determined electrometrically using either a glass electrode in combination with a reference potential or a combination electrode. The measuring device is calibrated using a series of standard solutions of known pH.

Scope:
Method 9040 is used to measure the pH of aqueous wastes and those multiphase wastes where the aqueous phase constitutes at least 20% of the total volume of the waste. The corrosivity of concentrated acids and bases, or of concentrated acids and bases mixed with inert substances, cannot be measured. The pH measurement requires some water content.

Citation:
SW-846 Online: Test Methods for Evaluating Solid Waste, Physical/Chemical Methods

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:
See Chapter One for information.

Maximum Holding Time:
Samples should be analyzed as soon as possible.

Media:
WATER

Subcategory:
Inorganic

Concentration:
None given.

Precision:
-

Detection:
-

Revision Number:
Jan-95