EPA Method 150.2


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EPA Method 150.2:
pH in Water. Official Name: pH, Continuous Monitoring (Electrometric)

Summary:
The pH of a sample is determined electrometrically using a glass electrode with a reference electrode or a single combination electrode.

Scope:
This method continuously determines pH in drinking, surface, and saline waters; domestic and industrial waste waters.

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
(A) Coating: Inspect electrodes every 30 days to ensure there is not a build-up of oily material or lime on the electrode. Clean electrodes with dilute HCl as required.(B) Temperature: Temperature effects must be compensated for.(C) Sodium: error at pH levels greater than 10 can be reduced or eliminated by using a "low sodium error" electrode.

QC Requirements:
None.

Maximum Holding Time:
Not Applicable.

Media:
WATER

Subcategory:
Inorganic

Concentration:
None Provided

Precision:
A precision of 0.1 pH units is generally attainable in the pH range of 6-8.

Detection:
None.

Revision Number:
Dec-82

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Examples:  8260
TO-15

Examples:  Dioxin
Mercury
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