EPA Method 258.1

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EPA Method 258.1:
Potassium by Flame AA. Official Name: Potassium (Atomic Absorption, Direct Aspiration)

Summary:
A sample prepared according to EPA Method 200.0 is analyzed using a flame atomic absorption spectrometer. Specifications for instrument operation and preparation of standards are provided in the method.

Scope:
This method determines potassium by flame atomic absorption spectrometry. Sample pretreatment according to EPA Method 200.0 determines the applicability.

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

Interferences:
For interferences see EPA Method 200.0. In air-acetylene or other high temperature flames, potassium can experience partial ionization which indirectly affects absorption sensitivity. The presence of other alkali salts may reduce this ionization. The addition of cesium may should be considered for more stringent control of ionization.

QC Requirements:
QC requirements for drinking water procedures are provided in method 200.0

Maximum Holding Time:
6 months (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.1 - 2.0 mg/L (optimal range); 0.04 mg/L (sensitivity).

Sample Prep:
200

Precision:
Precision and accuracy were calculated using analyses of fortified distilled water. Additional data are available in the method.

Detection:
The DL is to be considered the minimum working limit achievable with this method.

Revision Number:
Issued 1971; Editorial Revision 1974