EPA Method 130.1

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EPA Method 130.1:
Total Hardness by Spectrophotometer. Official Name: Hardness, Total (mg/L as CaCO3) (Colorimetric, Automated EDTA)

Summary:
The magnesium EDTA exchanges magnesium on an equivalent basis for any calcium and/or other cations to form a more stable EDTA chelate than magnesium. The free magnesium reacts with calmagite at a pH of 10 to give a red-violet complex. Thus, by measuring only magnesium concentration in the final reaction stream, an accurate measurement of total hardness is possible.

Scope:
This automated method determines the hardness of drinking, surface, and saline waters. Approximately 12 samples 3 per hour can be analyzed.

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

Interferences:
None.

QC Requirements:
None.

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

Media:
WATER

Subcategory:
Inorganic

Concentration:
10-400 mg/L

Sample Prep:
None.

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
None.

Revision Number:
Issued 1971