EPA Method 110.2

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EPA Method 110.2:
Color by Spectrophotometry. Official Name: Color (Colorimetric-Platinum-Cobalt)

Summary:
Color is measured by visual comparison of the sample with platinum-cobalt standards. One unit of color is that produced by 1 mg/L platinum in the form of the chloroplatinate ion.

Scope:
The Platinum-Cobalt method is useful for measuring color of water derived from naturally occurring materials, i.e., vegetable residues such as leaves, barks, roots, humus, and peat materials. The method is not applicable to color measurement on waters containing highly colored industrial wastes.

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

Interferences:
(A) Turbidity: Since very slight amounts of turbidity interfere with the determination, samples showing visible turbidity should be clarified by centrifugation.(B) pH: Method is pH dependent.

QC Requirements:
None.

Maximum Holding Time:
48 hours (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
5 to 70 chloroplatinate units

Sample Prep:
None.

Precision:
Precision and accuracy data are not available.

Detection:
None.

Revision Number:
Issued 1971

Test Description:
Color -Colorimetric-

Instrument used for this test:
None