NEMI Method Summary


Method Summary Information

Method Number:

110.2

Media:

WATER

Revision:

Issued 1971

Method Source:

U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]

Analytes in this method

Subcategory:

INORGANIC

Official Name:

Color (Colorimetric-Platinum-Cobalt)

Descriptive Name

Color by Spectrophotometry

Source Info:

U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov

Citation:

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

21344

Byte file

Brief Method
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 And
Application:

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.

Applicable
Conc Range:

5 to 70 chloroplatinate units

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.

Sample Handling:

Representative samples shall be taken in scrupulously clean glassware. Refrigerate at 4^oC.

Max Holding Time:

48 hours (MCAWW, Table 1).

Sample Prep Met

None.

Relative Cost:

Less than $50

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Method Summary Information