NEMI Method Summary


Method Summary Information

Method Number:

212.3

Media:

WATER

Revision:

Issued 1974

Method Source:

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

Analytes in this method

Subcategory:

INORGANIC

Official Name:

Boron (Colorimetric, Curcumin)

Descriptive Name

Boron by Colorimetry

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)

9884

Byte file

Brief Method
Summary:

When a sample of water containing boron is acidified and evaporated in the presence of curcumin, a red-colored product called rosocyanine is formed. The rosocyanine is taken up in a suitable solvent, and the red color (which is proportional to colorimetry) is compared with standards photometrically.

Scope And
Application:

This method determines boron in drinking waters, surface waters, domestic and industrial wastes.

Applicable
Conc Range:

0.1-1.0 mg/L (optimal range).

Interferences:

(A) Nitrate: Nitrate above 20 mg/L can interfere.
(B) Hardness: Hardness above 100 mg/L can interfere. Passing the sample through a cation exchange resin eliminates this problem.

QC Requirements:

None.

Sample Handling:

Max Holding Time:

6 months (MCAWW, Table 1).

Sample Prep Met

None.

Relative Cost:

Less than $50

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Method Summary Information