NEMI Method Summary


Method Summary Information

Method Number:

206.3

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:

Arsenic (Atomic Absorption - Gaseous Hydride)

Descriptive Name

Arsenic by Gaseous Hydride Generation and AA

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)

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Brief Method
Summary:

Arsenic in a sample is first reduced to the trivalent form using stannous chloride, and converted to arsine (arsenic tri-hydride) using zinc metal. The gaseous hydride is swept into an argon-hydrogen flame of an atomic absorption spectrophometer and measured.

Scope And
Application:

This method determines inorganic arsenic in drinking water and most fresh and saline waters in the absence of high concentrations of chromium, cobalt, copper, mercury, molybdenum, nickel, and silver.

Applicable
Conc Range:

2-20 ug/L (working range).

Interferences:

For interferences see EPA Methods 200.0 and 206.5.

QC Requirements:

Spike industrial waste samples with a known amount of arsenic to establish adequate recovery. QC requirements for drinking water procedures are provided in method 200.0.

Sample Handling:

Sample handling and preservation procedures are provided in EPA Method 200.0 and 206.5. EPA Method 206.5 also provides a procedure to convert arsenic to an inorganic form detectable by this method.

Max Holding Time:

6 months (MCAWW, Table 1).

Sample Prep Met

200.0, 206.5

Relative Cost:

Less than $50

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Method Summary Information