EPA Method 206.3

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EPA Method 206.3:
Arsenic by Gaseous Hydride Generation and AA. Official Name: Arsenic (Atomic Absorption - Gaseous Hydride)

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.

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.

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

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.

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



2-20 ug/L (working range).

Sample Prep:
200.0, 206.5

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

The DL is to be considered the minimum working limit achievable with this method.

Revision Number:
Issued 1974