This article discusses the importance of using furnace atomic absorption methods to determine toxic metals in water and waste, as well as the need for monitoring and regulating these elements. The article mentions the regulations set by the U.S. EPA and individual states regarding the maximum allowable concentration levels of toxic metals, and the application of furnace atomic absorption methods in EPA approved methodology.
The document describes an analysis method for determining trace levels of arsenic, barium, cadmium, chromium, lead, selenium, and silver in drinking water and waste samples. It highlights the need for careful method development due to low concentration requirements (pg/L) and potential interferences.
The study utilized the Agilent AA-975 Atomic Absorption Spectrophotometer equipped with a GTA-95 Graphite Tube Atomizer and programmable sample dispenser. The note provides specific furnace operating parameters, matrix modifiers, and calibration strategies for each of the seven regulated metals to ensure accuracy in complex matrices.
| Instrument Model | Agilent AA-975 Atomic Absorption Spectrophotometer and GTA-95 Graphite Tube Atomizer |
|---|---|
| Sample Dispenser Capability | Up to four solutions in a single injection |
| Furnace Steps | Up to twenty individual steps |
| Injection Volume Range | 10 to 40 pL |
Seven metals (As, Ba, Cd, Cr, Pb, Se, and Ag) are regulated in drinking water and may be determined by furnace AA.
Ammonium nitrate was found to be the best matrix modifier for Cd.