Environmental Protection Agency (EPA) Model Lead Based Paint Risk Assessor Practice Test

What method is used for elemental analysis in lead assessment?

1. Gas chromatography

2. Atomic absorption spectrometry

3. Liquid chromatography

4. Mass spectrometry

The correct answer is: Atomic absorption spectrometry

In lead assessment, elemental analysis is crucial for accurately determining lead levels in various materials. Atomic absorption spectrometry is the preferred method for this task due to its ability to selectively measure the concentration of metals in samples. It operates by using the principle that atoms absorb light at specific wavelengths characteristic of the element being measured, allowing for precise quantification of lead content in paint chips, dust, soil, and other mediums. This method is highly sensitive and can detect lead concentrations at very low levels, making it ideal for environmental assessments where even minute amounts of lead can be hazardous to health. Other techniques, while useful for various applications, do not provide the same level of specificity and sensitivity for lead analysis as atomic absorption spectrometry. As a result, this method is widely recommended and utilized in the context of lead risk assessment and regulations established by the EPA.