What is flame emission spectroscopy primarily used for?

Flame emission spectroscopy is primarily used to analyze metal ions in solutions. This analytical technique involves introducing a sample into a flame, where the heat causes the atoms in the sample to become excited and emit light at characteristic wavelengths. Each metal ion emits light at specific wavelengths when heated, allowing for their identification and quantification.

The method is particularly effective for detecting alkali and alkaline earth metals, making it a valuable tool in various fields such as environmental science, biology, and materials science. By measuring the intensity of the emitted light at these specific wavelengths, one can determine the concentration of particular metal ions in a solution, which is essential for various analytical applications.

Other options such as identifying organic compounds, measuring gas concentrations, and determining pH levels do not align with the specific capabilities of flame emission spectroscopy, as those processes require different techniques, such as chromatography for organic compounds, gas chromatography or infrared spectroscopy for gases, and pH meters or indicators for pH levels.