What is a Flame Photometer?

The machine operates on a very simple fact of chemistry: Different metals burn with different colored flames. For example, if you throw Sodium into a fire, it burns with a bright yellow flame. Potassium burns with a pale purple flame. Furthermore, the intensity (brightness) of that colored flame is directly proportional to the amount of metal present. A tiny bit of sodium gives a faint yellow flame; a massive amount of sodium creates a blindingly bright yellow flame.

1. Nebulization: The liquid sample (e.g., blood serum) is sucked into the machine and sprayed as a fine mist into a high-temperature gas flame.
2. Excitation: The intense heat evaporates the water and forces the metal atoms to absorb energy. As the atoms cool down a microsecond later, they release that energy in the form of a specific colored light.
3. Optical Filter: A specialized glass filter is used. If we are looking for Sodium, we use a filter that blocks all light except the exact yellow wavelength of Sodium.
4. Photo-Detector: This electronic sensor looks at the yellow light, mathematically calculates exactly how intensely bright it is, and displays a digital number showing the exact concentration of Sodium in the sample.

• Medical Labs: It is the absolute gold standard for quickly testing the electrolyte balance in a patient's blood or urine (checking their Sodium and Potassium levels to ensure their heart functions properly).
• Agriculture: Used to test soil samples to see if the dirt contains enough Potassium and Calcium for crops to grow.