Answer :
Final answer:
The gas typically used in a flame ionization detector is hydrogen, often in conjunction with air or oxygen, to ionize organic compounds and measure their concentration using a resulting current.
Explanation:
The gas used in a flame ionization detector (FID) is not explicitly mentioned in the provided information as the references pertain to Americium-241 in smoke detectors, sulfur hexafluoride as an aerial tracer, and the use of mass spectrometers with gas chromatography. However, in a flame ionization detector, hydrogen is commonly used in combination with another gas like air or oxygen to create a flame. The FID works by ionizing organic compounds in a sample, and the ions produced result in a current proportional to the concentration of the substances present. This technique is widely used in gas chromatography to detect and quantify small amounts of volatile organic compounds.
