The analytical technique widely used for directly measuring the amount of alcohol present in the blood is:

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Gas chromatography is the analytical technique most commonly used to directly measure the amount of alcohol present in the blood. It is a highly sensitive and accurate method that separates and detects individual components of a complex mixture, such as blood. Thin-layer chromatography, infrared spectrophotometry, and ultra-violet spectrophotometry are all analytical techniques that can be used for alcohol analysis, but they are less commonly used for blood alcohol testing.

The Analytical Technique Widely Used for Directly Measuring the Amount