The Nitrox mixture which can be used at any depth within the recommended recreational depth limit of 30 meters is?

Boost your confidence for the Enriched Air Nitrox Test. With engaging flashcards and detailed multiple-choice questions, each providing hints and explanations. Prepare effectively for your certification exam today!

The correct answer is EAN 32 because it contains 32% oxygen and is generally considered safe for recreational diving within the recommended depth limits, including the standard recreational limit of 30 meters (approximately 100 feet). This mixture provides an optimal balance of oxygen and nitrogen that allows for longer bottom times and reduced nitrogen absorption compared to air, reducing the risk of nitrogen narcosis and decompression sickness.

EAN 36 and EAN 40, while also useful for certain dives, have higher concentrations of oxygen. As the depth increases, the partial pressure of oxygen also increases, which can lead to oxygen toxicity if the dive exceeds certain depths—specifically, EAN 36 should be limited to depths less than around 30 meters, and EAN 40 should be used with more caution because it is more susceptible to oxygen toxicity risks.

The answer stating that all mixtures are correct would imply that each of them is suitable to be used at any depth within the recreational limit without qualification. However, this is not accurate due to the increasing risk of oxygen toxicity at greater depths for those mixtures with higher percentages of oxygen, making EAN 32 the safest option for recreational diving up to 30 meters.

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