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Metal is a big part of The Ferrokin. In fact, metal poisoning specifically is mentioned in part one of the origin series. When Mercury is heated, it gives off toxic fumes. The most common form of treatment is chelation therapy (which is what the doctors in this scene are testing). The experiment depicted in the book is created solely for the story.   (Chelation Therapy, 2015)

 

There are more side effects of metal poisoning that can be listed. But the most common are mental disorders, nerve damage, extreme sickness, burns on the skin, and even skin discoloration depending on the metal and toxicity level. (Metallosis After, 2015)

 

Metals in the alkali group react violently in water, so in other words, they explode. Some even with a strong enough reaction to destroy small buildings depending on the amount of metal and water present. And, as in the dialogue, when alkali metals react to water they give off a smell similar to ammonia. (The Alkali Metals, 2015)

 

This video by ironnica shows the characteristics of alkali metals. At the end of the video it shows how these metals react in water: