Which substance is NOT part of the cyanide kit?

The cyanide kit is designed for the treatment of cyanide poisoning and typically includes agents that either help to convert cyanide into less harmful substances or facilitate its excretion. Sodium nitrate and amyl nitrate act as antidotes by inducing methemoglobinemia, which allows cyanide to bind to hemoglobin instead of cytochrome c oxidase, thereby mitigating its toxic effects. Sodium thiosulfate serves as a sulfur donor, helping the body convert cyanide into thiocyanate, which is then eliminated through the kidneys.

Calcium gluconate, on the other hand, does not play a role in treating cyanide poisoning. It is often used in cases of calcium deficiency or to treat hyperkalemia, but it is not a component of the cyanide kit. Therefore, its absence from the cyanide kit makes it the correct choice in this context.