Mr Reynholm wrote:
Aside from symbolism what is the real opposition to Zyclon B as a means of execution?
It is not always fatal to exposure, which can be a problem in executions. Back in WWII, there were victims that survived the gas chambers only to be burned alive in the crematorium ovens in concentration camps. The German guards did not care where they died, only that they died to fill their quotas. Humans can be truly evil sometimes.
Hydrogen cyanide gas blocks certain enzyme functions in the respiratory cycle. That inhibition prevents the body from producing ATP which is needed to power the body. Thus, you drop dead literally. The process is much quicker if given as a concentrated liquid solution into the body, rather than breathing the gas form.
If a cyanide salt decomposes/reacts before it is used in the execution, the amount of hydrogen cyanide that can be produced from it will also decrease. A certain amount of hydrogen cyanide is required to shut down the enzymes. If that is not met, the person is damaged but can still live. An famous example of someone surviving cyanide is Gregory Rasputin. He was poisoned with potassium cyanide in his drink, but did not die from that event.
https://www.irishtimes.com/news/rasputi ... ll-1.67169It becomes a legal nightmare if the prisoner can survive the gas chamber process.
FYI - At a previous teaching job, I had to deal with thirty pounds of cyanide salts that were being improperly stored by another chemist. When I found them, they were being stored under a leaky sink. Good thing the containers were sealed well or I would not be here to type this. That was just the top of the iceberg on the safety issues that I had to fix there.