What is contained in a carbon tank to absorb low molecular weight particles?

A carbon tank, specifically in the context of water treatment for hemodialysis, primarily utilizes Granular Activated Charcoal (GAC) for the absorption of low molecular weight particles. Granular Activated Charcoal has a high surface area and porous structure, which allow it to effectively trap and absorb a wide range of contaminants, including low molecular weight organic compounds and chlorine. This capability is essential in ensuring that the water used for dialysis is of high purity and free from potentially harmful substances that could affect patient safety and treatment efficacy.

The other options, such as quartz sand, ceramic filters, and mineral resins, serve different purposes in water treatment processes. Quartz sand is commonly used in filtration to remove larger particles and sediment, while ceramic filters can filter out bacteria and other pathogens but are not designed for chemical absorption. Mineral resins are used in ion exchange processes to soften water or remove specific ions but do not effectively absorb organic contaminants like GAC does. Thus, Granular Activated Charcoal is the correct answer for absorbing low molecular weight particles in a carbon tank.