The liver detox sounds good. Ascorbates during liver detox is even better.

I've never heard the concept that vitamin c chelates mercury. It does protect the body against many of the effects of mercury, but not as a chelator, as far as I've ever heard.

A mercury chelator would typically be something that binds to mercury, like sulphur. This is the reason proteins are good—yet gentle—mercury chelators. They bind to mercury because of the cysteine they contain; The sulphur-bond-bearing amino acid.

Vitamin C? Don't know why it would chelate mercury.

Perhaps he meant, it would make the chelation gentler?