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what chemical method to determine the number of OH-groups in a sheet of paper?

I found it on the Internet Approximately three-quarters of the total mercury content originally present in tuna fish could be removed by two-hour extraction of one part of shredded precooked fish with 7.5 parts of dilute hydrochloric acid containing 0.33% cysteine hydrochloride. Nearly two-thirds of the mercury could be removed from 1.5 cm thick slices of precooked fish by 24-hour extraction under the same conditions, at about 2 °C. However, this is probably wrong

I am participating in a school chemistry tournament. There is such a task I use google translate that's why may be mistakes.

Unfortunately, I just need to remove the mercury from the fish

PLEASE, HELP! Suggest ways to detect and remove methylmercury from fish but don't forget that the fish must remain safe for eating. Very necessary!