Professor Wiskamp certainly raises an important
point. We should be just as concerned about the removal of
sulfide from the filtrate as removal of the transition
metals. We have tested filtrates from this experiment with lead
acetate test paper and have found that, as long as the
waste treatment procedure is followed as we have described,
sulfide ion is not detectable (the lower limit of the
sensitivity of the lead acetate paper is 25 parts per million
according to the manufacturer).
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Citation
Nash, John J.; Nurrenbern, Susan C.; Meyer, Jeanne A. R. J. Chem. Educ.1997 74 1152.
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