Hydrogen sulfide has an odor recognition threshold concentration of 0.47 ppb. Describe the minimum concentration of both sulfate and lactate that would lead to the recognition of H2S based on the equations. Assume that both reactions convert 100% of the starting material. Give your answer in mM and ug/L for both sulfate and lactate.
Eqn 1: 2 lactate +SO42- --> 2 acetate + S2- +H2O + CO2
Eqn 2: S2- + 2H+ --> H2S