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NO3- + e + 2H+ = NO2 + H2O /*8
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As3- + 4H2O + 8NO3- + 16H+ = (AsO4)3- + 8H+ + 8NO2 + 8H2O
As3- + 8NO3- + 8H+ = (AsO4)3- + 8NO2 + 4H2O
AsH3 + 8HNO3 =H3AsO4 + 8NO2 + 4H2O