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Tham khảo tài liệu 'waste water treatment and reutilization 2011 part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Ferrate VI in the Treatment of Wastewaters A New Generation Green Chemical 259 where kP is the second-order rate constant for the reaction. It was found that the reactions of ferrate VI with cadmium II cyanide Cd CN 42- zinc II cyanide Zn CN 42- and selenite SeC 32- showed the following rate equations 27 and 28 56 66-67 . The order of was found with respect to the concentrations of Cd II and Zn II cyanides equation 27 . This is different from the second-order rate law observed for the reaction of Fe VI with other cyanides CN- SCN- C CNh3- and Ni CN s- 61 64 67-68 -d Fe VI dt kp Fe VI M CN 42- 0.5 where M Cd II Zn II 27 The reaction of ferrate VI and selenite possessed with first and second-order selenite concentrations dependence terms in the rate law equation 28 56 . -d Fe VI dt kp Fe VI SeC32- k2 Fe VI SeC32- 2 28 where k2 is the third order rate constant. Recently the rate constants estimated for various inorganic compounds are tabulated in the Table 5 69 . Moreover the stoichiometry and the products obtained by oxidation of Fe VI are compiled and returned in Table 6 69 59 . Compound P Rate constant kP M-1s-1 HFeO4- P FeO42- P Iodide I- 1.06 0.07x104 - Cyanide HCN CN- 1.76 0.07x102 4.45 0.08x102a Thiocyanate SCN- 3.25 0.20x103 - Iron II tetracyanide Fe CN 42- 3.00x103 - Copper I tetracyanide Cu CN 43- 5.33 0.71x107 2.51 1.42x104 Nickel II tetracyanide Ni CN 42- 1.19 0.12x103 1.50 0.15x100 Cadmium II tetracyanide Cd CN 42- 6.71 0.17x102 2.26 1.47x10-1b Zinc II tetracyanide Zn CN 42- 4.05 0.20x102 2.39 0.14x10-1b Hydrogen sulfide H2S 2.37 0.70x107 1.52 0.52x103 Bisulfite SC32- 1.31 0.04x105 - Thiosulfate S2C32- 4.14 0.19x104 - Dithionite S2C42- 5.59 0.53x107 2.84 0.25x104 Trithionate S3C62- 3.31 0.60x101 4.41 1.23x10-1 Pentathionate S5C62- 1.10 0.10x102 - Hydroxylamine NH2CH 6.47 1.49x105 - Hydrazine N2H4 1.76 0.02x106 6.76 0.05x101 Azide N3- 8.54 0.20x106c - Nitrite NC2- 7.56 0.11x103 - Selenite SeC32- 3.98 0.20x102 - Arsenite As CH 3 2.56x103 - aHCN M s AH Table