Research Article
Speciation Studies of L-Histidine Complexes of Pb(II), Cd(II), and Hg(II) in DMSO-Water Mixtures
Table 3
Effect of errors in influential parameters on Pb(II)-His complex stability constants in 50% v/v DMSO-water mixture.
| | Ingredient | % Error | log (SD) | | 120 | 121 | 122 | 123 | 124 |
| | 0 | 10.03 (9) | 19.29 (8) | 25.31 (9) | 30.22 (16) | 35.46 (15) | | −5 | 14.52 (13) | 21.26 (11) | 26.28 (17) | 31.92 (12) | Rejected | | Acid | −2 | 11.44 (11) | 20.00 (9) | 25.38 (12) | 30.93 (13) | 34.98 (34) | | +2 | Rejected | 18.62 (22) | 25.32 (27) | Rejected | 35.88 (35) | | +5 | Rejected | 16.50 (75) | 25.12(78) | Rejected | 36.29 (86) | | −5 | Rejected | 15.84 (35) | 24.62 (35) | Rejected | 35.53 (50) |
| | −2 | Rejected | 18.55 (17) | 25.25 (21) | Rejected | 35.71 (30) | | Alkali | +2 | 11.48 (11) | 19.97 (9) | 25.37 (12) | 30.88 (13) | 35.28 (23) | | +5 | 13.99 (9) | 20.67 (8) | 25.71 (14) | 31.37 (9) | Rejected |
| | −5 | 10.00 (17) | 19.20 (14) | 25.37 (20) | Rejected | 35.82 (26) | | −2 | 10.05 (13) | 19.29 (12) | 25.36 (13) | 30.18 (27) | 35.66 (20) | | Ligand | +2 | 10.01 (7) | 19.31 (6) | 25.28 (7) | 30.27 (11) | 35.22 (14) | | +5 | 10.02 (8) | 19.36 (6) | 25.24 (7) | 30.34 (11) | 34.73 (26) | | −5 | 9.94 (12) | 19.26 (9) | 25.34 (11) | 30.32 (18) | 35.61 (17) |
| | −2 | 9.99 (11) | 19.28 (8) | 25.32 (10) | 30.27 (17) | 35.51 (16) | | Log F | +2 | 10.06 (9) | 19.31 (7) | 25.30 (9) | 30.19 (16) | 35.39 (15) | | +5 | 10.12 (8) | 19.34 (6) | 25.30 (8) | 30.15 (15) | 35.30 (15) | | −5 | 10.17 (8) | 19.31 (6) | 25.22 (8) | 30.13 (15) | 35.27 (15) |
| | −2 | 10.08 (8) | 19.30 (7) | 25.27 (9) | 30.18 (16) | 35.38 (15) | | Metal | +2 | 10.06 (8) | 19.31 (7) | 25.30 (9) | 30.19 (16) | 35.39 (15) | | +5 | 10.12 (8) | 19.34 (6) | 25.30 (8) | 30.15 (15) | 35.30 (15) | | −5 | 9.98 (9) | 19.24 (8) | 25.27 (9) | 30.17 (17) | 35.40 (16) |
| | −2 | 10.01 (9) | 19.27 (8) | 25.30 (9) | 30.21 (16) | 35.43 (15) | | Volume | +2 | 10.04 (9) | 19.31 (7) | 25.33 (9) | 30.24 (16) | 35.47 (15) | | +5 | 10.07 (9) | 19.34 (7) | 25.36 (9) | 30.28 (16) | 35.50 (15) |
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