Research Article
Speciation Studies of L-Histidine Complexes of Pb(II), Cd(II), and Hg(II) in DMSO-Water Mixtures
Table 1
Exhaustive modeling of Cd(II)-His system in 40% v/v DMSO-water mixture. pH range = 2.0–8.0, .
| | Model No. | log (SD) | | Skewness | Kurtosis | χ 2 | -factor | | 120 | 121 | 122 | 123 | 124 | |
| | 1 | 12.15 (9) | — | — | — | — | 10.927 | −1.43 | 4.96 | 176.10 | 0.016 | | 2 | — | 18.87 (6) | — | — | — | 4.649 | 0.00 | 6.26 | 114.71 | 0.010 | | 3 | — | — | 25.44 (25) | — | — | 34.123 | −0.20 | 12.56 | 359.17 | 0.028 | | 4 | — | — | — | Rejected | — | — | — | — | — | — | | 5 | — | — | — | — | Rejected | — | — | — | — | — | | 6 | 11.27 (12) | 18.79 (5) | — | — | — | 2.740 | −1.32 | 5.35 | 100.94 | 0.008 | | 7 | 12.11 (7) | — | 25.20 (7) | — | — | 2.427 | −1.36 | 5.33 | 100.56 | 0.007 | | 8 | 12.15 (9) | — | — | Rejected | — | 10.978 | −1.43 | 4.96 | 176.10 | 0.016 | | 9 | 12.15 (9) | — | — | — | Rejected | 10.928 | −1.43 | 4.96 | 176.10 | 0.016 | | 10 | — | 18.92 (7) | 24.74 (12) | — | — | 3.687 | 0.50 | 9.42 | 116.12 | 0.009 | | 11 | — | 19.26 (11) | — | 30.78 (17) | — | 3.448 | 0.43 | 8.66 | 83.63 | 0.009 | | 12 | — | 18.87 (6) | — | — | Rejected | 4.649 | 0.00 | 6.26 | 114.71 | 0.010 | | 13 | — | — | 25.43 (26) | Rejected | — | 34.123 | −0.20 | 12.56 | 359.17 | 0.028 | | 14 | — | — | 25.64 (29) | — | 35.53 (41) | 33.541 | −0.20 | 13.11 | 412.88 | 0.028 | | 15 | — | — | — | Rejected | Rejected | — | — | — | — | — | | 16 | 11.54 (7) | 18.75 (4) | 24.91 (5) | — | — | 1.036 | −1.93 | 6.96 | 137.95 | 0.004 | | 17 | 11.63 (11) | 19.17 (8) | — | 30.72 (12) | — | 1.642 | −1.04 | 4.00 | 69.05 | 0.006 | | 18 | 11.26 (12) | 18.88 (5) | — | — | Rejected | 2.740 | −1.32 | 5.35 | 100.94 | 0.008 | | 19 | 12.11 (7) | — | 25.19 (6) | Rejected | — | 2.427 | −1.36 | 5.33 | 100.56 | 0.007 | | 20 | 12.25 (7) | — | 25.39 (7) | — | 35.34 (11) | 1.979 | −1.22 | 6.41 | 53.76 | 0.006 | | 21 | 12.91 (21) | — | — | 31.06 (25) | Rejected | 8.500 | −1.43 | 5.41 | 121.02 | 0.014 | | 22 | — | 19.16 (12) | 24.71 (21) | 30.59 (21) | — | 3.316 | 0.55 | 10.31 | 151.88 | 0.008 | | 23 | — | 19.04 (8) | 24.96 (13) | — | 35.17 (19) | 3.484 | 0.73 | 10.39 | 107.52 | 0.009 | | 24 | — | 19.42 (11) | — | 31.00 (15) | 35.25 (17) | 3.168 | 0.73 | 9.82 | 62.68 | 0.008 | | 25 | — | — | 25.64 (29) | Rejected | 35.53 (40) | 33.541 | −0.20 | 13.11 | 412.88 | 0.028 | | 26 | 11.62 (7) | 18.89 (6) | 24.94 (6) | 30.16 (19) | — | 0.957 | −2.04 | 7.71 | 159.99 | 0.004 | | 27 | 11.70 (6) | 18.87 (4) | 25.12 (5) | — | 35.20 (8) | 0.766 | −1.06 | 5.55 | 36.56 | 0.004 | | 28 | 12.25 (7) | — | 25.39 (7) | Rejected | 35.34 (11) | 1.979 | −1.22 | 6.41 | 53.76 | 0.006 | | 29 | — | 19.32 (11) | 24.92 (19) | 30.81 (19) | 35.28 (16) | 2.989 | 0.93 | 12.16 | 126.63 | 0.008 | | 30 | 11.80 (11) | 19.34 (7) | — | 30.96 (10) | 35.20 (12) | 1.382 | −0.50 | 3.58 | 26.22 | 0.005 | | 31 | 11.78 (6) | 19.05 (6) | 25.15 (5) | 30.45 (13) | 35.25 (7) | 0.630 | −0.75 | 5.64 | 56.26 | 0.003 |
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; m = number of species; NP = number of experimental points; SD = standard deviation.
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