Research Article
Speciation Studies of L-Histidine Complexes of Pb(II), Cd(II), and Hg(II) in DMSO-Water Mixtures
Table 2
Best-fit chemical models of His complexes with Pb(II), Cd(II), and Hg(II) in DMSO-water mixtures.
| | DMS % v/v | log (SD) | NP | | Skewness | Kurtosis | χ 2 | -factor | pH range | | 110 | 120 | 121 | 122 | 123 | 124 | |
| | | | | | | Pb(II) | | | | | | | |
| | 0.0 | — | 9.37 (40) | 18.36 (40) | 25.07 (41) | 31.10 (42) | 36.90 (42) | 38 | 0.137 | 0.67 | 7.15 | 32.11 | 0.002 | 3.5–9.0 | | 10.0 | — | 9.65 (29) | 19.29 (28) | 26.02 (28) | 31.78 (30) | 37.54 (29) | 29 | 0.385 | 0.06 | 2.45 | 2.66 | 0.004 | 3.5–9.0 | | 20.0 | — | 9.10 (30) | 18.59 (30) | 25.29 (31) | 31.07 (33) | 36.67 (35) | 19 | 0.094 | 0.64 | 4.22 | 5.74 | 0.001 | 3.7–9.0 | | 30.0 | — | 9.80 (13) | 19.21 (10) | 25.65 (12) | 30.82 (19) | 36.43 (16) | 44 | 0.328 | 0.59 | 4.19 | 10.67 | 0.004 | 3.5–9.0 | | 40.0 | — | 10.81 (34) | 19.64 (32) | 25.90 (34) | 31.35 (39) | 36.70 (39) | 47 | 1.323 | 0.35 | 3.14 | 18.38 | 0.008 | 3.5–9.0 | | 50.0 | — | 10.03 (9) | 19.29 (8) | 25.31 (9) | 30.22 (16) | 35.46 (15) | 45 | 0.270 | 1.39 | 9.68 | 18.30 | 0.003 | 3.5–9.0 | | 60.0 | — | 9.77 (16) | 19.07 (13) | 25.02 (17) | 29.90 (29) | 35.02 (30) | 49 | 0.915 | 0.86 | 5.16 | 9.90 | 0.006 | 3.5–9.0 |
| | | | | | | Cd(II) | | | | | | | |
| | 0.0 | — | 10.25 (14) | 17.80 (15) | 24.35 (16) | 30.55 (17) | 36.26 (18) | 50 | 0.282 | 1.85 | 12.03 | 59.28 | 0.003 | 3.0–8.0 | | 10.0 | — | 10.63 (26) | 18.36 (26) | 25.02 (29) | 31.19 (29) | 36.96 (30) | 49 | 0.522 | 2.45 | 13.66 | 68.13 | 0.005 | 3.0–8.0 | | 20.0 | — | 10.22 (12) | 17.63 (12) | 23.97 (20) | 29.88 (28) | 34.95 (69) | 37 | 0.362 | 1.50 | 7.91 | 18.23 | 0.003 | 3.0–8.0 | | 30.0 | — | 11.01 (8) | 18.55 (7) | 24.90 (10) | 30.55 (14) | 35.85 (18) | 44 | 0.244 | 0.77 | 6.03 | 13.82 | 0.003 | 3.5–8.0 | | 40.0 | — | 11.78 (6) | 19.05 (6) | 25.15 (5) | 30.45 (13) | 35.25 (7) | 98 | 0.630 | −0.75 | 5.64 | 56.26 | 0.003 | 2.0–8.0 | | 50.0 | — | 12.11 (7) | 19.28 (6) | 25.22 (6) | 30.24 (16) | 35.01 (8) | 96 | 0.751 | −0.93 | 6.80 | 80.00 | 0.004 | 2.0–8.0 | | 60.0 | — | 12.10 (7) | 18.91 (6) | 24.83 (5) | 29.68 (17) | — | 22 | 0.356 | 1.38 | 6.32 | 5.52 | 0.003 | 3.5–8.5 |
| | | | | | | Hg(II) | | | | | | | |
| | 0.0 | 10.09 (24) | 13.18 (34) | — | — | 33.83 (23) | 35.21 (87) | 90 | 0.824 | −0.78 | 4.70 | 47.16 | 0.004 | 2.0–8.0 | | 10.0 | 12.42 (49) | 16.78 (85) | — | — | 31.60 (65) | — | 95 | 99.96 | −0.71 | 6.23 | 307.70 | .0494 | 2.0–8.0 | | 20.0 | 11.57 (33) | 14.78 (55) | — | — | 32.38 (86) | 35.81 (40) | 65 | 4.295 | 0.19 | 5.38 | 107.97 | .0103 | 2.0–9.0 | | 30.0 | 11.57 (32) | 14.59 (35) | — | — | 34.56 (29) | 37.27 (36) | 65 | 0.533 | −0.26 | 7.16 | 9.68 | 0.003 | 2.0–9.0 | | 40.0 | 12.31 (20) | 16.13 (23) | — | — | 34.55 (14) | 36.83 (22) | 36 | 0.192 | −0.20 | 4.15 | 15.70 | 0.001 | 2.0–9.0 | | 50.0 | 12.31 (31) | 15.58 (34) | — | — | 35.00 (29) | 37.36 (36) | 106 | 0.650 | −0.55 | 4.19 | 20.31 | 0.003 | 2.0–9.0 | | 60.0 | 12.49 (22) | 15.55 (28) | — | — | 34.87 (19) | 37.40 (24) | 105 | 0.668 | −0.09 | 3.40 | 23.67 | 0.003 | 2.0–9.0 |
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