Cd Cu Pb Zn Cd Cu Pb Zn Cd Cu Pb Zn Table 2. Cont. Y = 4E-05x + 0.0016 Y = 0.0007x – 0.0018 Y = 0.0004x + 0.0472 Y = -0.0006x + 0.0863 Y = -1E-05x + 0.0028 Y = 6E-05x + 0.0102 Y = -5E-05x + 0.1008 Y = -0.0004x + 0.0691 Y = 1E-05x + 0.0018 Y = 0.001x – 0.0177 Y = 0.0012x + 0.0307 Y = -9E-05x + 0.0531 0.7968 0.6374 0.3184 0.0791 0.1294 0.0341 0.0029 0.1059 0.1064 0.4224 0.8414 0.0045 0.893*** 0.798** 0.564 0.281 0.360 0.185 0.054 0.325 0.326 0.650 0.917*** 0.067 Y = dependent variable (metal level), x = independent variable (temperature), b = slope and c = intercept, r = coefficient of correlation, * Significant at p < 0.10, ** Significant at p < 0.05, ***Significant at p < 0.01. Table 3. Potential water-extractable Pb and Cd (mg·kg-1) from composted wastes of Nigerian origin relative to incremental temperature rise by 0.1oC. Compost_HHW-T Compost_HH W-U Compost_AGW-T Compost_AGW-U Compost_MSW-T Compost_MSW-U Y = 0.0002x + 0.0679 Y = 0.003x + 0.0479 Y = 0.0012x + 0.0307 Y = –5E-05x + 0.1008 Y = 0.0004x + 0.0472 Y = –0.0007x + 0.0905 Int. J. Environ. Res. Public Health 2009, 6 2403 0.09043 0.09036 0.09029 0.09022 0.09015 0.09008 0.09007 0.09000 0.08987 0.08980 0.08973 0.08966 0.08959 0.08952 0.08945 -0.00007 -1.08% 0.001104 0.001108 0.001112 0.001116 0.001120 0.001124 0.001128 0.001132 0.001136 0.001140 0.001144 0.001148 0.001152 0.001156 0.001162 0.000004 5.25% Temp. (oC) Pb 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 *∆ **∆ 0.1, 1.5 Cd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 *∆ **∆ 0.1, 1.5 CMSW-T CAGW-U CAGW-T 0.06792 0.06794 0.06796 0.06798 0.06800 0.06802 0.06804 0.06806 0.06808 0.06810 0.06812 0.06814 0.06816 0.06818 0.06820 0.00002 0.41 % -0.0019 -0.0018 -0.0017 -0.0016 -0.0015 -0.0014 -0.0013 -0.0012 -0.0011 -0.0010 -0.0009 -0.0008 -0.0007 -0.0006 -0.0005 0.0001 73.68% Y = 0.001x – 0.0020 Y = 0.001x – 0.0014 Y = 1E-05x + 0.0018 Y = –1E-05x + 0.0028 Y= 4E-05x + 0.0016 Y= 4E-05x + 0.0011 HHW = household waste, AGW = Agricultural waste, MSW = municipal solid waste, U = unturned series, T = turned series, *∆ = incremental change by 0.1oC rise, **∆ = percentage change between 0.1 and 1.5oC. 0.0482 0.0485 0.0488 0.0491 0.0494 0.0497 0.0500 0.0503 0.0506 0.0509 0.0512 0.0515 0.0518 0.0521 0.0524 0.0003 8.71% -0.0013 -0.0012 -0.0011 -0.0010 -0.0009 -0.0008 -0.0007 -0.0006 -0.0005 -0.0004 -0.0003 -0.0002 -0.0001 0.000 0.0001 0.0001 108% 0.03082 0.03094 0.03106 0.03118 0.03130 0.03142 0.03154 0.03166 0.03178 0.03190 0.03202 0.03214 0.03226 0.03238 0.03250 0.00012 5.45% 0.001801 0.001802 0.001803 0.001804 0.001805 0.001806 0.001807 0.001808 0.001809 0.001810 0.001811 0.001812 0.001813 0.001814 0.001815 0.000001 0.78% 0.100795 0.100790 0.100785 0.100780 0.100775 0.100770 0.100765 0.100760 0.100755 0.100750 0.100745 0.100740 0.100735 0.100730 0.100725 -0.000005 -0.07% 0.002799 0.002798 0.002797 0.002796 0.002795 0.002794 0.002793 0.002792 0.002791 0.002790 0.002789 0.002788 0.002787 0.002786 0.002785 -0.000001 -0.50% 0.04724 0.04728 0.04732 0.04736 0.04740 0.04744 0.04748 0.04752 0.04756 0.04760 0.04764 0.04768 0.04772 0.04726 0.04730 0.00004 0.13% 0.001604 0.001608 0.001612 0.001616 0.001620 0.001624 0.001628 0.001632 0.001636 0.001640 0.001644 0.001648 0.001652 0.001656 0.001660 0.000004 3.49%