Table 3.
Manganese levels (μg/g) in the different fractions of the recharge card coatings.
| Samples | Exchangeable | Carbonate bound | Mn-oxide bound | Organic bound | Residual | Total |
|---|---|---|---|---|---|---|
A ( 100) |
938.875 | 747.125 | 992.000 | 782.250 | 924.625 | 3641.875 |
| A ( 200) |
567.000 | 534.875 | 760.75 | 619.375 | 744.500 | 3226.500 |
| A ( 400) |
743.875 | 647.375 | 872.875 | 724.500 | 873.500 | 3862.125 |
| B ( 200) |
535.875 | 498.000 | 743.375 | 568.500 | 689.125 | 3034.875 |
| B ( 500) |
866.500 | 698.000 | 905.750 | 755.500 | 893.500 | 4119.250 |
| C ( 200) |
666.250 | 602.750 | 817.625 | 688.500 | 842.625 | 3617.750 |
| C ( 500) |
610.750 | 564.250 | 786.875 | 652.125 | 790.625 | 3404.625 |
| Mean ± s.d. | 704.16 ± 152.93 | 613.20 ± 89.63 | 839.89 ± 88.93 | 684.39 ± 76.33 | 822.64 ± 85.01 | |
| CV | 21.72 | 14.62 | 9.14 | 11.15 | 10.33 |