Table 3.
Arsenic species in Ajo before and after bottled-water intervention
| Arsenic species or ratio | Pre-intervention | Post-intervention | p value |
|---|---|---|---|
| Urine (n) | 36 | 36 | |
| Total arsenic (μg/L) | 28.3±18.9 | 22.4±21.4 | 0.035 |
| Total inorganic arsenic (μg/L) | 29.4±21.1 | 23.2±23.2 | 0.026 |
| Creatinine (μg/dL)* | 109.2±58.3 | 107.9±86.2 | 0.424 |
| Total inorganic arsenic/creatinine (μg/g)* | 27.8±10.1 | 31.8±23.7 | 0.79 |
| As3+ (μg/L) | 6.4±9.0 | 10.3±20.8 | 0.730 |
| As5+ (μg/L) | 2.1±2.7 | 1.7±1.9 | 0.943 |
| MMA (μg/L) | 3.0±3.8 | 2.0±1.8 | 0.091 |
| DMA (μg/L) | 17.9±12.7 | 9.1±8.1 | <0.001 |
| MMA/(As3++As5+) | 0.7±0.6 | 1.2±3.5 | 0.814 |
| DMA/(As3++As5+) | 5.3±6.1 | 3.8±5.2 | 0.114 |
| DMA/MMA | 8.3±5.2 | 5.0±3.3 | 0.001 |
| Toenail (n) | 34 | 34 | |
| Arsenic (μg/g) | 0.49±0.68 | 0.26±0.19 | 0.061 |
*Number of samples with available valid creatinine levels=11
As=Arsenic;
DMA=Dimethylarsenic acid;
MMA=Monomethylarsonic acid