Table 3.
Concentrations of total arsenic in drinking-water in San Antonio de los Cobres during 1994–2004. Water samples were collected from taps in private homes and from the water source, the natural spring Agua de Castilla
| Sampling time | No. of samples | Arsenic concentration (μg/L) |
|---|---|---|
| April 1994 | 4 | 205±15 (192–217)* |
| November 1994 | 2 | 160, 157 |
| 1 | 179** | |
| September 1995 | 2 | 214, 216 |
| May 1996 | 1 | 188 |
| August 1996 | 3 | 162, 200, 218 |
| October 1996 | 1 | 183 |
| November 1997 | 5 | 143±38 (107–195)* |
| March 1999 | 3 | 140, 180, 187 |
| 1 | 214** | |
| November 2004 | 8 | 219±7.7 (207–229)* |
| Mean | 31 | 186±26 |
*Mean, SD, and (range);
**Agua de Castilla
As=Arsenic