Table 1. Detection of Hg2+, Co2+, Fe2+, and Fe3+ in Natural Water Samples after Adding Standard Concentration of the Corresponding Metal Ions.
| Hg2+a |
Co2+a |
Fe2+a |
Fe3+a |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| samples | spiked/ppb | found/ppb | RDS% | ICP-AES | found/ppb | RDS% | ICP-AES | found/ppb | RDS% | ICP-AES | found/ppb | RDS% | ICP-AES |
| tap water | blank | b | |||||||||||
| 30.0 | 26.5 | 6.4 | 31.9 | 28.5 | 4.8 | 32.1 | 31.5 | 4.6 | 27.8 | 28.9 | 6.1 | 26.7 | |
| 100.0 | 97.4 | 3.1 | 104.3 | 97.6 | 2.9 | 92.4 | 97.3 | 3.1 | 94.5 | 92.1 | 2.9 | 109.2 | |
| 300.0 | 317.4 | 2.9 | 302.6 | 291.3 | 1.7 | 278.3 | 292.0 | 2.0 | 278.3 | 311.2 | 1.8 | 284.4 | |
| Yangtze River water | blank | 1.8 | 0.9 | 10.7 | 0.8 | 11.5 | 2.5c | 2.5c | |||||
| 30.0 | 25.4 | 7.1 | 29.1 | 27.9 | 5.1 | 25.9 | 32.1 | 3.8 | 32.7 | 31.3 | 8.3 | 27.9 | |
| 100.0 | 101.2 | 3.2 | 105.4 | 98.4 | 2.7 | 91.3 | 102.5 | 1.7 | 105.5 | 111.2 | 3.2 | 102.6 | |
| 300.0 | 329.9 | 1.9 | 305.6 | 287.5 | 2.2 | 264.7 | 314.0 | 1.3 | 308.7 | 317.4 | 2.7 | 315.4 | |
| Jianghan Plain groundwater | blank | 2.6 | 1.4 | 9.4 | 2.3 | 1.6 | 9.1 | 3.7c | 3.7c | ||||
| 30.0 | 25.7 | 7.5 | 36.5 | 32.2 | 2.5 | 31.0 | 27.4 | 3.5 | 32.4 | 31.2 | 7.4 | 31.9 | |
| 100.0 | 104.5 | 3.7 | 110.2 | 104.3 | 1.6 | 97.5 | 110.1 | 1.4 | 106.5 | 98.7 | 2.3 | 107.6 | |
| 300.0 | 335.8 | 2.6 | 308.7 | 291.4 | 1.0 | 271.6 | 325.6 | 0.9 | 319.4 | 308.9 | 2.0 | 322.2 | |
a
Average of three measurements.
b
Below the detection limit.
c
Specified speciation cannot be measured and the values are the total iron concentration.