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| Samples | Found/c × 108/mol L−1 | ICP-AES/c × 108/mol L−1 | RSD/% | Recovery/% |
|---|---|---|---|---|
| The Shuhe river | 6.479 ± 0.083 | 6.398 | 1.28 | 101.27 |
| The Xiuzhen river | 3.432 ± 0.058 | 3.512 | 1.70 | 97.71 |
| The Grand Canal | 4.623 ± 0.074 | 4.439 | 1.61 | 104.15 |
| The Baima Lake | 7.237 ± 0.074 | 6.928 | 1.02 | 104.46 |
