Research Article
Determination of Phosphorus in Soil by ICP-OES Using an Improved Standard Addition Method
Table 6
Comparison of the determined results of ISAM, CCM, and CSAM.
| | Sample | ISAM | CCM | CSAM | Certified value | | Value (mg/kg) | △2 | RSD (%) | Value (mg/kg) | △3a | RSD (%) | Value (mg/kg) | △4b | RSD (%) | (mg/kg) |
| | GSS-5 | 396 | 6 | 3.94 | 381 | 9 | 3.44 | 403 | 13 | 1.34 | 390 ± 34 | | GSS-8 | 765 | 10 | 3.12 | 768 | 7 | 3.22 | 767 | 8 | 1.19 | 775 ± 25 | | GSS-14 | 717 | 13 | 1.23 | 739 | 9 | 1.78 | 745 | 15 | 1.25 | 730 ± 28 | | GBW(E)070041 | 530 | 6 | 3.85 | 509 | 15 | 3.40 | 509 | 15 | 1.72 | 524 ± 26.2 |
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a△3 = the value obtained by CCM—certified value; b△4 = the value obtained by CSAM—certified value.
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