Table 5.
Comparison of the determined results of total P by ISAM with standard solutions diluted by soil digestion solution of GSS-14 and by the soil mixture solution.
| Sample | Standard solutions diluted by soil digestion solution of GSS-14 | Standard solutions diluted by the soil mixture solution | Certified value | ||
|---|---|---|---|---|---|
| Total P value obtained by ISAM (mg/kg) | △1a | Total P value obtained by ISAM (mg/kg) | △2b | (mg/kg) | |
| GSS-5 | 370 | 20 | 396 | 6 | 390 ± 34 |
| GSS-8 | 776 | 1 | 765 | 10 | 775 ± 25 |
| GSS-14 | 734 | 4 | 717 | 13 | 730 ± 28 |
| GBW (E) 070041 | 544 | 20 | 530 | 6 | 524 ± 26.2 |
a△1 = the value obtained by ISAM with the standard solutions diluted by soil digestion solution of GSS-14—certified value; b△2 = the value obtained by ISAM with the standard solutions diluted by the soil mixture solution—certified value.