| Autor: |
Seifferlein, Emily Rose, Jones, Patty, Ferguson, Richard, Burt, Rebecca, Mays, Dewayne |
| Předmět: |
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| Zdroj: |
Communications in Soil Science & Plant Analysis; 2005, Vol. 36 Issue 15/16, p2067-2083, 17p |
| Abstrakt: |
Titratable or extractable acidity is a measure of the acidity released by a soil to a buffered extraction solution. The United States Natural Resources Conservation Service (NRCS) Soil Survey Laboratory (SSL) routinely measures extractable acidity on soils that are carbonate free. In this study, a centrifuge method for measuring acidity extracted by barium chloride triethanolamine (BaCl 2 ‐TEA), pH 8.2, is described. Compared with the SSL vacuum extraction method, the proposed method provides better reproducibility for highly acidic soils, typically organic or andic materials. Key variables resolved while developing this method were extraction time and sample mass. Soil chemistry can significantly affect the pH of the extraction solution. It was concluded that checking postextraction pH is an effective way to identify samples that should be rerun by using a smaller sample size. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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