Dry Ash Procedure for P, K, Ca, Mg, Zn, Cu, Fe
- 1 N HYDROCHLORIC ACID - Dilute 83.3 mL conc. HCl to 1 L Deionized H20.
- 6 N HYDROCHLORIC ACID - Dilute 50 mL conc. HCl to 100 mL deionized H20.
- MUFFLE FURNACE
- "HIGH FORM" PORCELAIN CRUCIBLES
- 100 mL VOLUMETRIC FLASKS
- 13 X 100 mm FLINT GLASS TEST TUBES
- Weigh 1.000 g sample into "high form" porcelain crucible.
- Place sample into furnace and increase temperature gradually until temperature reaches 500oC.
- Ash for 3 h after reaching temperature.
- Wet sample with a small amount of dH20, then add 5-10 mL of 6 N HCl and bring to near dryness on hot plate.
- Dissolve ash by adding 10 mL 1 N HCl to crucible.
- Quantitatively transfer dissolved ash into 100 mL volumetric flasks.
- Wash down sample with dH20.
- Dilute to volume with dH20 and shake.
- Place aliquot into ICP test tube.
- Ellis, R. J., Jr., J. J. Hanway, G. Holmgren, D. R. Keeney, and O. W. Bidwell. Sampling and Analysis of Soils, Plants, Waste Waters, and Sludge-Suggested Standardization and Methodology. Agricultural Exp. Station, Kansas State University, Manhattan, Res. Pub. 170. North Central Regional Pub. 230.
- Haynes, R. J. 1980. A Comparison of Two Modified Kjeldahl Digestion Techniques for Multi-Element Plant Analysis with Conventional Wet and Dry Ashing Methods. Comm. in Soil Sci. and Plant Anal. 11(5): 459-467.