This method quantitatively extracts soluble potassium (K) present in botanical materials by extraction with a solution of 2% acetic acid. Potassium is quantitatively determined in the extract using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). Concentration of potassium is used to assess plant overall nutrient status and is correlated to plant response to potassium fertilization. The method has a routine detection limit of 0.01% (dry basis).
Sample amount requested: 3 g
Questions concerning limited sample size can be answered by the UC Davis Analytical Laboratory.
Jones, Jr. J. Benton. 2001. Laboratory Guide for Conducting Soil tests and Plant Analysis. Extraction of Cl, NO3, PO4, K, and SO4 from Plant Tissue. pp. 228-229.
U.S. EPA Method 200.7, Trace Elements in Water, Solids, and Biosolids by Inductively Coupled Plasma-Atomic Emission Spectrometry.