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Abstract
Inductively coupled argon plasma atomic emission spectroscopy (ICAP‐AES) is frequently used for analysis of soil extracts. Advantages include increased detection limits, simultaneous multi‐element capabilities, speed, and operator safety due to inert, non‐combustible source gas. Previous research showed that instrumentation problems increased with increasing salt content in soil extracting solutions. An ICAP‐AES was used to analyze AI, Mn, Ca, and Mg in KCl soil extracts under various KCl concentrations, soil: solution ratios, and shaking times for two acidic soils in Oklahoma. Changes in KCl concentration and soil: solution ratio resulted in differences in extractable Al, Mn, Ca, and Mg for both soils. Shaking time did not affect extractable Al in either soil, but did affect extractable Mn. Extractable Ca and Mg varied in one of the soils as a result of shaking time. The most effective extraction parameters selected based on these soils were 0.5M KCl, 10 min. shaking time, and 1: 15 soil: solution ratio.
Notes
Journal article 6055, Oklahoma Agricultural Experiment Station, Stillwater, OK 74078.