Method Validation for Determination of Exchangeable Acidity in Soils

Abstract

The laboratory analyzed and determined the same type of forest soil samples at three content levels. The relative standard deviations of exchangeable acidity, exchangeable hydrogen and exchangeable aluminum in the soil were 2.26%, 2.31%, 1.72%, 10.06%, and 4.61%, respectively. %, 5.12%, 4.02%, 7.70%, 5.42%, and the actual samples were verified by the experiment, and the relative deviations of the parallel samples of exchangeable acidity, exchangeable hydrogen and exchangeable aluminum of soil samples were 1.30%, 1.03%, and 1.75%, respectively. All of them meet the determination requirements of "Determination of Soil Exchangeable Acidity by Potassium Chloride Extraction - Titration Method" (HJ 649-2013) when the measured value is <=10.0 mmol/kg, and the maximum allowable relative deviation is ±20%. It shows that the laboratory has the ability to detect the exchangeable acidity in soil.