Abstract
Rapid and accurate method for analysis of major elements in soils by Lithium Metaborate Fusion ICP-AES was studied. The procedure established is summarized as follows. Mix 50 mg of finely powdered soil sampled and 100 mg of lithium metaborate in platinum crucible. Fuse the mixture in muffle furnace at 1,000℃ for 10 min. After cooling, transfer the crucible into a 30 ml tall beaker, and add a Teflon-coated stirring bar and 10 ml of 1 M nitric acid. Stir gently for dissolution of the melt in water bath with magnetic stirring unit at 60℃ for 10 min. Quantitatively transfer the dissolved melt to a 100 ml volumetric flask, and dilute to volume by water after cooling to room temperature. prepare blank and standard solutions form standard rock such as JG-1 or JB-1 in the same way as the sample, and analyze Si, Ti, Al, Fe, Mn, Mg, Ca, Na, K, and P by ICP-AES. The total time of analysis was about 30 min for dissolution and about 5 min for ICP-AES measurement. The accuracy of this method was confirmed by analysis of reference standard soils (SO-1〜4).
