Determination of Total Dissolved Aluminum in Seta River Water by Flow Injection Fluorometry with Aluminum-Lumogallion Complex after Acid Digestion

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The total dissolved aluminum in the Seta River water was determined by flow-injection fluorometryusing the aluminum-lumogallion complex after its digestion by a mixture of nitric acid and hydrofluoric acid. The sample decomposition system, which was hard to be contaminated by aluminum from the air, was constructed and used successfully to produce reproducible values. By subtractingthe concentration of dissolved reactive aluminum, the concentration of the non-reactive aluminum was estimated. The concentration change in the total dissolved aluminum from the Seta River water for one year was reported, together with that of the dissolved reactive aluminum. The concentration of total dissolved aluminum was usually between 0.2 and 0.5μM, however, it increased to 1.87μM after typhoon no.12 of 2011 has passed through the Shiga prefecture. Unexpectedly, hydrofluoric acid was not necessary for the complete decomposition of the aluminum species in the Seta River water. However, hydrofluoric acid was indispensable for the complete recovery of aluminum from a clay mineral, i. e., montmorillonite. We found that even the small amount of fluoride (about the same concentration as that originally present in Seta River water) was effective for the decomposition of the montmorillonite. The determined values of the total dissolved aluminum showed a good correlation to the results obtained from GFAAS.
2013-03-00