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Reverse flow injection analysis determination of trace amounts of metals using an on line preconcentration technique


, : Reverse flow injection analysis determination of trace amounts of metals using an on line preconcentration technique. Microchemical Journal 40(3): 277-285

Determination of metal ion concentrations by reversed flow injection analysis using precipitation as a preconcentration technique is presented. The precipitate formed from the reaction of the cation and the anion, in a Tygon tube containing glass beads connected to the atomic absorption spectrophotometer, is dissolved by injection of a solution of a suitable dissolving reagent. The dissolving reagent dissolves the precipitate and the cation is transported to the atomic absorption spectrophotometer, yielding the signal. Three cations were tested to demonstrate the feasibility of the procedure; silver, calcium, and iron which were precipitated as silver chloride, calcium carbonate, and ferric hydroxide, respectively. Three dissolving reagents were investigated with silver chloride precipitate: ammonia, thiosulfate ion, and cyanide ion. Three other reagents were also used to dissolve ferric hydroxide pricipitate: hydrochloric acid, phosphoric acid, and nitric acid. One reagent, hydroxhloric acid, was used as a dissolving agent for calcium carbonate precipitate. Detection limits were 5 .times. 10-3, 4 .times. 10-2, and 8 .times. 10-4 ppm, respectively, for silver, iron, and calcium using thiosulfate, phosphoric acid, and hydrochloric acid as respective dissolving agents. The method could be applied easily to many routine analyses, such as water analysis due to its rapidity, precision, and small reagent consumption.

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