Sample Workup Interfaced with Flow System in Flow-Reversal Mode for the Determination of Boric Acid in Adulterated

摘要

A mechanical method for the direct determination of boric acid in shellfish is proposed. The sample is weighed, placed in a sample vessel inserted in the flow system, and treated with warm water in order to release the analyte, which is extracted intothe aqueous solution. The solution is then continuously filtered to clean the aqueous solution and obtain a clear medium that is processed in the flow system to determine boric acid by spectrophotometrically monitoring its reaction with azomethine H. The determination method is based on the flow-reversal mode and allows the determination of the analyte at the microgram-per-milliliter level with a relative standard deviation between ±3% and ±4% and a throughput of 30 samples h~(-1).