University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Plant -> laver

Citations 1

"Spectrophotometric Flow Injection Determination Of Trace Iodide In Table Salt And Laver Through The Reaction Of Iodate With 3,5-Br2-PADAP And Thiocyanate"
Fresenius J. Anal. Chem. 1997 Volume 357, Issue 7 Pages 1002-1005
Junying Sun, Xingguo Chen, Zhide Hu

Abstract: Cleaned, dried laver (2 g) was mixed with 10 mL 2 M KOH, dried at 80-100°C for 1-2 h, charred for 2-3 h, ashed for 4-5 h and the residue was dissolved in water with heating. A portion (10 ml) of prepared solution of 0.4 mg/ml table salt solution was mixed with 1 mL H3PO4 solution and 1 mL saturated Br2 solution, the mixture was heated to remove Br2 and then diluted to 50 mL with water. Portions (100 µL) were injected into a water stream (0.8 ml/min) which merged with a stream (0.8 ml/min) of 0.004% 2-(3,5-dibromo-2-pyridylazo)-5-diethylamino-phenol (3,5-Br2-PADAP) in 4.5 M H2SO4, passed through a mixing coil (12 cm x 0.5 mm i.d.), merged with a stream (0.8 ml/min) of 10 mM KSCN and passed through a reaction coil (90 cm x 0.5 mm i.d.) prior to detection at 605 nm. Beer's law was obeyed from 1-24 µM-iodide, the detection limit was 0.5 µM and recoveries were 98-104%. RSD are not stated. The sample throughput was 80/h. The tolerance levels of various interferents were determined (results presented). The reaction mechanism is discussed.
Iodide Spectrophotometry Interferences