Title: CATALYTIC KINETIC SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF IODINE
Abstract: A new catalytic kinetic spectrophotometric method has been established for the determination of iodine using the principle that potassium periodate oxidize rhodamine B (RhB) to discolor and I − has a catalytic effect on the reaction. The maximum absorption peak of I −–RhB–KIO4 system locates at 556 nm in the medium of 0.16 mol/mL phosphorus acid. The absorbance difference (ΔA) is linearly related with the concentration of iodine in the range of 0 – 2.6 µg/mL and fitted the equation ΔA = 0.1578 C(C: μg/mL) + 0.0052, with a regression coefficient of 0.9965. The detection limit of the method is 7.10 ng/mL. The method was used to determine iodine in kelp, potato, tap water, and rain water samples. The relative standard deviation of 13 replicate determinations was 1.81–2.10%. The recovery of the standard addition of the method was 96.2–99.2%.
Publication Year: 2010
Publication Date: 2010-02-26
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 2
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