CATALYTIC KINETIC SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF IODINE

摘要

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%.View full textDownload full textKeywordscatalytic kinetic spectrophotometry, iodine, potassium periodate, rodamin BRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/10739141003591418