Flow injection for iodide determination at the ppb level

Chantore, W.; Muangkaew, S.; Shiowatana, Juwadee; Nacapricha, Duangjai

doi:10.1002/(sici)1098-2728(1999)11:1<37::aid-lra5>3.0.co;2-5

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…The configuration of the FI system used in the continuous mode was modified from the system reported in previous work 22 and is shown in Fig. 1.…”

Section: Manifolds For Continuous and Stopped Flow Injectionmentioning

confidence: 99%

“…Interferences of diverse species which potentially exist in urine (Cl 2 , SO 4 22 , HCO 3 2 , Ca 2+ , K + , Mg 2+ , SCN 2 , Fe 3+ , F 2 , Mn 2+ , (NH 4 ) 2 HPO 4 , glucose, urea, oxalic acid, uric acid and ascorbic acid) were examined.…”

Section: Interferent Studiesmentioning

confidence: 99%

“…Chantore et al 22 have found that raising the temperature of the reaction zone can increase the sensitivity. For the continuous-FI system, the effect of temperature on sensitivity was studied at two bath temperatures.…”

Section: Optimization Of Fi Parametersmentioning

confidence: 99%

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Continuous and stopped flow injection for catalytic determination of total iodine in urine

Nacapricha

Muangkaew

Ratanawimarnwong

et al. 2001

Analyst

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This paper describes the use of flow injection (FI) techniques for the determination of iodine in urine, based on the catalytic effect of iodide in the redox reaction between Ce(IV) and As(III). The proposed procedures minimize errors in the conventional batch method arising from the reading of absorbance at a fixed time after addition of Ce(IV) reagent. Two FI systems, for the continuous and stopped modes of operation were assembled. In the continuous-FI system, a thermostated bath was used to increase the sensitivity. However this is not necessary for the stopped-FI system. The two systems are comparable in terms of sensitivity, sample throughput and detection limit. The continuous-FI and the stopped-FI exhibited detection limits (3 sigma) of 2.3 and 3 micrograms I l-1 respectively. Both systems have equal sample throughputs of 35 samples h-1. Calibration plots for both techniques are linear. The FI procedures provide very short analysis times compared to the batch procedure. Using the linear regression test, there is no significant difference between the results from the four methods, i.e., continuous-FI, stopped-FI, conventional method and ICP-MS. The proposed methods are readily applicable for automation and can be an alternative to the conventional procedure for the survey of the iodine deficiency disorder. A condition for sample digestion is also proposed to reduce the amount of chloric acid required for complete digestion. Kinetic information of the reaction can also be obtained from the stopped flow mode.

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“…The configuration of the FI system used in the continuous mode was modified from the system reported in previous work 22 and is shown in Fig. 1.…”

Section: Manifolds For Continuous and Stopped Flow Injectionmentioning

confidence: 99%

Section: Interferent Studiesmentioning

confidence: 99%