Determination of iodide by derivatization to 4-iodo-N,N-dimethylaniline and gas chromatography–mass spectrometry

Mishra, Sanjeev; Singh, Vandana; Jain, Archana; Verma, Krishna K.

doi:10.1039/a908363d

Cited by 42 publications

(27 citation statements)

References 33 publications

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“…Ten-millilitre aliquots of seawater were analysed for iodide and for total iodine; iodate was calculated by difference. The method for iodide derivatization was slightly changed from the one described by Mishra et al (2000). The use of sodium hydrogen sulfite as an agent to reduce iodate to iodide is described by Schwehr and Santschi (2003).…”

Section: Iodide and Iodate Measurementsmentioning

confidence: 99%

Emission of iodine-containing volatiles by selected microalgae species

et al. 2014

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Abstract. In this study we present the results of an emission study of different phytoplankton samples in aqueous media treated with elevated ozone levels. Halocarbon measurements show that the samples tested released bromoform and different iodocarbons, including iodomethane, iodochloromethane and diiodomethane. Iodide and iodate levels in the liquid phase were representative of concentrations of surface water in a natural environment. Measurement of volatile iodine (I 2 ) emissions from two diatom samples (Mediopyxis helysia and Porosira glacialis) and the background sample (F/2 medium from filtered natural seawater) showed that the quantity of evolved I 2 depends on the ozone concentration in the air. This behaviour was assumed to be caused by the oxidation reaction mechanism of iodide with ozone. The I 2 emission flux agrees with model calculations at different iodide concentrations. The I 2 emission of a natural plankton concentrate sample was, however, very low compared to other samples and showed no dependence on ozone. The reason for this was shown to be the low iodide concentration in the algal suspension, which seems to be the limiting factor in the oxidative formation of I 2 .

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Section: Iodide and Iodate Measurementsmentioning

confidence: 99%

Emission of iodine-containing volatiles by selected microalgae species

et al. 2014

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“…Besides, previous research regarding the formation and decay of FC and FB were either conducted in separate synthetic systems, 16 or expressed by their total concentration 17,18 due to a lack of suitable detection methods. Conversion of halogen species into organic derivatives by appropriate derivatization agents provides one way to resolve this problem, and pre-column derivatization followed by chromatographic quantification has been used to detect chlorine, 19,20 bromate and bromide, 21,22 iodine, iodate and iodide 21,23 in various matrixes. One method adopting pre-column derivatization and liquid chromatography (LC) quantification has recently been established to simultaneously analyze FC and FB in ballast water.…”

Section: Introductionmentioning

confidence: 99%

Monitoring free chlorine and free bromine in aquarium seawater treated by ozone

et al. 2012

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Free chlorine (FC) and free bromine (FB) produced during ozonation treatment of aquarium seawater pose a serious threat to the health of ornamental aquatic animals, but little is known about the concentration levels of these chemicals in aquarium facilities. In this study, a highly selective and sensitive analytical method based on the derivatization of FC and FB to corresponding 4-halo-2,6-dimethylphenols by 2,6-dimethylphenol was developed. The formed halo-derivatives were extracted by hexane and subsequently quantified by gas chromatography-mass spectrometry. The calibration curves showed good linearity (r 2 > 0.999) in a broad concentration range of 2.1-4200 mg L À1 for FC and 3.3-1700 mg L À1 for FB. The method detection limits (S/N ¼ 3) were determined to be 62.7 and 71.6 ng L À1for FC and FB, respectively. The developed method exhibited good recovery, selectivity, precision and was successfully applied to monitor the formation and decay of FC and FB in ozonated seawater. During the ozonation process, the formation of FB dominated, while much less chloride was oxidized to FC; FB decayed much faster than FC. The concentrations of FC and FB in various animal tanks of Beijing Aquarium were also monitored. The results show that 30.1-56.4 mg L À1 FC and 26.5-730.7 mg L À1 FB were present in aquarium tanks, revealing that the health of aquatic animals (particularly fish, jellyfish, and coral) was under severe threat.

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“…The stable product, 4-iodo-N,Ndimethylaniline, is extracted with cyclohexane and analyzed by gas chromatography-mass spectrometry (GC-MS). Iodate can be determined after reduction to iodide with ascorbic acid (Mishra et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Analysis of iodide and iodate in Lake Mead, Nevada using a headspace derivatization gas chromatography–mass spectrometry

Dorman

Steinberg

2009

Environ Monit Assess

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We report here a derivatization headspace method for the analysis of inorganic iodine in water. Samples from Lake Mead, the Las Vegas Wash, and from Las Vegas tap water were examined. Lake Mead and the Las Vegas Wash contained a mixture of both iodide and iodate. The average concentration of total inorganic iodine (TII) for Lake Mead was approximately 90 nM with an iodide-to-iodate ratio of approximately 1. The TII concentration (approximately 160 nM) and the ratio of iodide to iodate were higher for the Las Vegas Wash (approximately 2). The TII concentration for tap water was close to that of Lake Mead (approximately 90 nM); however, tap water contained no detectable iodide as a result of ozonation and chlorine treatment which converts all of the iodide to iodate.

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Determination of iodide by derivatization to 4-iodo-N,N-dimethylaniline and gas chromatography–mass spectrometry

Cited by 42 publications

References 33 publications

Emission of iodine-containing volatiles by selected microalgae species

Emission of iodine-containing volatiles by selected microalgae species

Monitoring free chlorine and free bromine in aquarium seawater treated by ozone

Analysis of iodide and iodate in Lake Mead, Nevada using a headspace derivatization gas chromatography–mass spectrometry

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