Simple flow injection system for colorimetric determination of iodate in iodized salt

Choengchan, Nathawut; Uraisin, Kanchana; Choden, K; Veerasai, Waret; Grudpan, Kate; Nacapricha, Duangjai

doi:10.1016/s0039-9140(02)00438-1

Cited by 30 publications

(12 citation statements)

References 9 publications

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“…Previous reported methods employ volumes from 500 -2600 μL per analysis. 14,15,18,20,21 This method also employs an on-line reduction process of the iodate ion using the same As(III) reagent employed in the iodide analysis. A stopped-flow procedure provided the sensitivity for analysis of total inorganic iodine (iodide and iodate ions) in natural drinking water without the need for heating the system.…”

Section: Discussionmentioning

confidence: 99%

“…There are a variety of methods reported in the literature for measurement of trace iodine. 7 These methods are based on principles such as electrochemistry, [8][9][10] separation techniques, 11 chemiluminescence, 12,13 spectrophotometry [14][15][16][17][18][19][20][21] and spectrofluorometry. 22 Although conventional ICP techniques 23 have been employed for iodine measurement, it requires high-cost instrumentation, high maintenance costs, with low sample analysis throughput.…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been developed employing flow-based techniques, which were previously reported to achieve sensitive detection of iodine in an automated manner. Measurement of iodine content in various sample matrices including pharmaceuticals, [13][14][15] urine, 10,[16][17][18][19] seawater specimens, 15,22 iodized salts, 10,20 plant, 9 and drinking water. 14,21 Most of these methods utilized the Sandell-Kolthoff reaction 24 in which iodide catalyzed the redox reaction between Ce(IV) and As(III) due to its sensitivity for detection of very low levels of iodide (parts per billion) (see Table 1).…”

Section: Introductionmentioning

confidence: 99%

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Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

et al. 2018

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A microfluidic method with front-face fluorometric detection was developed for the determination of total inorganic iodine in drinking water. A polydimethylsiloxane (PDMS) microfluidic device was employed in conjunction with the Sandell-Kolthoff reaction, in which iodide catalyzed the redox reaction between Ce(IV) and As(III). Direct alignment of an optical fiber attached to a spectrofluorometer was used as a convenient detector for remote front-face fluorometric detection. Trace inorganic iodine (IO3 -and I -) present naturally in drinking water was measured by on-line conversion of iodate to iodide for determination of total inorganic iodine. On-line conversion efficiency of iodate to iodide using the microfluidic device was investigated. Excellent conversion efficiency of 93 -103% (%RSD = 1.6 -11%) was obtained. Inorganic iodine concentrations in drinking water samples were measured, and the results obtained were in good agreement with those obtained by an ICP-MS method. Spiked sample recoveries were in the range of 86%(±5) -128%(±8) (n = 12). Interference of various anions and cations were investigated with tolerance limit concentrations ranging from 10 -6 to 2.5 M depending on the type of ions. The developed method is simple and convenient, and it is a green method for iodine analysis, as it greatly reduces the amount of toxic reagent consumed with reagent volumes in the microfluidic scale.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

et al. 2018

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“…Düşük derişimlerde iyodür tayini için donanımı pahalı, kullanımı için tecrübeli personele ihtiyaç duyulan, numunelerin bazı ön işlemlerle analize hazırlanmasını gerektiren ve analiz süresi uzun olan amperometrik [2], spektrometrik [3][4][5][6][7], kromatografik [8][9][10], voltametrik [11], kemilüminesans [12] ve akış enjeksiyon analizi [13][14][15][16] gibi çeşitli enstrümantal analiz yöntemleri bulunmaktadır.…”

Section: Introductionunclassified

Paladyum Komplekslerine Dayalı İyodür-Seçici Karbon Pasta Elektrot Hazırlanması

Özel¹,

Muratoğlu²,

Ertürün³

2017

SDÜ Fen Bil Enst Der

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Anahtar KelimelerKarbon pasta elektrot, İyodür-seçici elektrot, Potansiyometri, Paladyum kompleksleri Özet: Dibromo[1,1′-bis(difenilfosfin)ferrosen] paladyum(II) (iyonofor I) ve dikloro[1,1′-bis(difenilfosfin)ferrosen] paladyum(II) (iyonofor II) olarak adlandırılan paladyum komplekslerinin kullanıldığı yeni iyodür-seçici karbon pasta elektrotlar hazırlandı. İyonofor I ve II kullanılarak optimum karbon pasta bileşimiyle hazırlanan elektrotların pH 4,0'da sırasıyla −43,2 ± 0,6 mV/pI ve −43,8 ± 0,6 mV/pI eğimle, 3,5×10 −6 M ve 3,7×10 −7 M gözlenebilme sınırıyla, 1,0×10 −5 − 1,0×10 −1 M ve 1,0×10 −6 − 1,0×10 −1 M derişim aralığında doğrusal cevap verdikleri gözlendi. Önerilen elektrotların kısa cevap sürelerine, 3 aylık ömre, iyi bir tekrarlanabilirlik ve üretilebilirliğe sahip oldukları bulundu. Ayrıca, elektrotlar, iyodür içeren ilaç numunelerinde iyodürün potansiyometrik tayini için indikatör elektrot olarak başarılı bir şekilde kullanıldı. Preparation of Iodide-Selective Carbon Paste Electrode Based on Palladium ComplexesKeywords Carbon paste electrode, Iodide-selective electrode, Potentiometry, Palladium complexes Abstract: New carbon paste iodide-selective electrodes based on palladium complexes named as dibromo[1,1′-bis(diphenylphosphino)ferrocene] palladium(II) (ionophore I) and dichloro[1,1′-bis(diphenylphosphino)ferrocene] palladium(II) (ionophore II) were developed. The electrodes, prepared with optimum carbon paste composition by using ionophore I and II exhibited linear response with slopes of −43.2 ± 0.6 and −43.8 ± 0.6 mV/pI, detection limits of 3.5×10 −6 M and 2.9×10 −6 M at pH 4.0 over the concentration range of 1.0×10 −5 − 1.0×10 −1 M and 1.0×10 −6 − 1.0 × 10 −1 M, respectively. The proposed electrodes were found to have short response times, lifetime of three months, good reproducibility and repeatability. Moreover, the electrodes were successfully used as an indicator electrode for the potentiometric determination of iodide in an iodide containing drug sample.

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“…Distintos protocolos têm sido elaborados para a análise de iodato, tais como, espectrofotometria [1,[10][11][12][13][14][15][16][17][18][19][20][21]; métodos em FIA [22][23][24][25][26][27]; cromatografia iônica [28,29]; cromatografia gasosa [2,30]; cromatografia liquida [31]; eletroquímica [23,24,[32][33][34][35][36][37] e quimiluminescência [38].…”

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Análise de iodato em sais de cozinha

et al. 2011

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Iodato pode ser reduzido em solução tampão B-R pH 2,0 por ação da hidroxilamina. Dependendo da concentração do agente redutor é possível gerar iodo molecular ou o complexo triiodeto. Iodo apresenta um conjunto de três picos de absorção, enquanto o complexo somente dois na região do ultravioleta. Utilizando excesso de hidroxilamina é possível monitorar o triiodeto em max. 352 nm e max. 288 nm. Empregando as melhores condições experimentais, curvas de calibração lineares entre 2,3x10-4 mol L-1 a 5,0x10-4 mol L-1 foram obtidas para a determinação de iodato. A metodologia foi aplicada em amostras de sais de cozinha de supermercados da cidade de Natal, RN.

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Simple flow injection system for colorimetric determination of iodate in iodized salt

Cited by 30 publications

References 9 publications

Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

Paladyum Komplekslerine Dayalı İyodür-Seçici Karbon Pasta Elektrot Hazırlanması

Análise de iodato em sais de cozinha

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