Colorimetric Determination of Chlorates in Well Waters

Urone, Paul; Bonde, Erik K.

doi:10.1021/ac60168a034

Cited by 24 publications

(23 citation statements)

References 6 publications

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“…Simpler spectrophotometric methods for chlorate detection are, in theory, amenable for field use. These methods are generally based on bleaching the color of a dye species [6,[11][12][13][14] or the catalyzed generation of colored triiodide anion [15][16][17][18] in the presence of chlorate. The color change may be visible to the naked eye or with the aid of very simple instrumentation, permitting development of a lightweight system that requires little or no power to operate.…”

Section: Introductionmentioning

confidence: 99%

Statistical evaluation of an electrochemical probe for the detection of chlorate

Trammell

Shriver‐Lake

Dressick

2017

Sensors and Actuators B: Chemical

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We describe the use and characterization of a multilayer film, prepared via layer-by-layer deposition of cationic para-rosaniline acetate dye (i.e., PR) and the vanadium-containing Keggintype polyoxometalate anion, [PMo 11 VO 40 ] 5 (i.e., PVMo 11 ), on indium tin oxide (ITO) as an electrode for determination of chlorate. A linear cyclic voltammetry (CV) current response was observed for the 0 M  [ClO 3  ]  1000 M range with a detection limit of ~220 M ClO 3  (S/N > 3) in a pH = 2.5 solution of 100 mM sodium acetate. Electrode response was insensitive to interference by oxygen and nitrogen-based explosives like TNT, a prerequisite for use in the field. A Taguchi L16 array was used to investigate the performance of the electrode as functions of number of PVMo 11 /PR bilayers (L; 3-6 bilayers), solution pH (H; pH ~1.32 -2.85), solution [ClO 3  ] (C; 250 -1000 M), CV scan rate (S; 50-200 mVs 1 ), and film age (A; 1-8 weeks). Maximum current response was obtained for a 1 week old 5 bilayer film immersed in a pH 2.85 0.10 M NaCl (aq) solution containing 1000 M ClO 3  . However, current response fell as films aged, requiring aging of films for approximately 8 weeks prior to use to obtain reproducible analyses. A two-level full factorial design using films aged 8 weeks identified the variables S, L, H, and C and variable interactions LS and HS as statistically significant contributors to the film current response and provided a model describing film performance.

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Section: Introductionmentioning

confidence: 99%

Statistical evaluation of an electrochemical probe for the detection of chlorate

Trammell

Shriver‐Lake

Dressick

2017

Sensors and Actuators B: Chemical

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“…The resulting chlorine reacts with o-tolidine to generate a color change ( Figure S5a, Supporting Information). [26] This reaction design has been demonstrated to be selective for most substances. Cupric tetrapyridine perchlorate was studied and determined to be an effective means of identifying perchlorate ions based on purple precipitates ( Figure S5b, Supporting Information).…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

“…For detecting chlorate, an effective colorimetric reaction was implemented based on a mechanism in which chlorate ions react with chloride in a highly acidic solution. The resulting chlorine reacts with o‐tolidine to generate a color change (Figure S5a, Supporting Information) . This reaction design has been demonstrated to be selective for most substances.…”

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confidence: 98%

A Colorimetric Artificial Olfactory System for Airborne Improvised Explosive Identification

Wang

Cai

et al. 2020

Advanced Materials

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The detection of ultralow or nonvolatile target analytes remains a significant challenge for artificial olfactory systems even after decades of development, which severely limits their widespread application. To overcome this challenge, an artificial olfactory system based on a colorimetric hydrogel array is constructed for the first time as a universal representative. As an effective extension of conventional artificial olfactory systems that integrates the merits of its predecessors, the proposed system accurately mimics olfactory mucosa and specific odorant binding proteins using hydrogels endowed with specific colorimetric reagents for the detection of hypochlorite, chlorate, perchlorate, urea, and nitrate. Therefore, the proposed system is capable of detecting and discriminating between these five airborne improvised explosive microparticulates with a detection limit as low as 39.4 pg. Additionally, the system demonstrates good reusability over ten cycles, rapid response time of ≈0.2 s, and excellent discrimination properties, despite significant variation. This proof‐of‐concept study on colorimetric artificial olfactory systems yields a novel strategy for the direct and discriminative detection of nonvolatile airborne microparticulates.

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“…All the purification steps were carried out at 25 ºC following the protocol previously described [20]. The chlorate reductase activity of the NarGH was measured using two different methods: i) colorimetric o-toluidine assay, which allows chlorate quantification [27] and ii) methylviologen method (substratedependent oxidation of reduced methylviologen) [28]. In order to check the effect of other anions (e.g.…”

Section: Nargh Chlorate Reductase Activitymentioning

confidence: 99%

Characterisation of chlorate reduction in the haloarchaeon Haloferax mediterranei

Martínez‐Espinosa

Richardson

Bonete

2015

Biochimica et Biophysica Acta (BBA) - General Subjects

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2Background: Haloferax mediterranei is a denitrifying haloarchaeon using nitrate 3 as a respiratory electron acceptor under anaerobic conditions in a reaction 4 catalysed by pNarGH. Other ions such as bromate, perchlorate and chlorate can 5 also be reduced. 6Methods: Hfx. mediterranei cells were grown anaerobically with nitrate as 7 electron acceptor and chlorate reductase activity measured in whole cells and 8 purified nitrate reductase. 9

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Colorimetric Determination of Chlorates in Well Waters

Cited by 24 publications

References 6 publications

Statistical evaluation of an electrochemical probe for the detection of chlorate

Statistical evaluation of an electrochemical probe for the detection of chlorate

A Colorimetric Artificial Olfactory System for Airborne Improvised Explosive Identification

Characterisation of chlorate reduction in the haloarchaeon Haloferax mediterranei

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