Determination of Nitrite by Flow Injection Spectrophotometry Using a Home-made Flow Cell Detector

Hirata, Shizuko; Amma, Bhavaniamma Vijayalekshmi; Karthikeyan, Sathrugnan; Toda, Kei

doi:10.2116/analsci.19.1687

Cited by 18 publications

(9 citation statements)

References 22 publications

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“…hydrochloric acid (Wako) in 200 ml of water. 11 The copperized cadmium for the column was prepared by mixing 1 g of 2 -40 mesh cadmium with 25 ml of 2% (w/v) copper sulfate solution for 2 min, draining off the supernatant and rinsing with Milli-Q water. This was followed by mixing with 25 ml of 2 M hydrochloric acid for 2 min, draining off the supernatant and rinsing with Milli-Q water, then washing with 1% (w/v) ammonium chloride solution.…”

Section: Reagents and Chemicalsmentioning

confidence: 99%

“…A detailed description of the flow-through absorbance detector was reported in our previous research. 11 In the case of nitrate, it was reduced on-line to nitrite using a copperized cadmium column prior to a colorimetric reaction of nitrite. Two six-port injection valves were connected in parallel and a cadmium column was inserted in between, as shown in Fig.…”

Section: (Received November 21 2003; Accepted January 9 2004)mentioning

confidence: 99%

“…These concentrations were chosen from our previous optimization studies, 11 and found to be suitable for the present experiments. The instrument description and optimized analytical parameters are given in Table 1.…”

Section: Laboratory Optimizationmentioning

confidence: 99%

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Portable Flow-Injection Analyzer for Nitrite and Nitrate in Natural Water

Karthikeyan

Kajiya

2004

ANAL. SCI.

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Section: Reagents and Chemicalsmentioning

confidence: 99%

Section: (Received November 21 2003; Accepted January 9 2004)mentioning

confidence: 99%

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Portable Flow-Injection Analyzer for Nitrite and Nitrate in Natural Water

Karthikeyan

Kajiya

2004

ANAL. SCI.

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“…Flow systems for the water quality testing have been reported in several papers (Hirata et al, 2003, Steimle et al, 2002, Greenway et al, 1999, Moorcroft et al, 2001, Burakham et al, 2004 to solve these problems. In particular, micro-systems for chemical analysis, i.e., micro total analysis systems (μ-TAS), have attracted attention as a new approach (Manz, et al, 1990, Cefai, et al, 1994, Verpoorte et al, 1994.…”

Section: Introductionmentioning

confidence: 99%

Fundamental study on compact absorptiometer for water quality testing

Matsuzawa

Asano

Morita

2015

JAMDSM

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A compact absorptiometer for water quality testing that does not need a special technique to take measurements was studied where the absorbance of a sample solution could be stably measured without decreasing the sensitivity over time. Three types of devices were developed, namely, horizontal straight-line type, vertical straight-line type, and multiple reflection type, that consisted of a light emitting diode (LED), a photodiode (PD), and a glass capillary used as a sample cell. The results from our experiments conducted to detect the nitrite nitrogen in water, which is a factor in water pollution, were used to evaluate how these three devices perform. The shapes of the liquid surfaces at the end of the capillaries in the horizontal and vertical straight-line types, which had the LED, PD, and the glass capillary in line horizontally and vertically, respectively, significantly influenced the output voltage of the PD and this output significantly changed over time, so it was difficult to precisely measure the absorbance. The change in the shape of the liquid surface at the end of the capillary was particularly considerable in the horizontal straight-line type. On the other hand, in the multiple reflection type, which had reflective plates surrounding the glass capillary, the absorbance was measured quite stably because the light emitted by the LED did not transmit through the liquid surface at the end of the capillary and the output voltage of the PD was uninfluenced by the change in the shape of the liquid surface. Additionally, controlling the sensitivity of the absorbance was possible by adjusting the length of the reflective plates, i.e., adjusting the light path. The sample solution in this device did not come into direct contact with the reflective plate, so the device can suppress the decrease in the sensitivity caused by materials becoming directly attached to the reflection plate. The compact multiple reflection type device that was developed could be used in a manually operated portable absorptiometer and also in an automated water quality analysis system that incorporates mixing and flow devices.

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“…In the long list of sampling techniques for air pollutants, some of the most common are absorption in aqueous solutions (impingers, nebulizers), extraction in diffusion scrubbers (porous or permeable membrane), derivatization at solid (or liquid) sorbents packed in columns or coated on the walls of glass tubes (denuders), condensation at low temperature and cryotrapping in a solid matrix. 1,[3][4][5][6] The porous Teflon ® membrane-based diffusion scrubber (DS) was introduced by Dasgupta et al 7 in 1986. In subsequent works, porous polypropylene membranes were used as well for atmospheric gases sampling and preconcentration followed by photometric determination, mainly based on fluorescence detection.…”

Section: Introductionmentioning

confidence: 99%

Automation of an analysis system with microvolume porous membrane sampling, capillary electrophoresis separation and contactless conductivity detection for near-real-time monitoring of traces of low-molecular-weight carboxylic acids in air

Coelho

Gutz

2011

J. Braz. Chem. Soc.

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Um sistema automatizado de análise foi projetado pelo acoplamento de microamostrador difusional baseado em uma membrana capilar microporosa (CMDS) com a separação por eletroforese capilar (CE) e detecção condutométrica sem contato (C 4 D). O volume interno do CMDS, da ordem de 30 mL, combinado com a demanda de nanolitros dos equipamentos de CE-C 4 D, levou à concepção de um sistema automatizado de gerenciamento de fluido de baixo custo e livre de manutenção recorrente, baseado em bombas de aquário e válvulas de estrangulamento controladas via software, uma interface CMDS-CE de pequeno volume e um equipamento robusto de CE operado com injeção hidrodinâmica. Como exemplo de aplicação do sistema, foi demonstrada a amostragem conjunta de ácido fórmico e ácido acético no ar, com elevados fatores de pré-concentração em fase líquida, e quantificação por CE-C 4 D a uma frequência de operação ininterrupta de 10 análises completas por hora. Os limites de detecção estimados foram de 1,2 mg m -3 para o ácido fórmico e 3,0 mg m -3 de ácido acético no ar, com resposta linear no intervalo de concentração usual desses analitos em fase gasosa da atmosfera.An automatic analysis system was designed by coupling a complete microvolume sampler based on a capillary membrane diffusion scrubber (CMDS) to capillary electrophoresis (CE) equipment with capacitively coupled contactless conductometric detection (C 4 D). The microliter capacity of the CMDS, matching with the nanoliter demands of the CE-C 4 D equipment, led to the design of an automated system with fluid management based on affordable and maintenance free aquarium pumps, pinch valves under computer control, a miniaturized CMDS-CE interface and a rugged CE equipment operated with hydrodynamic injection. As an application of the system, it was successfully demonstrated that formic acid and acetic acid in air can be quantitatively sampled together, with high pre-concentration ratio, and quantified at a frequency of 10 complete analyses per hour of unattended operation, but electrolyte renewal on a daily basis. Limits of detection of 1.2 mg m -3 for formic acid and 3.0 mg m -3 for acetic acid in air, were estimated with linear response over the usual concentration range of these analytes in the gas phase of the atmosphere.

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Determination of Nitrite by Flow Injection Spectrophotometry Using a Home-made Flow Cell Detector

Cited by 18 publications

References 22 publications

Portable Flow-Injection Analyzer for Nitrite and Nitrate in Natural Water

Portable Flow-Injection Analyzer for Nitrite and Nitrate in Natural Water

Fundamental study on compact absorptiometer for water quality testing

Automation of an analysis system with microvolume porous membrane sampling, capillary electrophoresis separation and contactless conductivity detection for near-real-time monitoring of traces of low-molecular-weight carboxylic acids in air

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