A compact multi-parameter detection system based on hydrodynamic sequential injection for sensitive determination of phosphate, nitrite, and nitrate in water samples

Khongpet, Wanpen; Yanu, Pattama; Pencharee, Somkid; Puangpila, Chanida; Hartwell, Supaporn Kradtap; Lapanantnoppakhun, Somchai; Yodthongdee, Yutdanai; Paukpol, Autchara; Jakmunee, Jaroon

doi:10.1039/c9ay02327e

Cited by 9 publications

(2 citation statements)

References 37 publications

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“…Although the VCl 3 reduction method has been frequently reported in recent years, with the advantage of decreased toxicity (Lin et al, 2019;2022), the coppered cadmium (Cu/Cd) reduction method is still the most commonly used reduction technique for nitrate determination (Singh et al, 2019). Since the cadmium column was first used in seawater for nitrate determination in 1967 (Wood et al, 1967), the application of the Cu/Cd column has been widely promoted not only in commercial instruments but also in new development methods or instruments (Nugraha and Ridwan, 2019;Khongpet et al, 2020). In the cadmium granule coppered process, cadmium is oxidized to the Cd 2+ cation, and Cu 2+ is reduced to metallic copper, which precipitates on the cadmium surface as a porous coating layer (Pons et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Field determination of nitrate in seawater using a novel on-line coppered cadmium column: A comparison study with the vanadium reduction method

Niu

Li²,

Guo³

et al. 2023

Front. Mar. Sci.

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Nitrate is the main form of dissolved inorganic nitrogen, playing an important role in both marine biogeochemical research and water environment management. In this work, the most commonly used coppered cadmium column was modified and a novel on-line Cu/Cd column with a spiral structure coupled with a de-bubbling device and syringe-type filter was developed. With the advantages of convenience, portability, stability, and high reduction efficiency, the interference of air bubbles in the column could easily be avoided. Based on the classic Griess reaction, a simple reverse flow injection system coupled with a novel Cu/Cd column and custom-made flow cell was established for the field spectrophotometric determination of nitrate in seawater. The effects of certain reaction parameters—including the reagent concentration, flow rate, length of the Cu/Cd column, and salinity—were investigated, optimized, and compared with pure water, with an approximate 9% increase in the sensitivity of seawater samples. This method exhibited a detection limit of 0.03 μmol/L, with a relative standard deviation of 0.6%, and the working range was 20 μmol/L before dilution. Compared to the referred vanadium reduction method based on the same flow system, the proposed method showed significant advantages including sensitivity and reproducibility. No significant difference was observed between the analytical seawater sample results obtained by the proposed and reference methods. Furthermore, the proposed method was validated by the first class of National Certified Reference Materials and successfully applied to the nitrate determination of Wenling coastal seawater (Zhejiang, China).

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Section: Introductionmentioning

confidence: 99%

Field determination of nitrate in seawater using a novel on-line coppered cadmium column: A comparison study with the vanadium reduction method

Niu

Li²,

Guo³

et al. 2023

Front. Mar. Sci.

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“…Ideally, the analytical analyzer for on-site or in-situ monitoring should be compact, robust, cost-effective, and environmentally compatible with the ability to deliver reliable measurements over prolonged periods of time [8]. A wide range of different analytical methods have been applied for in-situ sensor development for water monitoring, including chemiluminescence [9], electrochemistry [10,11], and colorimetry [12,13]. Several electrochemical sensor prototypes of promise have been developed for phosphate detection in water [14,15].…”

Section: Introductionmentioning

confidence: 99%

Ion chromatograph with three‐dimensional printed absorbance detector for indirect ultraviolet absorbance detection of phosphate in effluent and natural waters

Lace

Byrne

Bluett

et al. 2022

J of Separation Science

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An ion chromatography system employing a low‐cost three‐dimensional printed absorbance detector for indirect ultraviolet detection towards portable phosphate analysis of environmental and industrial waters has been developed. The optical detection cell was fabricated using stereolithography three‐dimensional printing of nanocomposite material. Chromatographic analysis and detection of phosphate were carried out using a CS5A 4 × 250 mm analytical column with indirect ultraviolet detection using a 255 nm light‐emitting diode. Isocratic elution using a 0.6 mM potassium phthalate eluent combined with 1.44 mM sodium bicarbonate was employed at a flow rate of 0.75 mL/min. A linear calibration range of 0.5 to 30 mg/L PO43− applicable to environmental and wastewater analysis was achieved. For retention time and peak area repeatability, relative standard deviation values were 0.68 and 4.09%, respectively. Environmental and wastewater samples were analyzed with the optimized ion chromatography platform and the results were compared to values obtained by an accredited ion chromatograph. For the analysis of environmental samples, relative errors of <14 % were achieved. Recovery analysis was also carried out on both freshwater and wastewater samples and recovery results were within the acceptable range for water analysis using standard ion chromatography methods.

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Fabrication of Electrochemical Nanosensor for Detection of Nitrate Content in Soil Extract

Kundu

Krishnan

Chobhe

et al. 2022

J Soil Sci Plant Nutr

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A compact multi-parameter detection system based on hydrodynamic sequential injection for sensitive determination of phosphate, nitrite, and nitrate in water samples

Abstract: A miniaturized microfluidic hydrodynamic sequential injection system for sensitive colorimetric detection was developed for performance improvement in the measurement of phosphate, nitrite, and nitrate based on molybdenum blue and Griess methods.

Cited by 9 publications

References 37 publications

Field determination of nitrate in seawater using a novel on-line coppered cadmium column: A comparison study with the vanadium reduction method

Field determination of nitrate in seawater using a novel on-line coppered cadmium column: A comparison study with the vanadium reduction method

Ion chromatograph with three‐dimensional printed absorbance detector for indirect ultraviolet absorbance detection of phosphate in effluent and natural waters

Fabrication of Electrochemical Nanosensor for Detection of Nitrate Content in Soil Extract

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