Simultaneous determination of dissolved organic nitrogen, nitrite, nitrate and ammonia using size exclusion chromatography coupled with nitrogen detector

Ji, Wen-Xiang; Tian, Ye-Chao; Cai, Min-Hui; Jiang, Bicun; Cheng, Su‐Li; Li, Yan; Zhou, Qing; Li, Boqiang; Chen, Bai-Yang; Zheng, Xing; Li, Wentao; Li, Aimin

doi:10.1016/j.jes.2021.11.026

Cited by 26 publications

(4 citation statements)

References 32 publications

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“…(1) It can provide specific information about the EDC values of DOM fractions with different MW ranges. (2) Multiple detectors can be coupled with the SEC column to enable a more comprehensive evaluation of DOM. , (3) SEC column separation can minimize the interference from inorganic matrix constituents (e.g., Fe 2+ , HS – , and I – ), thus improving the sensitivity and accuracy of EDC measurement.…”

Section: Evolution Of Edc Analytical Methodsmentioning

confidence: 99%

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Ji,

Dong,

Wang

et al. 2024

ACS EST Water

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The redox-active moieties of dissolved organic matter (DOM) significantly influence the degradation of pollutants in oxidative water treatments. Because electron donating capacity (EDC) directly probes the redox properties of DOM, it tends to be a promising surrogate indicator to reflect changes in the DOM oxidation state. Given the complexity of applying EDC to optimizing oxidation processes, this review summarizes a history of advances in EDC analytical methods and discusses key factors for the standardization of EDC measurement. The EDC and UV 254 reductions induced by chemical oxidation are summarized to develop tailored water treatment control strategies. In addition, the applicability of EDC to indicate micropollutant abatement and disinfection byproduct formation is evaluated. Oxidative water treatments with chlorine, chlorine dioxide, permanganate, and ferrate yield a more pronounced reduction in EDC than in UV 254 due to the formation of quinone moieties, while ozonation causes a comparatively smaller EDC reduction but a larger UV 254 reduction. For oxidative water treatments in which the oxidant dosage is difficult to predict, EDC could serve as a promising surrogate indicator to meet treatment goals.

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Section: Evolution Of Edc Analytical Methodsmentioning

confidence: 99%

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Ji,

Dong,

Wang

et al. 2024

ACS EST Water

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“…First, nitrite loses its electron to form NO 2 according to eqn (8), which is accompanied by a homogenous disproportionation of NO 2 into nitrate and nitrite following eqn (9). The total reaction of nitrite conversion into nitrate can be described following the corresponding mechanism in eqn (10).…”

Section: The Effect Of Scan Rate On the Modied Electrodesmentioning

confidence: 99%

“…Numerous analytical methods have been developed for nitrite detection in several sample matrices, such as chromatography, 10,11 spectrophotometry, 12,13 uorescence, 14,15 colorimetry, 16,17 capillary electrophoresis, 18,19 surface-enhanced Raman scattering, 20,21 chemiluminescence, 22,23 and electrochemical sensors. 24,25 Nevertheless, most of the described nitrite detection techniques have limitations, such as hazardous chemical use, sophisticated instrumentation, laborious and complex sample preparation, high cost, and limited selectivity.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the analytical performance of two different electrochemical sensors based on a composite of gold nanorods with carbon nanomaterials and PEDOT:PSS for the sensitive detection of nitrite in processed meat products

Wahyuni,

Rahman,

Afifah

et al. 2024

RSC Adv.

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“…Consequently, the imperative to expeditiously investigate methodologies for the removal of these ions from water effluents has become a preeminent priority, in order to safeguard the reservoirs of the future 2 – 5 . For this purpose, multiple methods have been applied and investigated such as reverse osmosis 6 , ion exchange 7 , and chromatography 8 . The above-mentioned methods have extortionate costs and complexity; thus, other alternatives such as adsorption 9 , chemical methods 10 , biological methods 11 , and nanotechnology 12 have been heavily investigated 13 – 15 .…”

Section: Introductionmentioning

confidence: 99%

Nitrate removal study of synthesized nano γ-alumina and magnetite-alumina nanocomposite adsorbents prepared by various methods and precursors

Khatamian,

Derakhshan,

Nami

et al. 2024

Sci Rep

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The challenges in water treatment include the need for efficient removal of pollutants like nitrate, which poses significant environmental and health risks. Alumina's significance lies in its proven effectiveness as an adsorbent for nitrate removal due to its high surface area and affinity for nitrate ions. This study delves into the synthesis of differen nano-sized γ-alumina (γA1-5) employing diverse precursors and methods, including nepheline syenite, lime, aluminum hydroxide, precipitation, and hydrothermal processes at varying reaction times. Simultaneously, magnetite (Fe3O4) nanoparticles and magnetite/γ-alumina nanocomposites (Fn/γA5) were synthesized using the co-precipitation method with varying weight ratios (n). Our primary objective was to optimize γ-alumina synthesis by comparing multiple methods, shedding light on the influence of different precursors and sources. Hence, a comprehensive adsorption study was conducted to assess the materials’ efficacy in nitrate removal. This study fills gaps in the literature, providing a novel perspective through the simultaneous assessment of magnetite/alumina nanocomposites and pure alumina performance. Structural and morphological properties were studied employing XRD, FT-IR, FESEM, EDX, XRD, and VSM techniques. The conducted experiments for γA5, F5/γA5, and F10/γA5 nanocomposites showcased the optimum pH of 5 and contact time of 45 min for all samples. The influence of nitrate’s initial concentration on the removal percentage was investigated with initial concentrations of 10 ppm, 50 ppm, and 100 ppm. γA5, F5/γA5 and F10/γA5 nanocomposites had 17.3%, 55%, and 70% at 10 ppm, 18%, 55.16%, and 74% at 50 ppm, and 8.6%, 53.1%, and 63%, respectively. The results highlighted that F10/γA5 can be used as a remarkable adsorbent for wastewater treatment purposes.

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Simultaneous determination of dissolved organic nitrogen, nitrite, nitrate and ammonia using size exclusion chromatography coupled with nitrogen detector

Cited by 26 publications

References 32 publications

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Comparison of the analytical performance of two different electrochemical sensors based on a composite of gold nanorods with carbon nanomaterials and PEDOT:PSS for the sensitive detection of nitrite in processed meat products

Nitrate removal study of synthesized nano γ-alumina and magnetite-alumina nanocomposite adsorbents prepared by various methods and precursors

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