Sequential injection system with multi-parameter analysis capability for water quality measurement

Kaewwonglom, Natcha; Jakmunee, Jaroon

doi:10.1016/j.talanta.2015.07.005

Cited by 23 publications

(12 citation statements)

References 15 publications

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“…Interestingly, two complexes having d 7 and d 8 configurations with large spin densities on N−O groups were also identified as local minima (see Supporting Information). The optimized geometry of both high-spin complexes showed significant distortion of the metalloadamantane unit, in which one M−O distance was elongated (2.37 Å for d 7 , 3.50 Å for d 8 ) compared to the other two bonds (1.91 Å for d 7 , 1.98 Å for d 8 ). According to Mulliken population analysis, the longer M−O distances are formed with nitroxide radical groups.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…These authors disclosed that oxygen was required to form these complexes in order to oxidize the metal ion. In the reaction with formaldoxime or its cyclotrimer tfoH 3 , manganese gave the most intensive coloring, which allowed the analytical determination of this metal at very low concentrations. − Since then, the formaldoxime method has become one of the most reliable techniques for colorimetric or spectrophotometric determination of manganese in the presence of other metals. − Moreover, the use of formaldehyde oxime as an effective extracting agent of d -metals from several types of ores, such as pyrolusite, malachite, heterogenite, and deep-sea manganese nodules, was suggested …”

Section: Introductionmentioning

confidence: 99%

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Revealing the Structure of Transition Metal Complexes of Formaldoxime

et al. 2021

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Aerobic reactions of iron(III), nickel(II), and manganese(II) chlorides with formaldoxime cyclotrimer (tfoH 3 ) and 1,4,7-triazacyclononane (tacn) produce indefinitely stable complexes of general formula [M(tacn)(tfo)]Cl. Although the formation of formaldoxime complexes has been known since the end of 19th century and applied in spectrophotometric determination of Dmetals (formaldoxime method), the structure of these coordination compounds remained elusive until now. According to the X-ray analysis, [M(tacn)(tfo)] + cation has a distorted adamantane-like structure with the metal ion being coordinated by three oxygen atoms of deprotonated tfoH 3 ligand. The metal has a formal +4 oxidation state, which is atypical for organic complexes of iron and nickel. Electronic structure of [M(tacn)(tfo)] + cations was studied by XPS, NMR, cyclic (CV) and differential pulse (DPV) voltammetries, Mossbauer spectroscopy, and DFT calculations. Unusual stabilization of high-valent metal ion by tfo 3− ligand was explained by the donation of electron density from the nitrogen atom to the antibonding orbital of the metal−oxygen bond via hyperconjugation as confirmed by the NBO analysis. All complexes [M(tacn)(tfo)]Cl exhibited high catalytic activity in the aerobic dehydrogenative dimerization of p-thiocresol under ambient conditions.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revealing the Structure of Transition Metal Complexes of Formaldoxime

et al. 2021

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“…The major challenge of this method is that phenol is odorous and toxic in nature. In the modified phenate method, phenol is replaced with more environment friendly compounds such as salicylate, o-phenylphenol (OPP), etc [33][34][35][36][37][38]. However, the use of salicylate has not been satisfactory due to low sensitivity [39][40][41].…”

Section: Phenate Methodsmentioning

confidence: 99%

Methods for the Detection and Remediation of Ammonia from Aquaculture Effluent: A Review

Sodeinde

Animashaun

Adubiaro

2022

J. Nig. Soc. Phys. Sci.

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Aquaculture practice is growing at an alarming rate in the world due to rising human population and improved agricultural activities. It is a very important sector that is contributing to the food security of various nations, generating employment and foreign exchange earnings for economic development. However, this practice produces large amount of ammonia based effluent thus threatening environmental sustainability. This review focused on the critical assessment of various physicochemical and biological treatments applied in the remediation of ammonia from aquaculture effluent. The physicochemical methods include mainly adsorption, photocatalytic and electrochemical degradation by different materials while the biological methods involve the use of plant biomass, animals and microorganisms. In addition, different detection methods of ammonia and environmental impact of climate change on aquaculture management system were discussed.

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“…The salicylate method in the field of rapid determination of ammonium ions is mainly reflected by its combined use with a flow analyzer. Its determination time has ranged from 1.58 to 10 min per sample, and determination objects have included river water, rainwater, seawater, tap water, well water, mountain spring water, and so on [ 6 , 7 , 8 , 9 , 10 ]. A small number of salicylate test paper methods have also been reported [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Water Ammonium Ion Test Kit and Its Feasibility for the Analysis of Protein in Food

Xia

Zhou³

et al. 2022

Molecules

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The traditional method for the determination of protein in food needs the operations of digestion, distillation, absorption, and titration; therefore, it is complicated and time-consuming and requires professional personnel. Is there a more convenient and faster detection method that can directly determine the ammonium ions in protein digestion solution to obtain the protein content of food and avoid the distillation–absorption–titration process? The feasibility of water ammonium ion test kits for food protein rapid detection was discussed here. After digestion, the protein in food transforms into ammonium ions in the digestion solution. Because of the variety of food, there are many different inorganic ions left in the food digestion solution, and at the same time, digestion agents are added in the digestion process and become potential interference factors in ammonium determination. Therefore, the detection accuracy of ammonium test kits needs to be evaluated first, including their anti-interference ability. The standard curve of ammonium was established by the test kit. When the ammonium concentration was 0.00–2.50 mg/L, the absorbance at 620 nm was linearly related to the ammonium concentration, the determination coefficient R2 was 0.9995, and the detection limit of this method was 0.01 mg/L. The influences of temperature, pH value, and reaction time on the test kit method were discussed. The precision was 0.90–3.33%; the repeatability was 1.71–4.86%; and the recovery rate of tap water, river water, and sea water was controlled within 90–103%. The anti-interference ability of the evaluated test kit was better than that of the national standard detection method. The test kit, combined with sample pretreatment and protein conversion formula, was used to detect protein in different types of food (milk powder, rice flour, wheat flour, soy, banana, milk, fish food, chicken food, and dog food). The results showed that there were no significant differences (ρ > 0.05) between the national method and the test kit method. The ammonium ion test kit method shortened the determination time and had higher sensitivity, showing its potential for the rapid determination of food protein.

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Sequential injection system with multi-parameter analysis capability for water quality measurement

Cited by 23 publications

References 15 publications

Revealing the Structure of Transition Metal Complexes of Formaldoxime

Revealing the Structure of Transition Metal Complexes of Formaldoxime

Methods for the Detection and Remediation of Ammonia from Aquaculture Effluent: A Review

Evaluation of Water Ammonium Ion Test Kit and Its Feasibility for the Analysis of Protein in Food

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