scholarly journals Applications of Metal Complexes Dyes in Analytical Chemistry

2021 ◽  
Author(s):  
Mariame Coulibaly
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Electrode Materials ◽  
Electrochemical Sensors ◽  
Ecological Quality ◽  
Element Determination ◽  
Sources Of Pollution ◽  
Ultra Trace ◽  
Aromatic Heterocyclic

Trace elements, especially heavy metals, are considered to be one of the main sources of pollution in the environment since they have a significant effect on ecological quality. Commonly, the analytical methods for the determination of trace metals are the spectrometry techniques. While, the electroanalytical methods are recognized as a powerful technique for trace metals owing to its remarkable sensitivity, relatively inexpensive instrumentation, ability for multi-element determination at trace and ultra trace level. New alternative electrode materials are highly desired to develop sensitive stripping sensors for meeting the growing demands for on-site environmental monitoring. Dyes aromatic heterocyclic compound, used in food, textile and cosmetic industries has been used for spectrophotometric determination of metals. In electrochemitry, methods for metals determination based on their complexation with dyes were proposed. In this chapter, a brief summary of spectrometry methods and electrochemical sensors for heavy metals detection based on the formation of metals dyes complexes is presented.

scholarly journals MnO2@Reduced Graphene Oxide Nanocomposite-Based Electrochemical Sensor for the Simultaneous Determination of Trace Cd(II), Zn(II) and Cu(II) in Water Samples

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 517
Author(s):  
Siyamthanda Hope Mnyipika ◽  
Tshimangadzo Saddam Munonde ◽  
Philiswa Nosizo Nomngongo
Keyword(s):  
Heavy Metals ◽  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Rapid Detection ◽  
Electrochemical Sensors ◽  
Simultaneous Detection ◽  
Cyclic Voltammograms ◽  
Current Response ◽  
Mno2 Nanoparticles

The rapid detection of trace metals is one of the most important aspect in achieving environmental monitoring and protection. Electrochemical sensors remain a key solution for rapid detection of heavy metals in environmental water matrices. This paper reports the fabrication of an electrochemical sensor obtained by the simultaneous electrodeposition of MnO2 nanoparticles and RGO nanosheets on the surface of a glassy carbon electrode. The successful electrodeposition was confirmed by the enhanced current response on the cyclic voltammograms. The XRD, HR-SEM/EDX, TEM, FTIR, and BET characterization confirmed the successful synthesis of MnO2 nanoparticles, RGO nanosheets, and MnO2@RGO nanocomposite. The electrochemical studies results revealed that MnO2@RGO@GCE nanocomposite considerably improved the current response on the detection of Zn(II), Cd(II) and Cu(II) ions in surface water. These remarkable improvements were due to the interaction between MnO2 nanomaterials and RGO nanosheets. Moreover, the modified sensor electrode portrayed high sensitivity, reproducibility, and stability on the simultaneous determination of Zn(II), Cd(II), and Cu(II) ions. The detection limits of (S/N = 3) ranged from 0.002–0.015 μg L−1 for the simultaneous detection of Zn(II), Cd(II), and Cu(II) ions. The results show that MnO2@RGO nanocomposite can be successfully used for the early detection of heavy metals with higher sensitivity in water sample analysis.

Determination of Contaminated Heavy Metals in Lacquer Thinner

2018 ◽  
Vol 879 ◽  
pp. 144-148
Author(s):  
Woravith Chansuvarn ◽  
Kunawoot Jainae
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Absorption Spectrometry ◽  
High Concentration ◽  
X Ray ◽  
Wet Digestion ◽  
Clear Solution ◽  
Cu And Zn

The aim of this work needed to discover the problem of lacquer thinner products claimed with dissatisfying the quality of coating and color appearance. The trace metals produced cans was focused on release to solvents. The contaminated trace metals including Fe, Sn, Cu, and Zn in lacquer thinner were also determined by atomic absorption spectrometry (AAS). The lacquer thinner samples were simply carbonized to be ashes by furnace muffle at 550°C for 8 hours. The carbonized ashes were then also digested by conventional wet digestion with concentrated nitric acid until a clear solution was archived. Twenty samples of lacquer thinner were achieved from the paint manufacturer. The content of Fe, Sn, Cu, and Zn was found in the range of 0.0631-77.190 mg/kg, ND-12.613 mg/kg, ND-1.4679 mg/kg, and ND-0.4028 mg/kg, respectively. The result of high concentration of Fe related to the appearance of lacquer thinner color. The evidence of released heavy metals in the ashes of lacquer thinner samples was evaluated by X-ray fluorescence technique. The result of this work was concluded that the contaminated trace metals in the suspected lacquer thinner samples were leached from the metallic package.

Novel thiol-functionalized covalent organic frameworks enabled ICP-MS measurement of ultra-trace metals in complex metrics

2022 ◽  
Author(s):  
Yong Tian ◽  
Jiawen Cheng ◽  
Xiaoxuan Han ◽  
Yutong Li ◽  
Ting Yang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Environmental Science ◽  
Covalent Organic Frameworks ◽  
Trace Level ◽  
Covalent Organic Framework ◽  
Icp Ms ◽  
Ultra Trace ◽  
Organic Framework

The measurement of ultra-trace level of heavy metals in complex metrics is of great concern and challenge in life and environmental science. Herein, a novel thiol-functionalized covalent organic framework (COF)...

Carbon Paste Electrode as a Support for Mercury Film in Potentiometric Stripping Determination of Heavy Metals

2000 ◽  
Vol 65 (6) ◽  
pp. 1047-1054 ◽  
Author(s):  
Jiří Konvalina ◽  
Elmorsy Khaled ◽  
Karel Vytřas
Keyword(s):  
Heavy Metals ◽  
Electrode Materials ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Carbon Paste ◽  
Mercury Film ◽  
Potentiometric Stripping Analysis ◽  
Reference Determination ◽  
Paste Electrode

Carbon paste electrodes containing silicone or paraffin oil as the pasting liquids, preplated with a mercury film, were tested for possible use in potentiometric stripping determination of heavy metals like lead, cadmium and copper. The detailed study has shown that the results are comparable with those obtained with widely used mercury-coated glassy carbon electrode with regard to the linear response at low ppb levels, detection limits, reproducibility, etc. The potentiometric stripping analysis with both electrode materials was used for the determination of lead and copper in a soot sample. No significant differences were found when these results were compared with a reference determination performed by graphite-furnace atomic absorption spectrometry.

scholarly journals Development of Electrochemical Sensors/Biosensors to Detect Natural and Synthetic Compounds Related to Agroalimentary, Environmental and Health Systems in Argentina. A Review of the Last Decade

Chemosensors ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 294
Author(s):  
Adrian M. Granero ◽  
Héctor Fernández ◽  
María A. Zon ◽  
Sesbastián N. Robledo ◽  
Gastón D. Pierini ◽  
...  
Keyword(s):  
Health Systems ◽  
Electrode Materials ◽  
Electrochemical Sensors ◽  
Research Groups ◽  
Synthetic Antioxidants ◽  
Synthetic Compounds ◽  
Analytical Tools ◽  
Chemometric Tools ◽  
Natural And Synthetic

Electrochemical sensors and biosensors are analytical tools, which are in continuous development with the aim of generating new analytical devices which are more reliable, cheaper, faster, sensitive, selective, and robust than others. In matrices related to agroalimentary, environmental, or health systems, natural or synthetic compounds occur which fulfil specific roles; some of them (such as mycotoxins or herbicides) may possess harmful properties, and others (such as antioxidants) beneficial ones. This imposes a challenge to develop new tools and analytical methodologies for their detection and quantification. This review summarises different aspects related to the development of electrochemical sensors and biosensors carried out in Argentina in the last ten years for application in agroalimentary, environmental, and health fields. The discussion focuses on the construction and development of electroanalytical methodologies for the determination of mycotoxins, herbicides, and natural and synthetic antioxidants. Studies based on the use of different electrode materials modified with micro/nanostructures, functional groups, and biomolecules, complemented by the use of chemometric tools, are explored. Results of the latest reports from research groups in Argentina are presented. The main goals are highlighted.

scholarly journals Determination of Heavy Metals in Sawdust Particles, Distribution in Soil and Accumulation in Plants at Ahiaeke Timber Market in Umuahia, Nigeria

2018 ◽  
Vol 2 (2) ◽  
pp. 160-170 ◽  
Author(s):  
P. C. Ogbonna ◽  
E. N. Kalu ◽  
O. U, Nwankwo
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Health Risks ◽  
Metal Toxicity ◽  
Main Route ◽  
Major Threat ◽  
Sources Of Pollution ◽  
The People ◽  
Timber Market

Farmers are constrained to farming on lands adjoined to sources of pollution without considering the health implications of consuming crops grown on such lands. The main route of entry of heavy metals in human body is via ingestion of food contaminated with heavy metals. Heavy metal toxicity has proven to be a major threat and there are several health risks associated with it. This, therefore, necessitated the determination of heavy metals in sawdust, distribution in soil and accumulation in plants at Ahiaeke timber market in Umuahia, Abia State. The study assessed metals (chromium [Cr], zinc [Zn], cadmium [Cd], and copper [Cu]) in sawdust particles, their distribution in soil and accumulation in plants. The highest concentration of Zn (51.00±1.84 mg/kg) and Cr (0.170±0.014 mg/kg) was observed at the sawdust dump 2, Cu (8.24±0.60 mg/kg) was highest at sawdust dump 1 while Cd (4.72±0.071 mg/kg) was highest at sawdust dump 3. The values of the highest concentration of Zn (119.7±7.02 mg/kg), Cu (75.85±4.80 mg/kg) and Cd (22.39±3.30 mg/kg) in soil were observed in 0-10 cm depth at the distance of 20 m. The values of Zn (119.7±7.02 mg/kg) and Cd (22.39±3.30 mg/kg) in soil is above the maximum permitted levels of 60 mg/kg (Zn) and 0.1 mg/kg (Cd) established by the Codex Alimentarius Commission. The highest concentration of Zn (34.70±7.05 mg/kg), Cu (5.34±0.11 mg/kg) and Cd (2.94±0.515) in plants was assimilated by Centrosema pubescence. The level of Cd in plants is well above the permissible limit (PL) 0.3 mg/kg set by FAO/WHO for vegetables and herbs. Consumption of such contaminated C. pubescence can be a route of entry of Cd in grazing animals’ vis-à-vis the people who depend on such herbivores for protein.

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