Preconcentration and separation of copper, zinc and cadmium by the use of 6-mercapto purinylazo resin and their application in microwave digested certified biological samples followed by AAS determination of the metal ions

Abstract A sensitive spectrophotometric method was developed for determination of paraquat, a widely used herbicide. Paraquat was reduced with glucose in an alkaline medium, and the blue radical ion obtained was measured at 600 nm. Beer’s law was obeyed at 0.1–1.2 ppm paraquat. The molar absorptivity was 1.26 × 105 L mol-1 cm-1. The standard deviation and relative standard deviation were ± 0.007 and 2.0%, respectively, for 5 μg paraquat/10 mL analyzed over 7 days. The method was free from interference by other commonly used pesticides and metal ions. The method may be used to the determine paraquat in plants, fruits, grains, water, blood, and urine.

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Fabrication of novel polymer-modified graphene-based electrochemical sensor for the determination of mercury and lead ions in water and biological samples

Journal of Analytical Science & Technology ◽

10.1186/s40543-019-0194-0 ◽

2020 ◽

Vol 11 (1) ◽

Cited By ~ 3

Author(s):

Chenthattil Raril ◽

Jamballi G. Manjunatha

Keyword(s):

Heavy Metal ◽

Detection Limit ◽

Metal Ions ◽

Biological Samples ◽

Heavy Metal Ions ◽

Electrochemical Techniques ◽

Differential Pulse ◽

Modified Graphene ◽

Water And Biological Samples

Abstract Background This paper presents the application of polyglycine-modified graphene paste electrode (PGMGPE) for the electrochemical detection of Hg (II) and Pb (II) ions in the water and biological samples. Method The developed electrode was characterized by field emission scanning electron microscopy. Electrochemical techniques such as cyclic voltammetry and differential pulse voltammetry were used to study the behavior of metal ions. Results The modification process improves the electrochemical behavior of heavy metal ions. The peak current varied linearly with the increase of the concentration leading to a detection limit of 6.6 μM (Hg (II)) and 0.8 μM (Pb (II)), respectively. Conclusion The developed electrode exhibits good sensitivity, selectivity, stability, and lower detection limit, and was successfully applied to the determination of heavy metal ions in water and biological samples with a good recovery range.

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New Polymerizable Tetraaza Macrocycle Containing Two Acridine Units for Selective Fluorescence Sensing of Metal Ions

Journal of Fluorescence ◽

10.1007/s10895-021-02851-9 ◽

2021 ◽

Author(s):

Ádám Golcs ◽

Korinna Kovács ◽

Panna Vezse ◽

Péter Huszthy ◽

Tünde Tóth

Keyword(s):

Metal Ions ◽

Biological Samples ◽

Metal Ion ◽

Tetraaza Macrocycle ◽

Fluorescence Sensing ◽

Ion Recognition ◽

Thermodynamic Constants ◽

Recognition Ability ◽

Immobilized Ionophores

AbstractA new fluorescent bis(acridino)-macrocycle containing two allyl groups was synthesized and photophysically studied. Studies were carried out on metal ion recognition and selectivity-influencing effects including the determination of the relevant thermodynamic constants as logK and pKa. The proposed sensor molecule is recommended for the development of Zn2+-selective optochemical analyzers based on covalently immobilized ionophores as it has a unique pH-independent metal ion recognition ability, which is not influenced by anions and other potentially occurring metal ions in biological samples.

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