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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

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    Green flow injection spectrophotometric system for lead ion (II) evaluation in vegetables samples using new azo reagent

    Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
    2023, v.36 no.1, pp.1-11
    https://doi.org/10.5806/AST.2023.36.1.1
    Fatimah Lateef Al-Zubaidi (Chemistry Department, Education for Girls Faculty, Kufa University/ Najaf Technical Institute, Al-Furat Al-Awsat Technical University)
    Khdeeja Jabbar Ali (Chemistry Department, Education for Girls Faculty, Kufa University)
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    Abstract

    A new, sensitive, and reliable flow injection methodology was investigated for the determination of lead ion (II) in vegetables’ samples using a laboratory-prepared reagent 2-[(6-methoxy-2-benzothiazoly)azo]- 4-methoxy phenol (6-MBTAMP). Infrared spectroscopy, UV-visible spectrophotometry, Energy dispersive Xray spectroscopy (EDX), Elemental Analysis (CHN), nuclear magnetic resonance spectroscopy 1HNMR, and 13CNMR techniques were used to characterize the reagent and lead (II) complex. The method is based on lead ion (II) reacting with the reagent (6-MBTAMP) in a neutral solution to produce a green-red complex with a maximum absorbance at 670 nm. The optimum conditions, such as flow rate, lead ion (II) volume, reagent volume, medium pH, reagent concentration, and reaction coil length were thoroughly examined. The limits of detection (LOD) and quantification (LOQ) were determined to be 0.621 mg·L−1 and 2.069 mg·L−1, respectively, while Sandell's sensitivity was determined to be 0.345 μg·cm−2.

    keywords
    flow injection, metal ions, vegetables' samples, 6-MBTAMP, toxic ions


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