Part 1. Spectrophotometric determination of trace mercury (II) in dental-unit wastewater and fertilizer samples using the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one and the dual-wavelength β-correction spectrophotometry

Hamza, A.; Bashammakh, Abdulaziz S.; Al-Sibaai, Abdulaziz Ibrahim; Al-Saidi, Hamed M.; El-Shahawi, M.S.

doi:10.1016/j.jhazmat.2010.01.075

Cited by 45 publications

(11 citation statements)

References 33 publications

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“…The absorbance of the complex was constant at [AMT] = 6.5 × 10 −5 to 2.2 × 10 −4 mol L −1 , but increased at concentrations above 2.2 × 10 −4 mol L −1 . A small decrease in absorbance was seen above 2.8 × 10 −4 mol L −1 , possibly because excess chromogenic reagent reduced the extent of complex formation by increasing the acidity of the solution [35]. Thus, the AMT concentration was fixed at 2.8 × 10 −4 mol L−1 for all measurements.…”

Section: Optimization Of the Recommended Proceduresmentioning

confidence: 99%

Spectrophotometric Determination of Trace Concentrations of Copper in Waters Using the Chromogenic Reagent 4-Amino-3-Mercapto-6-[2-(2-Thienyl)Vinyl]-1,2,4-Triazin-5(4H)-One: Synthesis, Characterization, and Analytical Applications

Alharthi

Al-Saidi

2020

Applied Sciences

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A simple, selective, and inexpensive spectrophotometric method is described in the present study for estimation of trace concentrations of Cu2+ in water based on its reaction with chromogenic reagent namely 4-amino-3-mercapto-6-[2-(2-thienyl)vinyl]-1,2,4-triazin-5(4H)-one (AMT). The reaction between copper(II) ions and AMT reagent gives [Cu(L)(NO3)(H2O)2]•H2O complex, where L represents AMT molecule with NH group. The formed complex exhibits a sharp, and well-defined peak at λmax = 434 nm with a molar absorptivity (ε) of 1.90 × 104 L mol−1 cm−1, and Sandell’s factor of 0.003 μg mL−2. Absorbance of the [Cu(L)(NO3)(H2O)2]•H2O follows Beer’s law over a 0.7–25 μg mL−1 range with a detection limit of 0.011 μg mL−1. Validation of the submitted method was established by estimating Cu2+ in certified reference materials and actual sea and tap water samples. The results are compared with data obtained from copper concentration measurements using ICP-OES. The chemical structure of the Cu(II)-AMT complex was fully characterized by FT-IR, SEM, EDX, TGA, and ESR techniques.

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Section: Optimization Of the Recommended Proceduresmentioning

confidence: 99%

Spectrophotometric Determination of Trace Concentrations of Copper in Waters Using the Chromogenic Reagent 4-Amino-3-Mercapto-6-[2-(2-Thienyl)Vinyl]-1,2,4-Triazin-5(4H)-One: Synthesis, Characterization, and Analytical Applications

Alharthi

Al-Saidi

2020

Applied Sciences

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“…Metode penentuan merkuri secara spektrofotometri UV-Vis telah banyak dikembangkan dengan menggunakan reagen pengompleks seperti dithizon (Grenberg et al, 1992), 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H); 2mercapto-benzothiazole (MBT) (Hamza et al, 2010), diacetyl monoxime isonicotinoyl hydrazone (DMIH) (Reddy, 2011), iodide-rhodamine (Loo et al, 2012). anthrone phenyl hydrazone (APH) (Veerana et al, 2011).…”

Section: Pendahuluanmentioning

confidence: 99%

Metode Spektrofotometri Secara Tidak Langsung untuk Penentuan Merkuri(II) berdasarkan Pembentukan Kompleks Biru Iodium-Amilum

et al. 2019

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Metode spektrofotometri secara tidak langsung telah dikembangkan untuk analisis merkuri(II) berdasarkan perbedaan absorbansi kompleks biru amilum-iodium antara larutan sampel yang mengandung ion merkuri(II) dan larutan blanko yang tidak mengandung ion merkuri(II) dalam sistem pereaksi yang berisi iodida, iodat dan amilum. Pada larutan blanko, semua ion iodida (I-) dalam sistem pereaksi dioksidasi oleh iodat menjadi iodium yang dengan adanya amilum membentuk kompleks biru iodium-amilum dan terdeteksi secara spektrofotometri pada 618 nm. Namun, bila sampel mengandung ion merkuri(II), maka sebagian ion iodida akan terikat oleh ion merkuri(II) dan membentuk kompleks tetraiodomerkurat(II), sehingga hanya sisa iodida yang dioksidasi oleh ion iodat menjadi iodium dan membentuk warna biru dengan absorbansi yang lebih rendah dibandingkan absorbansi larutan blanko. Hasil penelitian menunjukkan bahwa perbedaan absorbansi sebanding dengan konsentrasi iodida yang terikat pada ion merkuri(II) sehingga sebanding pula dengan konsentrasi merkuri(II) dalam sampel. Metode yang dikembangkan dioptimasi terhadap beberapa parameter kimia, antara lain konsentrasi larutan iodida, iodat, amilum, dan pH larutan dan pada kondisi optimum memberikan kisaran linier 1 – 9 mg L-1 ion merkuri(II) dengan R2 0,9983, dengan LOD 0,44 mgL-1. Metode ini cukup selektif terhadap ion kobalt(II) dan timbal(II), namun ion tembaga(II) dan perak(I) mengganggu pengukuran. Metode ini telah divalidasi menggunakan metode adisi standar yang diaplikasikan ke dalam sampel limbah pertambangan emas dari Lombok dengan hasil yang memuaskan.Indirect Spectrophotometry for Mercury(II) Determination Based on The Formation of Blue Starch-Iodine Complex. Indirect spectrophotometric method for determining mercury(II) concentration has been successfully developed based on the difference of the absorbance of the blue starch-iodine complex in the absence and in the presence of mercury(II). In the absence of mercury(II), all iodide ions (I-) in the reagent system are oxidized by iodate to iodine, which in the presence of starch formed a clear blue complex of starch-iodine detected spectrophotometrically at 618 nm. However, if mercury presents in the sample, some of the iodide ions are bound to mercury(II) ion forming tetraiodomercurate(II) complex, and thus, only the remaining of iodide is oxidized by iodate to iodine resulting in lower absorbance of the blue color. The results showed that the delta absorbance was proportional to the concentration of iodide bound to mercury and thus proportional to mercury(II) concentration. To achieve the sensitivity, the method was optimized to the main chemical parameters, such as the concentration of iodide, iodine, iodate, starch, and pH solution. Selectivity of the method was also studied by investigating the effect of interfering ions of copper(II), cobalt (II), lead(II), and silver (I). Under these optimum conditions, the method showed linearity measurements from 1 – 9 mg L-1 mercury(II) with correlation (R2) of 0.996. The method was also successfully applied to determine mercury(II) from small-scale gold mining tailing waste from West Lombok, Indonesia and is prospective for analysis of mercury(II) in mining waste.

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“…Thus, it is very necessary to monitor the mercury levels in our environment. The common methods for the purpose that are being adopted are complexometry and spectrophotometry [3], Cold Vapor Atomic Absorption Spectrometry (CV-AAS) [4] inductively coupled plasma Atomic emission spectrophotometry (ICP-AES) [5] and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) [6,7], X-Ray fluorescence [8] and Voltammetry [9]. But the potentiometric technique has advantages such as high selectivity, sensitivity, good precision, simplicity and low cost.…”

Section: Introductionmentioning

confidence: 99%

Chemical Sensor for Determination of Mercury in Contaminated Water

Hassan¹

2013

Mod Chem Appl

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In this research, we constructed chemical sensor for determining mercury in contaminated water because we needed fast, simple, low-cost, and accurate determination of mercury in different environmental systems. The constructed membrane composed of (Poly Vinyl Chloride) PVC as a matrix material, 1,5-diphenylthiocarbazone (dithizone) as electro active compound, and di-n-butyl phthalate (DBPH) as a plasticizer. The optimum membrane composition 30% PVC, 65% DBPH, 5% dithizone exhibited the better Nernstian response. The results showed that probe is high stability along the pH range from (3.5 to 8). The electrode displays a linear log [Hg 2+ ] versus Electromotive Force (EMF) response over a wide concentration range of (5×10 −6 to 1×10 −2 M) with Nernstian slope of 29.7 ± 0.5 mV decade -1 and limit of detection 3×10 −6 M. The proposed sensor shows relatively high selectivity for mercury ion in different matrix solution, other ions had negligible interference effect on the reading.

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Part 1. Spectrophotometric determination of trace mercury (II) in dental-unit wastewater and fertilizer samples using the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one and the dual-wavelength β-correction spectrophotometry

Cited by 45 publications

References 33 publications

Spectrophotometric Determination of Trace Concentrations of Copper in Waters Using the Chromogenic Reagent 4-Amino-3-Mercapto-6-[2-(2-Thienyl)Vinyl]-1,2,4-Triazin-5(4H)-One: Synthesis, Characterization, and Analytical Applications

Spectrophotometric Determination of Trace Concentrations of Copper in Waters Using the Chromogenic Reagent 4-Amino-3-Mercapto-6-[2-(2-Thienyl)Vinyl]-1,2,4-Triazin-5(4H)-One: Synthesis, Characterization, and Analytical Applications

Metode Spektrofotometri Secara Tidak Langsung untuk Penentuan Merkuri(II) berdasarkan Pembentukan Kompleks Biru Iodium-Amilum

Chemical Sensor for Determination of Mercury in Contaminated Water

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