Determination of cadmium, cobalt, copper, lead, nickel and zinc contents in saline produced water from the petroleum industry by ICP OES after cloud point extraction

Silva, Francisco L.F.; Matos, Wladiana O.; Lopes, Gisele S.

doi:10.1039/c5ay01026h

Cited by 30 publications

(7 citation statements)

References 21 publications

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“…So, in order to keep analysis time as short as possible, the centrifugation was performed after 5 min of phase contact. The extraction is practically 48 or even change the volume of formed ABS-rich phase because of the salting-out effect, which could cause additional uncertainty and limitations for further analytical applications. The salinity effect in ABS based on THABr was investigated using NaCl in the concentration range of 0.1−10% (w/v).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Multielement Determination of Trace Heavy Metals in Water by Microwave-Induced Plasma Atomic Emission Spectrometry after Extraction in Unconventional Single-Salt Aqueous Biphasic System

et al. 2018

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For the first time liquid-liquid extraction was used for the preconcentration of heavy metals prior to their determination in water by microwave-induced plasma atomic emission spectrometry (MP-AES). Extraction of Pb(II), Cd(II), Co(II), Ni(II), Zn(II), and Cu(II) was performed in unconventional aqueous biphasic system (ABS) formed by addition of hydrophobic solid salt, namely, tetrahexylammonium bromide, to aqueous sample, with neither organic solvents nor salting-out agents being used. The metal ions were quantitatively recovered with 4-(2-pyridylazo)-resorcinol (PAR). The extract was diluted with ethanol/HCl and introduced directly into an MP-AES instrument. The factors influencing extraction (pH, reagent concentration, phase contact time, etc.) and MP-AES detection parameters were studied and optimized. For the developed method, limits of detection of 1.3, 4.9, 0.06, 1.2, 4.2, and 3.2 μg L were obtained for cadmium, cobalt, copper, nickel, lead, and zinc, respectively, providing from 60- to 500-fold improvement as compared with the analysis without preconcentration. The method was applied for the analysis of two certified reference materials (CRM) of wastewater and surface water as well as the samples of well and seawater. Coupling MP-AES with ABS extraction significantly extends the capabilities of the method, especially for the analysis of high salinity waters.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Multielement Determination of Trace Heavy Metals in Water by Microwave-Induced Plasma Atomic Emission Spectrometry after Extraction in Unconventional Single-Salt Aqueous Biphasic System

et al. 2018

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“…The small volume phase obtained after centrifugation is called surfactant-rich phase which includes micelles and analyte ions. The surfactant-rich phase containing the analyte is suitable to determine the amount of analytes with many analytical instruments such as flame atomic absorption spectrometry (FAAS) (Naeemullah et al 2016); electrothermal atomic absorption spectrometry (ETAAS, which is also known as graphite furnace atomic absorption spectrometry (GFAAS)) (López-García et al 2014;, which involves introducing a small amount of sample and then resistively heating a tube of graphite, which becomes the atomization cell; and inductively coupled plasma optical emission spectrometry (ICP-OES) (Silva et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Combination of Ultrasonic-Assisted Cloud Point Extraction with Flame AAS for Preconcentration and Determination of Trace Amounts of Silver and Cadmium in Dried Nut and Vegetable Samples

2016

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In this article, ultrasonic-assisted cloud point extraction (UA-CPE) was used to the preconcentration of trace Ag(I) and Cd(II) in dried nut and vegetable samples. After ion association of Ag(I) and Cd(II) ions with 3,7-diamino-2,8-dimethyl-5-phenyl-phenaziniumchlorid (Safranin T) in the presence of excess potassium iodide (KI) at pH 6.0, the ternary complexes formed were quantitatively extracted into a micellar phase of poly(ethyleneglycol-mono-p-nonylphenylether) (PONPE 7.5) and then determined by flame atomic absorption spectrometry (FAAS). The matrix effects of possible some interfering ions on the method recovery and tolerance limits were also investigated. Under the optimized reagent conditions, the method was linearly dependent on the analyte concentrations in the range of 0.08-90 and 3-250 μg L −1 with limits of detection of 0.02 and 0.9 μg L −1 for Ag(I) and Cd(II), respectively. The reproducibility as the percent relative standard deviations (RSDs %) (0.5, 5.0, and 25 μg L −1 for Ag(I) and 15, 30, and 100 μg L −1 for Cd(II), n = 6) was lower than 3.6 % for both analytes. The accuracy of the method was controlled by analysis of two certified samples (SRM 1573a Tomato leaves and SRM 1643e Trace elements in waters) as well as recovery studies from spiked samples. It has been observed that the results obtained are in a good agreement with the certified values at confidence interval of 95 %. The method was successfully applied to determination of Ag(I) and Cd(II) in several dried nut and vegetable samples by FAAS after separation/preconcentration with UA-CPE.

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“…14,15 In recent times, these chemometric tools have been oen employed for the optimization of analytical methods. [18][19][20][21] In this work, an extraction procedure using ultrasound assisted radiation was established for the determination of mercury in sediment samples using cold vapour atomic absorption spectrometry. A two-level full factorial design was used involving the following factors: hydrochloric acid and thiourea concentrations, sonication time and sonication temperature.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound assisted extraction for the determination of mercury in sediment samples employing cold vapour atomic absorption spectrometry

et al. 2016

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Determination of cadmium, cobalt, copper, lead, nickel and zinc contents in saline produced water from the petroleum industry by ICP OES after cloud point extraction

Abstract: Cloud point extraction for trace element analysis in samples of produced water.

Cited by 30 publications

References 21 publications

Multielement Determination of Trace Heavy Metals in Water by Microwave-Induced Plasma Atomic Emission Spectrometry after Extraction in Unconventional Single-Salt Aqueous Biphasic System

Multielement Determination of Trace Heavy Metals in Water by Microwave-Induced Plasma Atomic Emission Spectrometry after Extraction in Unconventional Single-Salt Aqueous Biphasic System

Combination of Ultrasonic-Assisted Cloud Point Extraction with Flame AAS for Preconcentration and Determination of Trace Amounts of Silver and Cadmium in Dried Nut and Vegetable Samples

Ultrasound assisted extraction for the determination of mercury in sediment samples employing cold vapour atomic absorption spectrometry

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