Determination of inorganic mercury in petroleum production water by inductively coupled plasma optical emission spectrometry following photochemical vapor generation

Francisco, Barbara Bruna A.; Rocha, Anderson A.; Grinberg, Patrícia; Sturgeon, Ralph E.; Cassella, Ricardo J.

doi:10.1039/c5ja00444f

Cited by 27 publications

(7 citation statements)

References 41 publications

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“…The best DL value was best achieved when using 20% (v/v) formic acid. A possible reason is that the kinetics of PVG efficiency of Hg(II) is noticeably different between these two acids: the transformation from Hg(II) to Hg(0) needs a longer irradiation time in the acetic acid media . Thus, 20% (v/v) formic acid was selected for all subsequent studies.…”

Section: Resultsmentioning

confidence: 99%

“…Mercury vapor had been generated in formic acid, acetic acid, and propionic acid media, but propionic acid has an unpleasant odor and typically causes frothing in the GLS. 33 Therefore, 0.5 mg L −1 Hg(II) solutions containing various concentrations of formic acid or acetic acid were investigated with 30 s irradiation time. The pumping rate of pump B was 85 mL min −1 and Ar flow rate was 80 mL min −1 .…”

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confidence: 99%

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Flow Injection Photochemical Vapor Generation Coupled with Miniaturized Solution-Cathode Glow Discharge Atomic Emission Spectrometry for Determination and Speciation Analysis of Mercury

Guo

et al. 2017

Anal. Chem.

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A novel, compact, and green method was developed for the determination and speciation analysis of mercury, based on flow injection photochemical vapor generation (PVG) coupled with miniaturized solution cathode glow discharge-atomic emission spectroscopy (SCGD-AES). The SCGD was generated between a miniature hollow titanium tube and a solution emerging from a glass capillary. Cold mercury vapor (Hg(0)) was generated by PVG and subsequently delivered to the SCGD for excitation, and finally the emission signals were recorded by a miniaturized spectrograph. The detection limits (DLs) of Hg(II) and methylmercury (MeHg) were both determined to be 0.2 μg L. Moreover, mercury speciation analysis could also be performed by using different wavelengths and powers from the UV lamp and irradiation times. Both Hg(II) and MeHg can be converted to Hg(0) for the determination of total mercury (T-Hg) with 8 W/254 nm UV lamp and 60 s irradiation time; while only Hg(II) can be reduced to Hg(0) and determined selectively with 4 W/365 nm UV lamp and 20 s irradiation time. Then, the concentration of MeHg can be calculated by subtracting the Hg(II) from the T-Hg. Because of its similar sensitivity and DL at 8 W/254 nm, the simpler and less toxic Hg(II) was used successfully as a primary standard for the quantification of T-Hg. The novel PVG-SCGD-AES system provides not only a 365-fold improvement in the DL for Hg(II) but also a nonchromatographic method for the speciation analysis of mercury. After validating its accuracy, this method was successfully used for mercury speciation analysis of water and biological samples.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Flow Injection Photochemical Vapor Generation Coupled with Miniaturized Solution-Cathode Glow Discharge Atomic Emission Spectrometry for Determination and Speciation Analysis of Mercury

Guo

et al. 2017

Anal. Chem.

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“…Moreover, the presence of H + , Cl À , and NO 3 À ions cause the suppression of PVG of Hg. 11,30,31 Mercury vapor has been photogenerated from several samples such as biological tissue, 15,32 cosmetics, 18 glycerin, 16 ethanol biofuel, 23 petroleum production water, 22 solubilized or diluted in formic acid and also from biological samples treated with TMAH. 15 In this work two approaches were investigated as sample preparation, using CRM.…”

Section: Sample Preparationmentioning

confidence: 99%

Determination of mercury in fish by photochemical vapor generation graphite furnace atomic absorption spectrometry

et al. 2016

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“…The best-known and conventionally applied sample introduction system, based on pneumatic nebulization (PN), provides a quite low transport efficiency of analytes into a plasma source (typically up to 5%) [1]. Therefore, it is not surprising that alternative sample introduction techniques are being developed, e.g., ultrasonic nebulization (USN) [2][3][4][5], hydride generation (HG) [5][6][7][8], and photochemical vapor generation (PVG) [8][9][10]. Relatively new approaches, based on electric discharge phenomena, are also increasingly appreciated, including dielectric barrier discharge (DBD) [11], electrolyte-as-cathode glow discharge (ELCAD) [12], and other ELCAD-derived microplasmas, e.g., solution cathode glow discharge (SCGD) [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Hanging drop cathode-atmospheric pressure glow discharge as a new method of sample introduction for inductively coupled plasma-optical emission spectrometry

et al. 2020

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This work reports the use of hanging drop cathode-atmospheric pressure glow discharge (HDC-APGD) as a new method of sample introduction for inductively coupled plasma-optical emission spectrometry (ICP-OES). The developed arrangement was characterized by a low sample uptake (0.56 mL min−1) and the fact that the entire sample solution volume was consumed by the discharge. This resulted in a very high transport efficiency of analytes from the sample solution into the ICP torch (usually > 80%). Under the optimal operating conditions of HDC-APGD, intensities of emission lines of studied elements were, on average, 2 times higher as compared to those obtained with conventional pneumatic nebulization (PN). Moreover, in the case of I and Y, the observed signal enhancements were even higher, i.e., 6.2 and 6.1 times, respectively. It was also shown that in the case of B and some elements that are known to form different volatile species (Ag, Bi, Cd, Hg, Os, Pb, and Se), the presence of low molecular weight organic compounds in the sample solution, i.e., CH3OH, C2H5OH, HCOOH, CH3COOH, or HCHO, resulted in the additional enhancement of their signals. It was especially evident in the case of Hg for which a 8.6-fold signal enhancement in the presence of HCOOH was noticed. The system presented herein was distinguished from other competitive APGD-type discharges because it could be successfully used for the determination of a vast group of elements, including alkali metals, alkaline earth metals, transition metals, and non-metals.

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Determination of inorganic mercury in petroleum production water by inductively coupled plasma optical emission spectrometry following photochemical vapor generation

Cited by 27 publications

References 41 publications

Flow Injection Photochemical Vapor Generation Coupled with Miniaturized Solution-Cathode Glow Discharge Atomic Emission Spectrometry for Determination and Speciation Analysis of Mercury

Flow Injection Photochemical Vapor Generation Coupled with Miniaturized Solution-Cathode Glow Discharge Atomic Emission Spectrometry for Determination and Speciation Analysis of Mercury

Determination of mercury in fish by photochemical vapor generation graphite furnace atomic absorption spectrometry

Hanging drop cathode-atmospheric pressure glow discharge as a new method of sample introduction for inductively coupled plasma-optical emission spectrometry

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