Photo- and thermo-chemical vapor generation of mercury

Sturgeon, Ralph E.; Luong, Van T.

doi:10.1039/c3ja50152c

Cited by 28 publications

(29 citation statements)

References 28 publications

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“…4A-C. Due to the U-shaped geometry of the pen lamp, the ber optic probe sampled emission from the central portion of the discharge (the intensity varies with rotation of the lamp). 42 Fortunately, the ow-through lamp provides for a much more intense and efficient irradiation of samples such that despite signicant loss of intensity due to this cooling effect, it remains favorable for PVG of a number of elements. Aer stabilization of each lamp (approx.…”

Section: Inuence Of Uv Lamp Characteristicsmentioning

confidence: 99%

System optimization for determination of cobalt in biological samples by ICP-OES using photochemical vapor generation

Jesus

Grinberg

Sturgeon

2016

J. Anal. At. Spectrom.

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An optimized photochemical vapor generation (PVG) approach for efficient synthesis of volatile cobalt species is described. Solutions containing Co(II) in a pH 3.3 medium of 50% formic acid were exposed to a source of deep UV (254 and 185 nm) radiation generated within a 19 W flow-through low pressure mercury discharge lamp. Following efficient phase separation, the analyte was transported to an ICP-OES system for detection at the 238.892 nm emission line of Co I. Several variables were investigated, including the type of UV lamp and gas-liquid separator, identity and concentration of the low molecular weight organic acid, solution pH, sample flow rate and exposure time to the UV irradiation as well as transport gas flow and mode of introduction of sample (continuous or segmented) to the ICP. In continuous mode, an optimum generation efficiency of 42 AE 2% was achieved with an irradiation time of 10 s, providing a 27-fold improvement in sensitivity compared to pneumatic nebulization and a limit of detection of 0.4 mg L À1 with a precision of 3% at 100 mg L À1 . Direct analysis of acid digested biological tissues (NRC TORT-2 and TORT-3) was hampered by strong matrix interferences from the presence of nitrate and other ions which could be circumvented by longer irradiation time and sufficient dilution such that accurate analysis of real samples by the method of additions could be achieved while maintaining high generation efficiency.

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Section: Inuence Of Uv Lamp Characteristicsmentioning

confidence: 99%

System optimization for determination of cobalt in biological samples by ICP-OES using photochemical vapor generation

Jesus

Grinberg

Sturgeon

2016

J. Anal. At. Spectrom.

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“…Todos os cálculos empregados estão baseados nas orientações do guia de validação do INMETRO. 19 Duas curvas analíticas foram construídas de modo a avaliar qual apresentaria a melhor sensibilidade. A primeira curva foi obtida com padrões de Hg 2+ em meio de 20% (v/v) de HCOOH e 76% (v/v) de CH 3 CH 2 OH (meio alcoólico) e a segunda curva foi obtida nas mesmas condições, mas na presença da matriz (biodiesel).…”

Section: Parâmetros De Méritounclassified

“…Os limites de detecção (LD) e quantificação (LQ) foram calculados de acordo com as equações 1 e 2, respectivamente: 19 LD= 3(S/a)…”

Section: Parâmetros De Méritounclassified

“…Foram consideradas como satisfatórias as curvas com valores de R maiores ou iguais a 0,99. A precisão foi avaliada através da estimativa do desvio padrão relativo das leituras (DPR) e calculada pela Equação 3: 19 DPR (%) = (S/X) x 100 (3) onde S é igual a estimativa de desvio-padrão das medidas, X é igual a concentração média. Foram usados como valores de referência aceitáveis, os descritos pela AOAC.…”

Section: Parâmetros De Méritounclassified

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Evaluation of Mercury Concentration in Biodiesel Samples by Photochemical Vapor Generation

Lisboa¹,

Ribeiro²,

Vieira³

2018

Rev. Virtual Quim.

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In this paper, the photochemical vapor generation coupled with atomic absorption spectrometry was used to assess the concentration of Hg in biodiesel samples. The main parameters to assess the best conditions for the photochemical vapor generation of Hg were investigated (sample mass, formic acid concentration, irradiation time and gas flow rate). Volatile species of Hg were generated in biodiesel samples prepared in 20% (v/v) formic acid and 76% (v/v) ethanol. Analytical curves were generated using inorganic (Hg 2+) and organic standards (CH 3 Hg + e C 2 H 5 Hg +) in ethanol and showed correlation coefficients higher than 0.99. The limits of detection and quantification, in µg L-1 , were 0.01 and 0.05, respectively. Due to the lack of biodiesel samples with a certified concentration of Hg, the accuracy was evaluated by assessing the recoveries of species of Hg added to the samples, obtaining values ranged from 101.0 to 111.9% of recoveries. The relative standard deviation values were lower than 0.1%, indicating an excellent precision of the method. No Hg was detected in the biodiesel samples, considering the obtained limit of detection. The proposed method is sensitive and the sample pre-treatment is simple and practical.

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“…The desorption temperature profiles of inorganic Hg compounds -Hg 0 , HgCl 2 , HgO, HgSO 4 , humic-bound Hg and HgS -were used 238 to study interactions between Hg species and soil. Organic-Hg was determined 239 by TD-AAS following digestion of 0.5 g soil samples in 5 mL of 0.3M CuBr 2 solution in 5% v/v HCl and selective extraction into 10 mL DCM.A deep-UV LED photoreactor was evaluated by Sturgeon and Luong240 for the reduction of inorganic and MeHg prior to their determination by PVG-AAS. The device contained a set of 0.3 mW UV LEDs (245-260 nm peak output) and the reaction was carried out in 2% formic acid.…”

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confidence: 99%

2014 atomic spectrometry update – a review of advances in environmental analysis

Butler

Cairns

Cook

et al. 2015

J. Anal. At. Spectrom.

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This is the 29th annual review of the application of atomic spectrometry to the chemical analysis of environmental samples. This Update refers to papers published approximately between September 2012 and July 2013 and continues the series ofAtomic Spectrometry Updates (ASUs) Developments in geochemical analysis included the production and (re)certification of new geological RMs for bulk, isotopic and microspatial analysis. Optimisation of LA-ICP-MS techniques for the interrogation of geochemical samples continues to be reported and a number of useful instrumental review articles (AMS, ICP-MS and SIMS) have been published.Feedback on this review is most welcome and the review coordinator can be contacted using the email address provided. Sampling techniquesThe development of personal workplace air samplers, used to monitor workers' exposure to airborne particles, continues to be a fertile area of research. cartridge assembly which could then be loaded directly into an XRF system for analysis. Initial wind tunnel tests using test aerosols of known particle size indicated that this sampler could collect representative particle size distributions.Generation of test particle atmospheres in a laboratory environment is difficult and it is most informative to see publications describing the development and validation of aerosol test chambers. A system 21 for source characterisation and controlled human exposure to NPs generated during gas-metal arc welding had an airtight 22 m 3 climate-controlled stainless steel chamber at its core. A variety of online measurements, e.g. using TEOM or SMPS, and offline measurements, e.g. using electron microscopy and PIXE techniques, could be made via sampling ports/samplers. Test particles were generated in a separate chamber and subsequently piped into the main chamber. Stable concentrations of atmospheric particles could be maintained for up to 6 h and concentrations could be varied from <5 µg m by EDXRF spectrometry (Cr, Cu, Fe, Ni, Pb and Zn), there were no significant differences in values between the two measurement approaches (paired t-test, p > 0.2, 95 % CI). In summary, the authors concluded that this method was suitable for the high throughput analysis of lightly loaded air filter samples. 11The bioaccessible metal fraction in urban aerosol particles may be a more informative metric than the total metal composition in assessng the potential health effects of exposure to inhaled particles. . Using this optimised method, the airborne levels of Ag in Buenos Aires was determined to be 2-4.5 ng m , respectively. Emission spectroscopyInvestigation into the use of LIBS for the analysis of aerosol samples is a focus of a number of research groups. Elemental emission intensities were normalised to carbon (measured at 247.856 nm) which could be used as an internal standard because the carbon emission from the underlying nylon filter was much larger and relatively more stable than the signal from the deposited carbonaceous particles. This approach was useful for minimising shot-to-...

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Photo- and thermo-chemical vapor generation of mercury

Cited by 28 publications

References 28 publications

System optimization for determination of cobalt in biological samples by ICP-OES using photochemical vapor generation

System optimization for determination of cobalt in biological samples by ICP-OES using photochemical vapor generation

Evaluation of Mercury Concentration in Biodiesel Samples by Photochemical Vapor Generation

2014 atomic spectrometry update – a review of advances in environmental analysis

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