Validation and quality control of methylmercury determinations by means of capillary electrophoresis

Díaz, Antonia María Carro; Lorenzo-Ferreira, R.A.; Cela-Torrijos, Rafael

doi:10.1007/bf01244380

Cited by 29 publications

(10 citation statements)

References 19 publications

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“…The LODs attained were ,0.13 mg/L. The proposed extraction and separation method was later validated with some modifications by Carro Diaz et al [21] for determination of methyl mercury in fish samples with recoveries between 95 and 100% and day-to-day and within-day repeatability of 2.8% and 1.6%, respectively. Gaspar and Pager [22,23] have shown that mercury species can be complexed and separated with a number of different thiolic compounds, e.g., cysteine, glutathione, 2-mercaptonicotinic acid and mercaptoacetic acid.…”

Section: Complexation With Mercaptocompoundsmentioning

confidence: 99%

“…Due to the complete ionization of the -COOH functional group (typically, pK a ,3-6) in alkaline media, the resulting complex has one negative charge. Inorganic Hg 21 binds to two cysteine moieties and thus forms a dianion. An example of the separation is shown in Fig.…”

Section: Complexation With Mercaptocompoundsmentioning

confidence: 99%

“…While inorganic mercury species (Hg 2 21 , Hg 21 ) have appreciable water solubility, the aqueous solubility of organomercury compounds in water is limited and must be improved by adding organic solvents, e.g., methanol. Direct CE separation of mercury compounds without derivatization is thus non-trivial and of all publications concerned with CE speciation of mercury, only three [17][18][19] cover the direct separation of mercury species.…”

Section: Derivatization Prior To Ce Separationmentioning

confidence: 99%

See 2 more Smart Citations

Mercury speciation by CE: A review

et al. 2007

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CE methods for the speciation of inorganic and organomercury compounds are reviewed. Sample preparation, separation conditions and detection modes are discussed. Efficient separation and sensitive determination of mercury species by CE typically involves complexation with various thiols, chromogenic and other chelating agents; however, some methods do not require complexation. Spectrophotometric detection based on UV-visible absorption is by far the most commonly used. Hyphenated techniques, such as CE/inductively coupled plasma (ICP)-MS, hydride generation coupled to ICP-MS or atomic fluorescence spectrometry and CE/atomic absorption spectrometry are gaining popularity due to their high sensitivity and selectivity. Last, but not least, the potential and applications of electrochemical methods for detection of separated mercury species are outlined.

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Section: Complexation With Mercaptocompoundsmentioning

confidence: 99%

Section: Complexation With Mercaptocompoundsmentioning

confidence: 99%

Section: Derivatization Prior To Ce Separationmentioning

confidence: 99%

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Mercury speciation by CE: A review

et al. 2007

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“…A number of methods have been proposed for the determination of MeHg, such as, fluorimetry [5], atomic absorption spectrometry [6,7], atomic emission spectrometry [8], atomic fluorescence spectrometry [9], gas chromatography [10,11], high-performance liquid chromatography [12,13], ion chromatography [14], and capillary electrophoresis [15,16]. The different methods have been used for the determination of MeHg in water [17][18][19], soil [20][21][22], and air [23,24].…”

Section: Introductionmentioning

confidence: 99%

Determination of methylmercury fluxes across the air–water and air–soil interfaces by gas chromatography with electron capture detection

Wang

et al. 2005

Anal Bioanal Chem

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A method for the determination of methylmercury (MeHg) fluxes across the air-water and air-soil interfaces was developed using an in situ chamber. The MeHg in the air coming out of the chamber was captured by a column containing sulfhydryl cotton fiber adsorbent. MeHg was then desorbed from the column by using 2 mol L À1 HCl. The MeHg in the effluent was extracted with benzene, and determined by gas chromatography with electron capture detection. Finally, the MeHg flux was calculated using the chamber. The method was applied to simulated experiments, and the results showed that the MeHg fluxes in the air-water system were higher than those in the air-soil-water system. The method was also successfully applied to the field measurements of an environment polluted by a chemical factory, and the results showed that the MeHg fluxes across the air-soil and air-water interfaces were 0.21-3.09 and 0.14-0.79 ng m À2 h À1 , respectively. The method will be a useful tool in the environmental study of MeHg.

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“…In the literature, several methods including atomic absorption spectrometry [1,2], atomic emission spectrometry [3], atomic fluorescence spectrometry [4], gas chromatography [5,6], high-performance liquid chromatography [7,8], ion chromatography [9], and capillary electrophoresis [10,11], have been proposed for the determination of methylmercury. The detection limits of several methods were 11 ng/g [2], 4 ng/mL [3], 6 pg/mL [4], 13.2 ng/mL [8], and 100 ng/mL [9], respectively.…”

Section: Introductionmentioning

confidence: 99%

Fluorimetric determination of methylmercury as an ion-association complex with rhodamine B in the presence of iodide

Li¹,

Chen²,

2000

Fresenius' Journal of Analytical Chemistry

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A fluorimetric method for the determination of methylmercury was established. The method was based on the formation of an ionic pair between iodide-methylmercury-rhodamine B in hydrochloric acid, which can be extracted with benzene. The fluorescence emission was measured at λ ex /λ em 575/590 nm, and the experimental variables and possible interference were studied. The linear calibration range was 4 × 10 -8 mol/L ~ 5 × 10 -7 mol/L with a correlation coefficient of 0.9992. The detection limit was 1 × 10 -8 mol/L. The method was used to determine methylmercury in human hair. The recovery was in the range of 91% to 105% and the relative standard deviation was 2.8%. The results agreed with those obtained by gas chromatography with electron capture detection.

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Validation and quality control of methylmercury determinations by means of capillary electrophoresis

Cited by 29 publications

References 19 publications

Mercury speciation by CE: A review

Mercury speciation by CE: A review

Determination of methylmercury fluxes across the air–water and air–soil interfaces by gas chromatography with electron capture detection

Fluorimetric determination of methylmercury as an ion-association complex with rhodamine B in the presence of iodide

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