Speciation analysis of mercury and tin compounds in water and sediments by gas chromatography–mass spectrometry following preconcentration on C60 fullerene

Mercury speciation in seawater by liquid chromatography-inductively coupled plasma-mass spectrometry following solid phase extraction pre-concentration by using an ionic imprinted polymer based on methyl-mercury–phenobarbital interaction

“…Similarly, values of 11, 6.7, and 7.0 ng L −1 were obtained as LOQ for Hg(II), Me-Hg, and Et-Hg, respectively. As summarized in Table 3, LODs achieved are similar than those previously obtained by other authors when using other adsorbents for off-line SPE pretreatment before HPLC-ICP-MS detection [16,18], HPLC-UV [17], and GC-MS [13]. LOD achieved are lower than those reported when using UV spectophotometry [14], mass spectrometry [12], and cold vapour atomic fluorescence spectrometry (CV-AFS) [15] as detection systems for HPLC (Table 3).…”

“…Recent applications for mercury speciation include anion (quaternary amine type [7], and SAX [8]), and cation (SCX, benzenesulfonic acid-type) [9,10] exchange resins; and also polymeric resins, mainly reverse phase C18 [11][12][13][14][15][16][17][18]. The latter solid supports require mercury species complexation to enhance analyte interaction with the sorbent [11][12][13], or the immobilization of the complexing reagent on the C18 particles [14][15][16][17][18].…”

Solid Phase (Micro)extraction Tools Based on Carbon Nanotubes and Related Nanostructures

“…In order to obtain discriminated information on the sample composition, a chromatographic separation can be implemented after the analysis of the sample by an atomic technique to estimate the total concentration of the target metals in the sample. Such is the case of the determination of lead and alkyllead compounds in rainwaters (Baena et al, 2000) or organometallic compounds in environmental samples (Muñoz et al, 2005 Reducing the dimensions of the extraction units for carbon nanotubes was also aimed at minimizing the aggregation of the nanoparticles which negatively affects to the retention efficiency. Therefore, Suárez et al proposed the package of 6 mg of MWCNTs in the minicolumn, which was further located in the loop of the injection valve.…”

Proposal for a mercury isolation procedure using cold vapor method in combination with voltammetric determination using a rotating gold electrode

“…Many authors have used this method for determination of mercury in various environmental samples, e.g., in water [3], urine [4], gasoline [5], or in fishes [6] achieving detection limits from 0.1 to 2.1 µg L −1 . Also the gas [7,8] and liquid [9] chromatography with different detecting systems or capillary zone electrophoresis [10] have been applied for mercury determination. But all mentioned methods are instrumentally complicated and also sample preparation is often complicated too.…”