Methylmercury extraction from aquatic sediments

Speciation of mercury using capillary electrophoresis coupled to volatile species generation-inductively coupled plasma mass spectrometry

“…1, 21 which essentially follows the well-known Westo ¨o ¨procedure. 22,23 Final aqueous extracts were subjected to capillary electrophoresis separation.…”

“…4B. Since the procedure used to prepare the sample 22,23 consists of methylmercury released from proteins using HCl and methylmercury extraction, as the chloride compound, with an organic solvent (benzene or toluene), only methylmercury was detected in the extract. The amount of methylmercury present in the sample was quantified by using a simple external calibration method based on peak area measurements.…”

Environmentally friendly sample treatment for speciation analysis by hyphenated techniques

“…129 Other approaches for cationic methylmercury species used a complexation with carbamate compounds 130 or methanol modified carbon dioxide SF. 131 In the case of alkyllead compounds, SFE with methanol modified carbon dioxide enabled quantitative extraction of trimethyl-and triethyl-lead from spiked sediments, while complexation with diethyldithiocarbamate was needed for diethyllead. 132,133 Fluorinated dithiocarbamate and methanol modified carbon dioxide were also used for selective extraction of Cr(VI) from solid samples.…”

“…135 As already mentioned, SFE has been primarily used as the pretreatment technique for the separation of species by GC. In many applications, typical gas chromatographic detectors were used, 116,118,131 however the trend to replace them by more sensitive, atomic specific detectors can be observed. 118,121,122,125,128,129…”

Acoplamento cromatografia gasosa - espectrometria de absorção atômica em estudos de especiação: uma revisão

“…Não está no escopo deste artigo a discussão do pré-tratamento de amostras com vistas à especiação, uma vez que boas revisões podem ser encontradas na literatura [106][107][108][109] . Entretanto, deve-se apontar que extrações assistidas por microondas com o uso de soluções ácidas diluídas [110][111][112][113][114] , assim como a microextração em fase sólida (SPME) [115][116][117][118][119] , vem mostrando ser procedimentos bastante promissores.…”