On-line preconcentration and determination of ultra trace amounts of mercury using surfactant coated alumina modified by dithizone with cold vapor atomic absorption spectrometry

Hg2+ion-imprinted polymers sorbents based on dithizone–Hg2+chelation for mercury speciation analysis in environmental and biological samples

“…37 Talpur et al used surfactant coated alumina modied by dithizone for the preconcentration and determination of trace amounts of mercury coupled with cold vapor AAS. 38 On the other hand, sol-gel technology, an easy-to-handle and ecofriendly strategy, has ourished for the synthesis of IIPs and MIPs. …”

“…[36][37][38] For instance, Liu and his coworkers developed a dithizone-functionalized SPE procedure followed by HPLC-ICP-MS for mercury in water samples. 37 Talpur et al used surfactant coated alumina modied by dithizone for the preconcentration and determination of trace amounts of mercury coupled with cold vapor AAS.…”

Atomic spectrometry update: review of advances in the analysis of clinical and biological materials, foods and beverages

“…60, 77 Cacho et al 60 described the unique use of an electrochemical ow through cell for the on-line pre-concentration of Se in water samples. Chandio et al 55 described the use of an on-line pre-concentration procedure with a modied alumina adsorbent for the measurement of Hg in water and foodstuffs. The procedure had an LOD of 0.01 mg L À1 and accuracy was demonstrated using a number of CRMs and comparison against results by ICP-MS.…”

Vapor generation – atomic spectrometric techniques. Expanding frontiers through specific-species preconcentration. A review

“…Since only few atomic spectrometric techniques are selective for the determination of species, sample pretreatments becomes a prominent feature that enables the possibility to discriminate between total content of a trace element and the content of each individual chemical form in which it occurs. The quantitation of individual forms of an analyte is termed speciation analysis (specific-species determination); and most analytical methods employed for speciation involve the hyphenation of an atomic spectrometric detector with a separation technique namely chromatography (LC or GC) [7,12,[16][17][18][19][20][21][22][23][24], capillary electrophoresis (CE) [25][26][27], solid phase extraction (SPE) [13,[28][29][30][31][32][33][34][35][36][37], liquid-liquid extraction (LLE) with its variants [38][39][40][41][42][43], among others. The vapor generation is thus a derivatization step after the separation process that preconcentrate further the analyte(s) with considerable improvements in selectivity [6].…”