Extraction Chromatography of Trace Concentration of Mercury(II)

Smejkal, Z.; Tauferová, Jitka; Zeplá, Z.

doi:10.1080/10256018408545004

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…et al235/ used complexes of various metals with diethyldithiocarbamate to re-extract mercury. By using copper diethyldithiocarbamate, Smejkal et al236/ succeeded in separating Hg(II) from aqueous solutions; mercury was thereafter determined by a.a.s. at a 0.1-1 ppb level, with a relative error of 4.2-5.2%.…”

mentioning

confidence: 99%

Determination of Traces of Mercury

Luca¹,

Tanase²,

Danet³

et al. 1987

Reviews in Analytical Chemistry

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mentioning

confidence: 99%

Determination of Traces of Mercury

Luca¹,

Tanase²,

Danet³

et al. 1987

Reviews in Analytical Chemistry

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“…9 Bis(diethyldithiocarbamate) derivatives anchored on polystyrene-divinylbenzene polymers have exhibited high selectivity towards binding Hg(II) in aqueous solutions at low pH. 10,11 Recently, thiacrown derivatives have been incorporated into electrode membranes for the detection of mercury. 12 Despite these efforts in binding Hg by various agents, little focus has been applied to waste stream conditions.…”

Section: Introductionmentioning

confidence: 99%

Chemistry {ampersand} Materials Science progress report summary of selected research and development topics, FY97

Newkirk¹

1997

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UCID-20622-97 ii C&MS PROGRESS REPORT-FY97iii C&MS PROGRESS REPORT-FY97 Contents Experimental ProcedureTo investigate the initial hydriding using STM with nanometer-scale resolution, it is essential to start with a high purity, atomically flat uranium substrate. This cannot be achieved by polishing since a uranium surface oxidizes extremely rapidly in a laboratory atmosphere and consequently electron tunneling cannot be established under the STM tip. This difficulty has been overcome using laser ablation of a uranium target and consequent deposition of the ablated uranium onto highly oriented pyrolytic graphite in an ultrahigh vacuum (UHV) system with a base pressure of 6 × 10 -9 Pa. HOPG with an atomically flat surface acts as an ideal substrate. Platinum was deposited by evaporation with the sample, then annealed to create clusters of different sizes.The core of this experiment was measurement using the high spatial resolution of an STM. 3 The STM contained a cylindrical Piezo crystal which facilitated x, y, and z motion of the tip with the range of motion 1.4 mm in x and y and 0.4 mm in z. Constant-current-mode images were used with the bias voltage usually set to 500 mV (sample positive), and the tunneling current was set at 0.6 nA. ResultsFigures 1(a) and (b) show the results of 5 and 20 min exposures to di-hydrogen on samples with platinum clusters. It appears that the clusters expand as the result of hydrogen exposure, which is apparently due to the reaction of hydrogen AbstractThe surface-reaction of di-hydrogen with uranium in the presence of platinum clusters has been studied using scanning tunneling microscopy (STM), where uranium is deposited on highly oriented pyrolytic graphite (HOPG) and annealed at temperatures up to 1200°C to obtain atomically flat surfaces. Platinum clusters are then formed using evaporation from a platinum source onto the surface and subsequent annealing. Hydrogen mainly attacks uranium in the vicinity of platinum clusters and forms hydride. As a result, we have determined the hydride formation probability for the most probable cluster size, which is almost constant at 2.3 × 10 -4 over the range of exposures studied.

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