Elimination of interference by iodide in determination of mercury by cold-vapor AAS.

Korenaga, Takashi; Yamada, E.; Hara, Yumiko; Sakamoto, Hayao; Chohji, Tetsuji; Nakagawa, Chie; Ikatsu, Hisayoshi; Izawa, Miyoko; Goto, Masashi

doi:10.2116/bunsekikagaku.36.3_194

Cited by 11 publications

(6 citation statements)

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“…Korenaga et al 565 eliminated interference in the cold-vapor atomic-absorption spectrophotometric determination of mercury by alkaline tin(II) reduction instead of the conventional acidic reduction. Aqueous samples were digested with potassium persulfate to decompose organic-bound mercury, prior to alkaline stannous chloride addition.…”

Section: Atomic Absorption Spectrometrymentioning

confidence: 99%

Metals in River Water

Crompton

2015

Determination of Metals in Natural Waters, Sediments and Soils

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Section: Atomic Absorption Spectrometrymentioning

confidence: 99%

Metals in River Water

Crompton

2015

Determination of Metals in Natural Waters, Sediments and Soils

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“…A routine method was employed for the quantitative analysis of Hg (Korenaga et al 1987;Yamada and Korenaga 1992). An improved method was developed for mercury determination by cold-vapor AAS with acidic tin (II) after digestion of the sample.…”

Section: Quantitative Analysis Of Hgmentioning

confidence: 99%

Transmission Electron Microscopic Observation of Mercury-Bearing Bacterial Clay Minerals in a Small-Scale Gold Mine in Tanzania

Tazaki

Asada

2007

Geomicrobiology Journal

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Mercury is a toxic substance that is widely distributed throughout the hydrosphere, biosphere, and lithosphere. Mine waste environments and mine waters support a wide diversity of microbial life. The microbial ecology of environments where mine waters are polluted with heavy metals is poorly understood. Here, we describe the features of bacteria in mercury-contaminated gold panning ponds in a small-scale gold mine (Geita) near Lake Victoria, Tanzania using energy filtering transmission electron microscopy (EF-TEM) and scanning transmission electron microscopy equipped with energy dispersive X-ray spectroscopy (STEM-EDX). Most bacteria in the panning pond showed thick exopolysaccharides (EPSs), and many clay minerals attached onto the surface of EPSs. The clay minerals and EPSs might act as protective layers for the bacteria against toxic materials. The clay minerals were composed of smectite, halloysite, and kaolinite associated with calcite and goethite. Scanning electron microscopy equipped with energy dispersive X-ray spectroscopy indicated that the bulk soil samples contained abundant Si, Al, K, Ca, and Fe with heavy metals such as Au, Ti, and Ag. The results indicate that Hg pollution from panning ponds is caused by not only volatilization of Hg from AuHg amalgams, but Hg is also released into the air as dust mixed with dry fine clays, suggesting high long-term environmental risks. Mercury-resistant bacteria associated with clay minerals may have a significant effect on the weathering processes of the ore during long-term bioremediation. The clay mineral complexes on the surface of bacterial cell walls are a stimulator for Hg-resistant bacterial growth in mud ponds contaminated with the Au-Hg materials.

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“…However, it was found that iodide in the sample solution interfered with the determination of mercury by this method even after digestion (6,7,8). Recently, wastewater released from university laboratories often Storage tank of mercury wastewater have contained large amounts of iodide (9). Therefore, in this study, we used the reduction method with a copper (Q)-tin (II) chloride reduction reagent in an alkaline solution, a method which we have previously proposed (9).…”

Section: Measurementmentioning

confidence: 99%

“…Recently, wastewater released from university laboratories often Storage tank of mercury wastewater have contained large amounts of iodide (9). Therefore, in this study, we used the reduction method with a copper (Q)-tin (II) chloride reduction reagent in an alkaline solution, a method which we have previously proposed (9). The samples were taken in small amounts in order to avoid large residual amounts of mercury wastewater remaining after these experiments.…”

Section: Measurementmentioning

confidence: 99%

Leakage of mercury from chelate resin columns by chelate detaching

Chohji

Nakagawa

Hirai

et al. 1989

Environmental Technology Letters

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It is known from experience that mercury leaks from chelate resin columns which are used for mercury wastewater treatment. In this paper, one of the reasons for the mercury leakage phenomena is discussed. After shaking the synthetic mercury wastewater with chelate resin, the supernatant became turbid. Using a highly sensitive mercury analysis, it was found that the results at lower mercury concentrations deviated from the Freundlich relation. From the results, it was presumed that the chelate component was detached by friction in the process of packing chelate resin into the column, and this chelate component adsorbed mercury while passing through the column.

show abstract

Elimination of interference by iodide in determination of mercury by cold-vapor AAS.

Cited by 11 publications

References 0 publications

Metals in River Water

Metals in River Water

Transmission Electron Microscopic Observation of Mercury-Bearing Bacterial Clay Minerals in a Small-Scale Gold Mine in Tanzania

Leakage of mercury from chelate resin columns by chelate detaching

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