• Journal of Food Hygiene and Safety
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• v.38 no.3
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• pp.158-163
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• 2023

This study aimed to determine mercury (Hg), methylmercury (MeHg), and selenium (Se) levels in deep-sea fishes distributed in Gyeonggi-do, South Korea. Concentrations of Hg, MeHg, and Se were measured by using a mercury analyzer and Inductively Coupled Plasma - Mass Spectrometry (ICP-MS). The average content (mg/kg) in the seafood samples was as follows: Hg, 0.7647 (0.0182-5.3620), MeHg, 0.0764 (0.0096-0.8750), and Se, 0.4728 (0.1075-3.5100). All the levels of MeHg were below the recommended standards of the Ministry of Food and Drug Safety i.e., <1.0 mg/kg. Recent studies have shown that Se prevents Hg toxicity. The average daily intake in humans was 3.3 ㎍/kg, which was lower than the recommended amount (50-200 ㎍/person/day). The weekly intake of Hg and MeHg was calculated to be 6.07% and 1.90%, respectively, of the provisional tolerable weekly intake (PTWI). This study showed that the weekly intake of Hg and MeHg from abyssal fish was less than the PTWI recommended by the Joint FAO/WHO expert committee on food additives. Therefore, the levels reported in this study are presumed to be adequately safe.

• Journal of Korean Society of Environmental Engineers
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• v.27 no.11
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• pp.1205-1214
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• 2005

This study was carried out to investigate the emission characteristics of volatile metals(Hg, As, Se) and semi volatile metals such as Pb from small and medium size municipal solid waste incinerators(MSWIs). The concentrations of Hg, Pb, As and Se in emission gas from small size waste incinerators were higher than those of medium size waste incinerators. This is probably due to less air pollutant control devices and high emission gas temperature of the small size waste incinerators relative to the medium size waste incinerators. Emission gas temperature from small and medium size waste incinerators were divided into 2 groups. The first group was about $100^{\circ}C$ and the second roup in the range of $400{\sim}700^{\circ}C$. The concentrations of emission gas at the second group were Hg $70.43\;{\mu}g/Sm^3$, Pb $0.94\;{\mu}g/Sm^3$, As $9.83\;{\mu}g/Sm^3$ and Se $5.05\;{\mu}g/Sm^3$. The concentrations of Hg, Pb, As and Se at the first group were lower than those found at the second group. Besides, the removal efficiencies of Hg in medium size waste incinerators were $55.2{\sim}95.9%$. Emission gas temperature reduction from waste heat boiler(WHB) contribute to control of Hg. Based on above results, we postulate that the temperature of flue gas should play a very important role in volatile metal control in small and medium size MSWIs. In order to improve the volatile metals removal efficiency, the temperature of cooling system must be controlled and the air pollution control device should be operated properly.

• YAKHAK HOEJI
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• v.43 no.5
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• pp.577-583
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• 1999

Concentrations of heavy metals, including As, Cd, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Se, Si, Sn, V and Zn in the internal organs (liver, kidney, heart, lung, spleen, cerebrum and bone) of Korean obtained from 91 forensic medical autopsy cadavers, with an age range of 12-87 years, were determined by inductively coupled plasma atomic emission spectrometry. From the results, positive correlation with age was observed in the following cases : Cd in liver, kidney and cerebrum; Fe in cerebrum and bone; Pb in bone; v in lung. Copper in heart, Hg in bone and Mn in kidney correlated negatively with age. A significantly positive correlation between Se and Hg was only observed in heart. Significant correlation coefficients between Se and As were observed in liver, kidney, heart spleen and bone. The correlation between Cd and Zn was significant in liver and kidney, indicating that the distribution of Cd is similar to that of Zn in the liver and kidney.

• Journal of the Korean Society of Radiology
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• v.3 no.2
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• pp.11-16
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• 2009

Mercury Iodide as good sensitivity at radiation and has an easy peculiarity that operates at low voltage for other photoconductors(a-Se, a-Si, Ge, etc) Based on this characteristic, we studied about an efficiency of the digital x-ray detector in acccordance with the thickness of photoconductor. To solve the problem that is difficult to make a large area film using PVD(Physical Vapor Deposition)method, we used a PIB(Particle In Binder)method. To make a binder paste, we used a PVB(Polyvinylbutyral) as a binder and a DGME(Diethylene Glycol Monobutyl Ether), DGMEA(Diethylene Glycol Monobutyl Ether Acetate) as a solvent. Using this binder paste, we made a polycrystal mercury iodide film that has an each thickness. To evaluate the electrical properties of this films, we measured a darkcurrent, sensitivity and SNR(Signal to Noise Ratio). Mercury iodide film of the 200um thickness has good electrical properties as a result of the measurement. From this result there is a good chance that replace the existing a-Se(Amnorphous seleinum; a-se) with the mercury iodide.

• YAKHAK HOEJI
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• v.45 no.5
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• pp.460-467
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• 2001

Heavy metals, such as Al, As, Cd, Cr Cu, Fe, Hg, Mn, Mo, Ni, Pb, Se, Si, Sn, V and Zn, were analysed on kidney cortex and medulla of Korean obtained from 154 forensic medical autopsy cadavers. Heavy metals were analysed by inductively coupled plasma atomic emission spectrometry In kidney cortex, the concentrations of Al, Cd, Cu, Mn, Mo, Pb, Se, Si and Zn were significantly higher than in the kidney medulla (Cd, Cu, Mn, Mo, Zn : p<0.01, AA, Pb, Se, Si : p<0.05). No significant local differences were found between kidney cortex and kidney medulla in the concentrations of As, Cr Fe, Hg, Ni, Sn and V. In kidney cortex and kidney medulla, Cd concentrations correlated positively with age, but Mn concentrations correlated negatively with age. A significantly positive correlation between Cd and Zn, Cd and Cu, Zn and Cu, Al and Si, Se and As was found in kidney cortex and kidney medulla. A significantly positive correlation between Hg and Se was only observed in kidney cortex. These results indicate that the distribution of hazardous heavy metals is similar to that of essential elements in the tissues.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.11a
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• pp.494-497
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• 2004

본 연구는 방사선 영상센서 적용을 위한 $HgI_2$ 필름의 특성 평가에 관한 것으로서 X-선 조사조건별 인가전압에 따른 검출신호 특성을 조사하였다. 기존의 $HgI_2$ 검출기의 경우 신호량이 크다는 장점이 있으나 노이즈의 양이 크다. 이에 대한 해결책으로 보호층을 삽입하나 이 경우 X-선 조사에 따른 시간 응답 특성이 있어서 전하트랩현상(tailing effect)에 의한 영향이 크게 존재하였다. 따라서 본 논문에서는 이러한 문제점을 해결하고자 보호층으로써 a-Se 을 삽입하여 기존의 $HgI_2$ 검출기에서 사용되어지는 parlyene이 삽입된 검출기와 전기적 특성을 측정, 비교해보고자 한다. 제작방식으로는 대면적 제작이 용이한 스크린 프린팅 방식을 이용하여 두께 $140\;{\mu}m$와 $3\;cm\;{\times}\;2\;cm$ 면적으로 제조하였다. 측정결과, a-Se을 보호층으로 사용한 $HgI_2$ 필름이 민감도는 거의 비슷하나 누설전류가 안정화 되는데 걸리는 감소시간(decay time)이 parlyene을 사용한 구조에 비해 훨씬 낮았다. 또한 X선에 대한 민감도는 기존의 a-Se에 비해 월등히 높아 적은 방사선 조사량(radiation dose)에서도 신호검출이 가능하여 저선량이 요구되는 방사선 투시촬영(digital fluoroscopy) 적용에 유용할 것으로 기대된다.

• Analytical Science and Technology
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• v.10 no.6
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• pp.395-402
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• 1997

The comparison study between EPA method 3050 and the test method offered by Ministry of Environment in Korea was performed to investigate a matrix effect on extraction. In this study, 12 inorganic priority pollutants(Cd, Cr, Cu, Pb, Ni, Zn, As, Sb, Se, Hg, Be, Tl) were spiked to the sludges and estuary sediment samples. The extracts were analyzed by AAS, HG-AAS, and ICP/MS. Results were discussed in terms of recoveries, relative standard deviations, and the method detection limits. Mean recovery of the elements except As, Sb, and Se was 93% when the procedure of EPA method was applied. The Korean extraction method, however. showed a significant matrix effect to give very poor recoveries.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.11a
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• pp.456-459
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• 2004

Analog film/screen systems have been being changed to a digital x-ray imaging device using direct conversion materials. Photocoductors for a direct detection flat-panel imager require high x-ray absorption, ionization and charge collection, low leakage current and large area deposition. In this work, $HgI_2$ films with excellent properties for x-ray detector were deposited by screen printing method. The thickness of $HgI_2$ film was about $150\;{\mu}m$. The passivation layer is fabricated using a-Se and parlyene, the both fabrication $HgI_2$ film were compared for analyzing the leakage current reduction. We measured electrical properties-leakage current, photosensitivity, SNR though I-V measurement, As the result, $HgI_2$ film using a-Se passivation layer had the greater

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.28 no.4
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• pp.257-261
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• 2015

In this study, we fabricated a thermoelectric module made of nanoparticles (NPs) and glass fibers investigated its thermoelectric characteristics. P-type HgTe and n-type HgSe NPs synthesized by colloidal method were used as thermoelectric materials and glass fibers were used as spacers between the hot and cold electrodes of the thermoelectric module. In the module, the average Seebeck coefficients of the HgTe and HgSe NPs were 1260 and $-628{\mu}V/K$, respectively. The p-n module generated about a voltage of 11.9 mV and showed a power density of $1.6{\times}10^{-5}{\mu}W/cm^2$ at a temperature difference of 7.5 K.

• Analytical Science and Technology
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• v.25 no.6
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• pp.339-344
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• 2012

In this research, hydride generation in HPLC-ICPMS for the selenium speciation was investigated. Chemical and photochemical vapor generation techniques were compared for the effective generation of selenium vapour. $HBr/KBrO_3$ was used for the chemical reduction and a UV lamp was used for the photochemical reduction. It was found out that the photochemical reduction was more effective than the chemical reduction in all of selenium species studied. The optimum conditions for the generation of vapour are 0.4% KI, 2.5% $NaBH_4$, and 1.0 M HCl. The enhancement factor using a photochemical hydride generation was from 6.3 to 16.7 times for inorganic and organic selenium species.