• 한국환경보건학회지
• /
• 제21권3호
• /
• pp.96-101
• /
• 1995

A selective and highly sensitive spectrophotometric measurements have been developed for the determination of trace mercury(II) with thiosulfate and PAR. Hg(II)-thiosulfate complex was extracted into high molecular alkylamine such as quaternary ammonium salt and back extracted into 1 M-HCl solution. The Hg(II)-PAR complex has maximum absorbance at 499 nm and obeys Beer's law in the range of 0.04~1.0 $\mu g/mL$ of mercury(II). The molar absorptivity and Sandell's sensitivity are $6.27\times 10^4 L.mole^{-1} cm^{-1}$ and $3.2\times 10^{-3}g/cm^2$ respectively.

• Journal of Photoscience
• /
• 제1권1호
• /
• pp.47-52
• /
• 1994

Effects of HgCl$_2$-treatment on electron transport, chlorophyll a fluorescence and its quenching were studied using isolated barley (Hordeum vulgare L. cv. Albori) chloroplasts. Depending on the concentration of HgCI$_2$, photosynthetic oxygen-evolving activities of photosystem II (PS II) were greatly inhibited, whereas those of photosystem I (PS I) were slightly decreased. The inhibitory effects of HgCl$_2$ on the oxygen-evolving activity was partially restored by the addition of hydroxyamine, suggesting the primary inhibition site by HgCl$_2$2-treatment is close to the oxidizing site of PS tl associated with water-splitting complex. Addition of 50 $\mu$M HgCI$_2$ decreased both photochemical and nonphotochemical quenching of chlorophyll fluorescence. Especially, energy dependent quenching (qE) was completely disappeared by HgCl$_2$-treatment as observed by NH$_4$CI treatment. In the presence of HgCI$_2$, F'o level during illumination was also increased. These results suggest that pH gradient across thylakoid membrane can not be formed in the presence of 0 $\mu$M HgCl$_2$. In addition, antenna pigment composition might be altered by HgCl$_2$-treatment.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
• /
• pp.973-976
• /
• 2004

The results of numerous studies in III-V semiconductors show that sulfur treatment improves the electrical parameters of III-V compound devices. In this article, we examine the effects of sulfidation of HgCdTe surface on the interfacial characteristics of metal-ZnS-HgCdTe structures. Different from sulfidation in III-V material, S can not be act as an impurity because II-S compounds (ZnS, CdS) generally used as passivant for HgCdTe. Our studies of sulfur-treatment on HgCdTe surface show that sulfur agent forms the S- S, II-S bonds at the surface layer. These bonds are very effective to improve the electrical properties of ZnS layer on HgCdTe by reducing the possibility of native oxides formation. After the sulfidation process, MIS capacitors of HgCdTe show great improvement in electrical properties, such as low density of fixed charge and reduced hystereisis width.

• 대한화학회지
• /
• 제57권6호
• /
• pp.712-720
• /
• 2013

Microwave assisted syntheses of Zn(II), Cd(II) and Hg(II) complexes with 3-aminopyridine (3AP) and nitrite ($NO_2{^-}$) ions have been reported. The metal complexes were characterized by elemental analyses, molar conductance, IR, Far-IR, electronic, NMR ($^1H$, $^{13}C$), thermal and electron impact mass spectral studies. The spectroscopic studies reveal the composition, the nature of nitrite ligand in the complexes, electronic transitions, chemical environments of C and H atoms thermal degradation of the complexes. On the basis of characterization data, distorted tetrahedral geometry is suggested for Zn(II), Cd(II) and Hg(II) complexes. The organic ligand (3AP) and their metal complexes were screened against gram negative pathogenic bacteria and fungi in vitro. The results are compared with our previous report J. Korean Chem. Soc. 2013, 57, 341 on 4-aminopyridine and nitrite ion complexes of the same metal ions.

• 한국식품과학회지
• /
• 제16권4호
• /
• pp.392-397
• /
• 1984

Rhiz. oryzae가 생산(生産) 정제효소(精製酵素) glucoamylase I (G I) 과 glucoamylase II (G II) 의 gel filtration에 의(依)하여 추정(推定)된 분자량(分子量)은 120,000, 127,000이었다. glucoamylase I 과 II 의 등전점(等電点)은 각각(各各) pH 7.25. pH 7.75 이었고 반응(反應) 최적온도(最適溫度)는 다같이 $50^{\circ}C$, 안정온도범위(安定溫度範圍) 는 다같이 pH5.0부근(附近)이었으며 안정(安定)pH범위(範圍)는 각각(各各) $pH3.5{\sim}8.0$, $pH4.5{\sim}8.0$이었다. 가용성전분(可溶性澱粉)에 대(對)한 Michaelis 상수는 glucoamylase I 이 4.545mg/ml, glucoamylase II 가 5.560mg/ml이었다. glucoamylase I 은 $Hg^{++}$, $Pb^{++}$, p-CMB, IAA에 의하여, glucoamylase II는 $Hg^{++}$, $Mn^{++}$, p-CMB, IAA에 의하여 저해(沮害)되었다.

• Bulletin of the Korean Chemical Society
• /
• 제30권12호
• /
• pp.3109-3112
• /
• 2009

• 대한화학회지
• /
• 제55권1호
• /
• pp.38-45
• /
• 2011

전이금속 이온인 수은(II) 및 은(I)에 대한 $\alpha$-케토안정화된 일리드화 인 $Ph_3P$=CHC(O) $C_6H_4$-X (X=Br, Ph)의 착물 반응 행동을 연구하였다. 수은(II) 착물 {$HgX_2$ [Y]} 2 ($Y_1$=4-bromo benzoyl methylene triphenyl phosphorane; X=Cl(1), Br(2), I(3), $Y_2$=4-phenyl benzoyl methylene triphenyl phosphorane; X=Cl(4), Br(5), I(6))는 $Y_1$ 및 $Y_2$를 $HgX_2$ (X=Cl, Br, I)와 각각 반응시켜 제조하였다. $\alpha$-케토안정화된 일리드화 인($Y_2$)의 은(I) 착물 [Ag$(Y_2)_2$] X(X=$BF_4$(7), OTf(8))는 이러한 일리드와 AgX(X=$BF_4$, OTf)를 아세톤에서 반응시켜 얻었다. 착물 (1)과 (4)의 결정구조를 고찰하였다. 일리드의 C-배위 이핵착물과 트랜스-구조의 착물$[Y_1HgCl_2]_2$. $CHCl_3$ (1) 및 $[Y_2HgCl_2]_2$ (4)를 형성하는 이들 반응에 대해 단결정 X-선 분석을 통해 고찰하였다. 모든 착물(1-3)은 IR, $^1H$ 및 $^{31}P$ NMR 뿐만아니라 $^{13}$CNMR을 통하여 확인하였다.

• 한국환경과학회지
• /
• 제29권2호
• /
• pp.201-207
• /
• 2020

A new chemosensor based on a self-assembled system has been devised to detect Hg²⁺ions efficiently. We demonstrated that the amphiphilic building blocks consisting of pyrene and boronic acid (1) aggregate in aqueous solutions and provide an outstanding sensing platform for sensitive detection. The self-assembled 1 exhibited high selectivity and sensitivity for Hg²⁺ion detection via fluorescence quenching, where the Hg²⁺ion detection ensued from a fast transmetallation of 1. The Stern-Volmer (SV) quenching constant for its fluorescence quenching by Hg²⁺ions was approximately 1.58 × 10⁸ M^-1. In addition, self-assembled 1 exhibited excellent sensing abilities at nano-molar concentration levels when tap water and freshwater samples were contaminated with of Hg²⁺ ions.

• 한국해양학회지
• /
• 제10권1호
• /
• pp.33-40
• /
• 1975

본 연구의 결과를 간단히 요약하면 다음과 같다. 가. KCl수용액에서의 Dowex 1-X8, Cl$^{-}$(200-400메쉬)에 의한 Hg(II), Cd(II) 및 Zn(II)의 흡착메카니즘은 고농도의 KCl수용액에서는 모두 음이온의 MCl$_{4}$ $^{2-}$ 착이온 형성에 의한 흡착이며, 저농도에서는 착이온 안정도상수가 큰 Hg(II) 는 역시 착이온 형성에 의한 흡착인데 비해 Cd(II)와 Zn(II)의 경우는 농도에 따라 다르다. 한편 D값의 크기순위는 HCl메디움에서의 MCl$_{4}$$^{2-}$ 착이온의 안정도 상수의 크기순위와 일치한다. 나. KCl-Methonol메디움에서의 Dowex 1-X8, Cl$^{-}$수지에 대한 금속이온의 흡착은 메탄올의 농도증가에 따라 증가되는데, 이것은 메탄올 첨가로 인해 수화현상이 약화되어 착이온 형성이 용이해지기 때문이며 착이온을 잘 형성하는 Hg(II)의 경우는 그 증가율이 크지 않았다. 다. 양이온교환 수지 Dowex50W-X$_{8}$ , $K^{+}$column내에서 KCl-H$_{2}$O 및 KCl-MeOH 용리액에 의한 Zn(II), Cd(II) 및 Hg(II)의 융리메카니즘은 역시 금속이온의 MCl$_{4}$$^{2-}$ 착이온 형성 및 이온쌍 형성의 차이로 용리되는데 그 부피분배 계수의 크기는 Zn(II)>Cd(II)>Hg(II)이며, MeOH의 농도가 증가하면 더욱 빨리 용리되는데 이는 역시 MeOH첨가에 인한 착이온 및 이온쌍 형성이 증대되기 때문이다. 라. MCl(M:K$^{+}$, $Na^{+}$, NH$_{4}$$^{+}$ 및 H$^{+}$) 수용액 메디움에서의 Cd(II), Mg(II) 및 Zn(II)의 Dowex 1-X8, Cl$^{-}$ 수지에 대한 흡착은 역시 어떤 메디움에서도 Cd(II) 흡착이 제일 크며, 다음이 Zn(II) 이고 착이온을 형성않는 Mg(II)이 제일 작았다. 한편 메디움 종류별 D값의 크기순위는 H$^{+}$>K$^{+}$> $Na^{+}$>NH$_{4}$$^{+}$이였다. 메디움의 종류에 따라 D값의 차이가 나는 것은 금속이온의 착이온 형성과 금속이온의 용액내에서의 이온종의 상태와 관련이 있다고 생각된다. 마. MCl(M:K$^{+}$, $Na^{+}$, NH$_{4}$$^{+}$ 및 H$^{+}$)과 MNO$_{3}$ 용리액에 의한 Cd(II), Mg(II) 및 Zn(II)의 용리는 예상한 바와 같이 MCl에서 작은 Dv 값을 갖는데, 이것은 CdCl$_{4}$$^{2-}$ 착이온을 형성하거나 ZnCl$_{4}$$^{2-}$ , ZnCl$_{3}$$^{-}$같은 이온과 MgCl$^{+}$, MgCl$_{2}$같은 이온종을 형성하기 때문인것 같다. 한편 어떠한 용리액에서던지 NH$_{4}$$^{+}$의 경우 Dv값이 제일 작았다. 바. 본 연구의 목적중의 하나인 인체유해 중금속이온인 Hg(II), Cd(II)등이 NaCl같은 염화물이 함유된 시료용액에 공해이온으로 존재할 경우 흡착에 의한 제거가 가능하다. 한편 이같은 중금속이온의 흡착실험은 특히 해수중의 금속이온의 회수연구에도 그 활용이 가능하리라고 믿는다.

• Environmental Engineering Research
• /
• 제20권1호
• /
• pp.33-39
• /
• 2015

Mercury is a toxic pollutants present in different types of industrial effluents and is responsible for environmental pollution. Removal of Hg(II) ions from synthetic wastewater was studied using the activated biocarbon produced from the leaves of Tridax procumbens (Asteraceae). The particle size of the biocarbon (BC) is in the range of $100-120{\mu}m$. The effects of initial metal ion concentration, pH, contact time, and amount of biocarbon on the biosorption process were studied at temperature of $28{\pm}2^{\circ}C$. Batch experimental studies showed that an equilibrium time of 160 min was required for the maximum removal of Hg(II) at the optimized biocarbon dose of 2.5 g per 100 mL of synthetic wastewater. The optimum pH required for maximum removal (96.5%) of Hg(II) ions was found to be 5.5. The biosorption of metal ions onto activated biocarbon surface is probably via an ion exchange mechanism. The biocarbon can be regenerated with minimum loss. Further, it can be reused without any chemical activation. The findings of the research suggested that, the biocarbon produced from cost effective renewable resources can be utilized for the treatment of industrial wastewater.