• 한국환경보건학회지
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• 제14권2호
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• pp.65-71
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• 1988

In this study, the method of adsorption by activated carbon in the removal of Hg(II) ion in waste water was treated. The influence of kinds of activated carbon and effect of temperature and the influence of coexistent salt on adsorption rates, the influence of pH in the adsorption, equilibrium and adsorption of mercury from activated carbon were investigated. From the adsorption on activated carbon of mercury(II) ion in the presence of cyanide or thiocyanate ion was found that mercury(II) was easily adsorved onto the activated carbon in the form of complex artion such as Hg(CN)$_4^{2-}$, Hg(SCN)$_4^{2-}$ respectively. ZnCl$_2$ activation method had a higher adsorptive ability than steam activation method in adsorption of Hg on activated carbon. Activated carbon adsorbed iodide ion is very effective on adsorption of Hg.

• Bulletin of the Korean Chemical Society
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• 제15권10호
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• pp.836-841
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• 1994

The polymer matrix effect on the selectivity, response rate and reproducibility for coextraction type anion-selective optode membranes were investigated with DOA-plasticized PVC, PVC/hydroxylated PVC, PU/hydroxylated PVC and DOS-plasticized CTA matrices. Optode membranes were prepared with TDMACl and ETH2412 dissolved in one of the four solvent polymeric matrices. The PU/hydroxylated PVC and PVC-based membranes have almost the same selectivity coefficients, while the CTA-based membrane is more selective toward lipophilic anions. The membrane with PU/hydroxylated PVC adhered strongly to a glass surface, and showed highly reproducible and relatively rapid response. Very poor adhesion of PVC/hydroxylated PVC and CTA-based membranes limited the usability of those membranes as sensor components. Based on these results, and considering the biocompatibility for clinical samples, the optode made with PU/hydroxylated PVC was applied to determine the thiocyanate ion in human saliva. The results obtained with this simple device were comparable to those with rather complicated ISE methods.

• 대한화학회지
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• 제12권4호
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• pp.139-141
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• 1968

液狀이온交換體 Amberite LAI을 chloroform에 10%로 묽혀서 鹽酸算性에서 Bi(III), As(III), Sb(III), Zn(II) 및 Fe(III)의 推出率을 試驗한 結果, Zn(II)는 2M에서 98%. As(III)는 7~14M에서 Sb(III)는 2~4M에서 , Fe(III)는 6~10M에서 蒼鉛과 定量的으로 分離되었다. 그리고 chloroform을 溶媒로 썼을 때는 xylene이나 hexane을 溶媒로 썼을때보다 더 急傾斜를 이루는 推出率曲線을 나타냈다. 各各의 不純物을 分離後 Zn(II)는 dithizone. As(III)는 Gutzeit method, Sb(III)는 brilliant green, Fe(III)는 thiocyanate에 依한 比色方法으로 定量하였다.

• 한국안전학회지
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• 제6권4호
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• pp.13-20
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• 1991

Ion-selective electrode responsive to the thiocynate ion prepared by using the quaternary ammonium salts as a active material and PVC as a membrane matrix. The effect of chemical structure and composition of active material, and the membrane thickness on the linear response. the detection limit, and Nernstian slope of the electrode studied. Under the above optimum conditions of membrane, the effect of pH and the selectivity coefficients to various interfering anions were compared and investigated. It was concluded that the functions of thiocynate ion-selective electrode(ISE) were closely related to the chemical structure of the quaternary ammonium salts. The linear response, and the detection limit of the electrode potential increased with the increase of the carbon chain length of the alkyl group in the quaternary ammonium salts in the ascending order of Aliquat 336T, TOAT, TDAT, and TDDAT. The optimum membrane thickness was 0.3mm. The electrode characteristics was better with the decrease of the concentration of active material, and the best concentration was 3 weight percent. The membrane potential was independent of the pH variation in the region from pH 2 to 12. The order of the selectivity coefficients is as follows：Cl $O_4$$^{[-10]}$ ＞ $I^{[-10]}$ ＞N $O_3$$^{[-10]}$ ＞B $r^{[-10]}$ ＞ $F^{[-10]}$ ＞C $l^{[-10]}$ ＞O $A_{c}$ $^{[-10]}$ 〓S $O_4$$^{2-}$.

• 대한화학회지
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• 제5권1호
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• pp.42-47
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• 1961

A titration of a small amount of iron with standard potassium ferrocyanide using potassium thiocyanate as indicator has been studied. A sample solution containing $0.1{\sim}1.0$ mg. $Fe^{3+}$ in 60 ml. is pipeted into 100 ml. Erlenmyer flask and the pH of the solution is adjusted to $1.5{\sim}3.0$ with 0.1 N or 1 N $HNO_3$ and $NH_4OH.$ To this solution one ml. of 1 M KCNS solution as indicator is added. The solution colored by iron thiocyanate complex is titrated with 1/200 M or 1/400 M standard solution of potassium ferrocyanide from a 5 ml. micro-buret. Near the end point, when the color of sample changes from deep red to green, about 20 ml. of ether is added and shake the flask vigorously. The red color is extracted to the ether layer. To settle the ether layer a few drops of ethanol is added and then standard solution is added dropwise and shake vigorously. The end point is reached when the color of the ether layer disappears owing to the quantitative formation of $Fe_4[Fe(CN)_6]_3.$ In this titration, 0.lmg. of $Fe^{3+}$ can be determined within 1.0% of titration error, provided the following optimum conditions, i.e., pH $1.5{\sim}3.0$, final concentration of KCNS indicator; $0.01{\sim}0.02M$, at room temperature. The titration found to be interfered by the presence of slightly soluble salts, stable complex forming ions and the ions which would be reduced by ferrocyanide or oxidized by ferric ion.

• 한국식품저장유통학회:학술대회논문집
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• 한국식품저장유통학회 1993년도 정기총회 및 제3차 학술발표회
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• pp.12-13
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• 1993

십자화과 채소에는 여러종류의 glucosinolate가 존재하며 이들 중 특히 indolw형 glucosinolate는 여러가지 요인에 의해 분해되어 항암효과를 나타내는 물질들을 생성한다고 보고 되고 있다. 이에 다라 우리나라 농가에서 대량 생산되고 있는 십자화과 채소인 배추 및 무에서 항암전구물질인 indole glucosinolate를 포함한 glucosinolate를 분석 및 동정하고 가공처리조건에 따라 항암물질인 indoleacetonitrile과 indolemethanol의 함량을 측정하였다. 1. GC 및 GC-MS를 이용하여 배추, 무의 품종별 ; 이들 씨에서 4-8종류의 glucosinolate를 동정하였다. 2. Thymol에 의한 총 glucosinolate의 함량은 배추 및 무에서는 복돌이 배추와 왕관무가 3.21, 2.0$\nu$mole/g으로 가장 많았고 배추씨, 무씨에서는 각각 6.38, 4.07$\nu$mole/g이었다. 3. 배추 및 무의 저장중 총 glucosinolate함량은 저장 기간이 지남에 따라 점차 감소하는 경향이였다. 4. 열처리 시간에 따른 배추와 무의 indoleacetonitrile함량은 열처리 시간이 지남에 따라 증가하며 40분 열처리시 최대치를 나타내었다. 5. indolemethanol이 생성될때 방출되는 배추, 무, 배추씨 및 무씨의 Thiocyanate ion의 함량은 열처리 시간이 지남에 따라 증가하며 40분 열처리시 최대치를 나타내었으며 자가분해에 따른 함량도 분해시간이 경과함에 따라 증가하며 30분경과시는 최대치를 나타내었고 이는 40분 열처리시보다 많은 함량이였다.함량이였다.

• Bulletin of the Korean Chemical Society
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• 제24권3호
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• pp.384-388
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• 2003

The emission and excitation spectra of $cis-[Cr(cyclam)(NCS)_2]NCS$ (cyclam = 1,4,8,11-tetraazacyclotetradecane) taken at 77 K are reported. The infrared and visible spectra at room temperature are also measured. The vibrational intervals due to the electronic ground state are extracted from the far-infrared and emission spectra. The ten pure electronic origins due to spin-allowed and spin-forbidden transitions are assigned by analyzing the absorption and excitation spectra. Using the observed transitions, a ligand field analysis has been performed to determine the bonding properties of the coordinated ligands in the title chromium(Ⅲ) complex. According to the results, it is found that nitrogen atoms of the cyclam ligand have a strong σ-donor character, while the NCS ligand has medium σ- and π-donor properties toward chromium(Ⅲ) ion.

• Bulletin of the Korean Chemical Society
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• 제35권11호
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• pp.3175-3180
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• 2014

A potentiometric sensor based on the 1-benzyl-3-(4-nitrophenyl) thio-urea was synthesized and tested as an ionophore in PVC based membrane sensor towards $SCN^-$ ions. This membrane exhibits a linear stable response over a wide concentration range ($1.0{\times}10^{-5}$ to $1.0{\times}10^{-2}M$) with a slope of -59.2 mV/dec., a detection limit of ${\log}[SCN^-]=-5.05$, and a selectivity coefficient for thiocyanate against perchlorate anion of ${\log}K^{pot}_{SCN^-j}=-0.133$. The selectivity series of the membrane is as follows: $SCN^-$ > $ClO_4{^-}$ > $I^-$ > $NO_3{^-}$ > $HSO_3{^-}$ > $Cl^-$ > $HSO_4{^-}$ > $F^-$ > $CH_3COO^-$ > $HCO_3{^-}$ > $Br^-$ > $H_2PO_4{^-}$ > $SO{_3}^{2-}$ > $SO{_4}^{2-}$ > $CO{_3}^{2-}$. The proposed electrode showed good selectivity and a good response for the $SCN^-$ ion over a wide variety of other anions in pH 6.0 buffer solutions and has a fast response time of about < 5s. The influences of the membrane by pH, ionophore, and plasticizer were studied.

• 공업화학
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• 제24권4호
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• pp.423-427
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• 2013

본 연구에서는 코크스공장의 Coke Oven Gas (COG) 정제 과정에서 발생되는 폐수의 특성을 규명하고 폐수를 안정적으로 처리하기 위한 최적 운전조건을 도출하였다. 코크스 제조공장에서 발생되는 폐수 중에는 미생물에 유해한 $S^{-2}$, $SCN^-$이 각각 6.8~11.2 mg/L, 190~320 mg/L로 높은 농도로 함유되어 있다. $S^{-2}$ 이온농도가 10 mg/L 이하인 경우 활성슬러지의 $SV_{30}$값이 280~340 mL로 슬러지 침강성이 양호했지만 $S^{-2}$ 이온농도가 15 mg/L 이상에서는 $SV_{30}$가 560~680 mL로 슬러지 침강성이 악화되었다. 또한 $SCN^-$ 이온의 경우는 $SCN^-$ 이온의 농도가 300 mg/L 이하인 경우 $SV_{30}$값이 245~320 mL로 슬러지 침강성이 양호했지만, $SCN^-$ 이온농도가 400 mg/L 이상에서는 $SV_{30}$ 값이 470~567 mL로 슬러지 침강성이 악화되었다. 따라서 코크스공장 가스 정제공정에서 발생되는 폐수를 효율적이고 안정적으로 처리하고 미생물활성을 양호하게 유지하기 위해서는 폐수처리설비의 유입원수 중 $S^{-2}$와 $SCN^-$ 이온농도를 각각 15 mg/L, 400 mg/L 이하로 유지해주어야 바람직하다는 것을 알 수 있었다.

• 대한화학회지
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• 제33권2호
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• pp.208-214
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• 1989

구리(Ⅱ)와 코발트(Ⅱ)의 테트라 티오시안 착이온은 Amberlite LA 1, Alamine 336 또는 Aliquat 336과 같은 고분자량 알킬아민과 이온쌍 화합물이 형성되면 붉은색과 푸른색을 띠어 파장 480nm와 625nm에서 각각 최대 흡수 봉우리를 나타내므로 같은 조건에서 이들 이온쌍 화합물을 methyl isobutyl ketone으로 동시 추출하여 분광광도법으로 두 금속원소를 동시 정량하는 방법을 기술하였다. 그러나 각 흡수스펙트럼이 서로 조금씩 겹치기 때문에 흡광도로부터 농도를 구하기 위하여는 두개의 연립방정식이 필요했다. Fe(Ⅲ)와 Ni(Ⅱ)은 적은 양이 공존하더라도 구리 정량에 영향을 주었다. 이 동시정량법에 의해서 강철과 광물시료의 분석결과는 구리와 코발트 원소를 각각 분석한 결과와 잘 일치하였다.