• 대한화학회지
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• 제30권2호
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• pp.201-206
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• 1986

새로운 분석시약 N-benzylisonitrosoacetylacetone imine (H-IAA-N-Bz)을 합성하여 원소분석, 적외선흡수스펙트럼, 핵자기공명흡수스펙트럼, 질량스펙트럼 등으로 그 구조를 확인하였다. H-IAA-N-Bz은 알카리 용액(pH = 7.0∼10.0)에서 구리착물을 형성하며, 클로로포름 유기용매층으로 잘 추출된다. 이 구리착물에 대한 분광광도법적 연구의 여러가지의 최적조건은 420nm의 파장에서 구하였으며, 클로로포름 10ml당 구리 $\mu$g이하의 농도 범위에서 Beer법칙이 잘 성립되었다. 구리 착물의 조성은 $Cu(IAA-N-Bz)_2$이며, 착물의 총괄 안정도상수는 $8.55{\times}10^6$이며, 몰흡광계수 $\varepsilon$은 3500l/$cm{\cdot}mol$이다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.860-863
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• 2003

산소포화도 측정은 Beer-Lambert's law를 기초로하여 측정 부위(손가락, 귀 등)에 LED를 발광한 후 투과된 적생광과 적외선광 신호가 통과하고 photodetector에서 감지한 후 나타난 두 광의 비율로 계산한다. Pulse oximetry는 이러한 산소포화도를 측정하는 기기인데, 근데 아주 민감하기 때문에 압력이 적절한 조직 혈류로 공급하기 어려울 정도로 아주 낮을 때 펄스를 검출한다. 다시말해서, SpO2는 혈관 수축이나 저혈압에서의 흐르지 않는 동맥혈의 펄싱의 손가락에 의한 O2소모 때문에 감소할 수도 있다. 이러한 점에서 측정 결과시의 한계가 있다. 따라서 본 논문은 SpO2를 측정할 때 어떠한 움직에 의해 나타나는 motion artifact를 최소화하는 알고리즘을 고찰하였다.

• 대한화학회지
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• 제33권3호
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• pp.304-308
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• 1989

Methyl Thymol Blue(MTB) 발색시약을 사용하여 $Lu^{3+},\;Eu^{3+},\;Sm^{3+}$ 및 $Pr^{3+}$ 원소의 흡수분광광도법에 의한 정량법을 확립하였다. ligand와 금속의 몰비는 1:1이었으며 Hexamethylenetetramine 완충용액으로 pH 6.5로 만들었을 때 MTB의 최대흡수파장은 440 nm이며 희토류-MTB 착물의 최대흡수파장은 610 nm로 나타났고 용액의 흡광도는 발색 후 7시간 정도까지 일정한 흡광도를 나타내며 $0{\sim}110{\mu}g/50ml$의 범위에서 Beer의 법칙에 따른다. phosphate, EDTA, citrate같은 리간드이온들은 희토류 -MTB의 흡광도에 크게 영향을 주며 각각의 희토류 원소분석의 선택성은 없다. 메틸알코올, 에틸알코올 및 아세톤 용매에서도 희토류-MTB 용액의 흡광도는 변하지 않았다. 몰흡광계수는 $1.2{\sim}2.0{\times}10^4mol^{-1}{\cdot}l{\cdot}cm^{-1}$이다.

• 분석과학
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• 제7권4호
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• pp.455-460
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• 1994

새로운 합성 시약 nocotinaldehyde-4-phenyl-3-thiosemicarbazone(NPS)을 이용하여 Hg(II)의 추출 흡광광도 정량법을 검토하여 미량 Hg(II)의 최적 정량조건을 확립하였다. Hg(II)-NPS 착물은 pH가 3.0~10까지 넓은 범위에서 선택성을 가진 안정된 착물을 형성하며, chloroform을 추출용매로 사용하여 365nm에서 측정한 몰흡광계수는 $2.45{\times}10^4L\;mol^{-1}\;cm^{-1}$이며, Hg(II)의 농도가 $0.2{\sim}18{\mu}g\;mL^{-1}$까지 Beer의 법칙을 만족하였다. 또한 본 분석법을 이용하여 두발(표준시료) 중의 수은을 분석하여 양호한 결과를 얻었다.

• Bulletin of the Korean Chemical Society
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• 제25권2호
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• pp.263-266
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• 2004

A sensitive, selective and rapid method has been developed for the determination ${\mu}$g/L level of vanadium ion based on the rapid reaction of vanadium(V) with 2-(2-quinolylazo)-5-diethylaminophenol (QADEAP) and the solid phase extraction of the colored chelate with $C_{18}$ cartridge. The QADEAP reacts with V(V) in the presence of citric acid-sodium hydroxide buffer solution (pH = 3.5) and cetyl trimethylammonium bromide (CTMAB) medium to form a violet chelate of a molar ratio 1 : 2 (V(V) to QADEAP). This chelate was enriched by solid phase extraction with $C_{18}$cartridge and the enrichment factor of 50 was obtained by elution of the chelates from the cartridge with ethanol. The molar absorptivity of the chelate is $1.28 {\times}10^5L\;mol^{-1}cm^{-1}$ at 590 nm in the measured solution. Beer's law is obeyed in the range of 0.01-0.6 ${\mu}$g/mL. The detection limit is 0.04 ${\mu}$g/L in the original samples. This method was applied to the determination of vanadium(V) in water and biological samples with good results.

• 약학회지
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• 제28권2호
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• pp.61-67
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• 1984

A method is described for the spectrophotometric determination of platinum (IV) with 2-oximino-1-indanone based on solvent extraction of Pt:2-oximino-1-indanone complex. The 2-oximino-1-indanone reacted with Pt(IV) to form a dark-orange complex which shows a characterisic maximum absorption at 342nm. The optimum PH for the platinum extraction lies between 5.4~8.0. Beer's law obeys up to 0.98-16.3ppm of platinum (IV) and the molar absorption coefficient is $1.06{\times}10^{-4}L.mol^{-1}.cm^{-1}$. The relative standard deviation of the method was $\times2.1%$. The composition of the complex is estimated to be Pt : In= 1 : 1, by the mole ratio method and ion exchange resin experiment. The optimum condition for the determination of platinum has been studied in detail. The 2-oximin-1-indanone is found to be a selectivereagent for the determination of platinum, since the synthesixed 2-oximino-1-indanone did not react with other metals such as cobalt, cadmium, copper, manganese nickel, iron, lead and zinc, to form the complex. In this studies, we have also clarified Sindhwani and Singh's spectrophotometric determination data of various metals with acenaphthenequinone monooxime (Talanta 20,248, 1973), whose results were not correct.

• Journal of Industrial and Engineering Chemistry
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• 제67권
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• pp.461-468
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• 2018

A highly sensitive, selective and rapid method for the determination of lead based on the reaction of lead (II) with 5-(4'-chlorophenylazo)-6-hydroxypyrimidine-2,4-dione (CPAHPD) and the solid phase extraction of the Pb(II)-CPAHPD complex with Amberlite XAD-2000 was developed, in the presence of pH 5.6 buffer solution and Triton X-114 medium. CPAHPD reacts with lead to form a violet complex with a molar ratio of 2:1 (CPAHPD to lead). This complex was enriched by the solid phase extraction with Amberlite XAD-2000. An enrichment factor of 500 was obtained by elution of the complex from the resin with a minimal amount of isopentyl alcohol(0.2 mL). In isopentyl alcohol medium,the molar absorptivity of the complex is $1.13{\times}10^6L\;mol^{-1}cm^{-1}$ at 647 nm. Beer's law is obeyed in the range of $5.0-160ng\;mL^{-1}$ in the measured solution. The relative standard deviation for 10 replicate samples of $50ng\;mL^{-1}$ level is 1.26%. The detection and quantification limits reaches 1.5 and $4.7ng\;mL^{-1}$ in the original samples. The presented procedure was successfully applied for determination of lead content in real samples such as vegetables, waters, biological and soil samples with satisfactory results.

• Bulletin of the Korean Chemical Society
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• 제25권4호
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• pp.545-548
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• 2004

A sensitive, selective and rapid method for the determination of nickel based on the rapid reaction of nickel(II) with QADMAA and the solid phase extraction of the Ni(II)-QADMAA chelate with $C_{18}$ membrane disks has been developed. In the presence of pH 6.0 buffer solution and sodium dodecyl sulfonate (SDS) medium, QADMAA reacts with nickel to form a violet complex of a molar ratio of 1 : 2 (nickel to QADMAA). This chelate was enriched by solid phase extraction with $C_{18}$ membrane disks. An enrichment factor of 50 was obtained by elution of the chelates form the disks with the minimal amount of isopentyl alcohol. The molar absorptivity of the chelate was $1.32{\times}10^5L\;mol^{-1}cm^{- 1}$ at 590 nm in the measured solution. Beer's law was obeyed in the range of 0.01-0.6 ${\mu}$g/mL. This method was applied to the determination of nickel in water and biological samples with good results.

• Bulletin of the Korean Chemical Society
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• 제25권4호
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• pp.549-552
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• 2004

A sensitive, selective and rapid method has been developed for the determination of mercury based on the rapid reaction of mercury(II) with p-sulfobenzylidenethiorhodanine (SBDTR) and the solid phase extraction of the colored chelate with $C_{18}$ disks. In the presence of pH 3.5 sodium acetate-acetic acid buffer solution and Emulsifier-OP medium, SBDTR reacts with mercury(II) to form a red chelate of a molar ratio 1 : 2 (mercury to SBDTR). This chelate was prconcentrated by solid phase extraction with $C_{18}$ disks. An enrichment factor of 50 was achieved. The molar absorptivity of the chelate is $1.28{\times}10^5 L{\cdot}mol^{-1}{\cdot}cm^{-1}$ at 545 nm in measured solution. Beer's law is obeyed in the range of 0.01-3 ${\mu}$g/mL. The relative standard deviation for eleven replicates sample of 0.01 ${\mu}$g/mL is 1.65%. This method was applied to the determination of mercury in tobacco and tobacco additive with good results.

• Bulletin of the Korean Chemical Society
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• 제32권5호
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• pp.1564-1568
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• 2011

A solvent extraction separation, preconcentration and determination of thorium with a new crown, 2-ethyl-N-benzyl-4,7,10,13,16-pentaoxa-1-azacyclooctadecane (MACE), is described in the study. The amount of thorium in the aqueous phase and organic phase was determined by Inductively Coupled Plasma-Optical Emission Spectroscopy and Ultraviolet-Visible, respectively. Thorium loaded organic phase was quantitatively stripped in a stage by using 1.0 M $HNO_3$. Thorium was effectively extracted with MACE in the pH range of 6-7 to produce a 3:2 complex ratio in the chloroform. A highly sensitive and rapid spectrophotometric method was described for determination of trace amounts of thorium with MACE. The effective molar absorption coefficient at 281 nm is $1.98{\times}10^3\;mol^{-1}cm^{-1}$, and the system complies with Beer's law in the range from 0.464 to 2.32 ${\mu}gm\;L^{-1}$ of thorium. Thorium was also determined in standard and environmental samples.