• 한국수산과학회지
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• 제57권4호
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• pp.327-335
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• 2024

A simultaneous analytical method was developed to quantify antifouling agents and triazine herbicides in seawater using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The target compounds included diuron, irgarol 1051, and prometryn, which are prevalent in marine environments owing to their extensive use in antifouling coatings and agriculture. The analytical procedure involves solid-phase extraction (SPE) using HLB cartridges followed by LC-MS/MS analysis for precise quantification. The method exhibits high recovery rates for diuron (101% ± 1.25), irgarol 1051 (94.7% ± 2.08), and prometryn (93.7% ± 3.06). Seawater samples from 30 coastal sites in Korea were analyzed. Irgarol 1051 was not detected, whereas diuron was consistently detected across all sites, with concentrations from 0.68 to 11.3 ng/L, and prometryn was present at levels between 0.12 and 7.06 ng/L. The highest diuron and prometryn concentrations were recorded along the southeastern and western coasts, respectively. These findings underscore the critical need for continuous monitoring and regulations to manage these contaminants in marine ecosystems, thereby safeguarding ecological integrity and public health. This study establishes a robust analytical framework for the comprehensive assessment of multiple marine contaminants.

• 공업화학
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• 제19권2호
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• pp.222-227
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• 2008

본 연구에서는 광학센서의 응용을 위해 소수성 졸-겔로 개질된 고분자 막의 미생물 비점착 특성과 광학특성을 조사하였다. DiMe-DMOS (Dimethoxy-dimethylsilane)와 TMOS (Tetramethyl-orthosilicate)를 이용하여 제조한 소수성 졸-겔로 코팅된 컨퍼컬디쉬 표면과 유리표면에 E. coli JM109, B. cereus 318 그리고 P. pastoris X-33을 배양하였다. 배양 후, 부유세포를 증류수를 이용하여 제거하고 그람 염색법에 의해서 점착된 미생물을 염색하였다. 점착된 미생물의 수는 SEM을 이용하여 정량적으로 분석하였다. 유리표면에는 $2{\sim}3{\times}10^4$개/$mm^2$의 미생물이 점착되었으나 소수성 졸-겔 표면에는 200~300개/$mm^2$의 미생물이 점착됨으로써 소수성 졸-겔의 비점착 효과를 알 수 있었다. 또한, 소수성 졸-겔과 절광물질인 흑연을 혼합하여 제조한 절광층(Light insulating layer)을 pH나 용존산소 검출막 위에 재코팅한 후, pH나 용존산소의 검출막의 성능이 향상되었음을 알 수 있었다.

• 공업화학
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• 제30권3호
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• pp.358-364
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• 2019

반사 방지(anti-reflective; AR) 코팅막의 광학 특성 및 내오염성을 향상하기 위하여 tetraethylorthosilicate (TEOS)/염기 및 methyltrimethoxysilane (MTMS)/산 혼성 용액의 혼합비를 변화시키며 다양한 AR 코팅막을 제조하였다. 제조된 AR 코팅막은 UV-Vis, 접촉각 측정기, AFM, FT-IR 및 연필 경도 시험을 통해 특성을 분석하였다. MTMS/산 용액의 함량이 10 wt%인 혼성 용액으로 제조한 AR 코팅막에서 유리 기판은 매우 우수한 광학 특성(97.2%의 투과율), 우수한 내오염성($121^{\circ}$의 물 접촉각 및 $90^{\circ}$의 $CH_2I_2$ 접촉각), 중간 정도의 기계적 강도(4 H의 연필 경도)를 나타내었다. 특히 우수한 내오염성은 기판의 표면 위에서 혼성 용액 내 소량의 MTMS/산 용액으로부터 유래된 메틸기($-CH_3$)의 고른 분산에 기인한 것으로 고려되었다. 연필 경도 시험 결과로부터, AR 코팅막의 기계적 강도는 MTMS/산 용액의 함량이 증가할수록 향상되는 것으로 나타났다.

• 한국양식학회:학술대회논문집
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• 한국양식학회 2004년도 수산관련학회 공동학술대회 발표요지집
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• pp.154-155
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• 2004

• 한국양식학회:학술대회논문집
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• 한국양식학회 2004년도 수산관련학회 공동학술대회 발표요지집
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• pp.152-153
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• 2004

• Membrane and Water Treatment
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• 제11권2호
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• pp.159-166
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• 2020

In this study, the performance and antifouling properties of polysulfone (PSf) and polyvinylidene fluoride/polyvinylpyrrolidone (PVDF/PVP) membranes in a membrane bioreactor (MBR) were investigated. The membranes were prepared via phase inversion method, and then characterized by a set of analyses including contact angle, porosity and water flux and applied in a lab-scale MBR system. Soluble microbial product (SMP), extracellular polymeric substance (EPS), FTIR, gel permission chromatography (GPC) and particle size distribution (PSD) analyses were also carried out for MBR system. The results showed that the MBR with PSf membrane had higher hydrophobic organic compounds which resulted in formation of larger flocs in MBR. However, in this MBR had high compressibility coefficient of cake layer was higher (n=0.91) compared to MBR with PVDF/PVP membrane (n=0.8); hence, the fouling was more profound. GPC analysis revealed that compounds with molecular weight lower than 2 kDa are more formed on PSf membrane more than PVDF/PVP membrane. The results of FTIR analysis confirmed the presence of polysaccharide and protein compounds on the cake layer of both membranes which was in good agreement with EPS analysis. In addition, the results showed that their concentration was higher for the cake on PSf membrane.

• Membrane and Water Treatment
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• 제8권6호
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• pp.613-623
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• 2017

We report the novel thin film composite RO membrane modified by graphene oxide. The thin film composite RO membrane was exposed to 2000 mg/l sodium hypochloride; thereafter it was subjected to different graphene oxide concentration ranging from 50 mg/l to 1000 mg/l in water. The resultant membrane was crosslinked with 5000 mg/l N-hydroxysuccinimide. The performance of different membranes were analysed by solute rejection and water-flux measurement. It was found that 100 mg/l graphene oxide exposure followed by 5000 mg/l N-hydroxysuccinimide treatment resulted in the membrane with the highest solute rejection of 97.78% and water-flux of 4.64 Liter per sqm per hour per bar g. The membranes were characterized by contact angle for hydrophilicity, scanning electron micrographs for surface morphology, energy dispersive X-Ray for chemical composition of the surface, Atomic force microscope for surface roughness, ATR-FTIR for chemical structure identification. It was found that the graphene oxide modified membrane increases the salt rejection performance after exposure to high-fouling water containing albumin. Highly hydrophilic, antifouling surface formation with the nanomaterial led to the improved membrane performance. Moreover, the protocol of incorporating nanomaterial by this post-treatment is simple and can be applied to any RO membrane after it is manufactured.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2002년도 추계공동학술대회논문집
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• pp.39-44
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• 2002

이 논문에서는 IMO-MEPC AFS 협약 채택(2001년 10월 5일)에 대한 국내 업게의 동향을 조사·분석하고 이를 바탕으로 AFS 협약과 연계된 국내법 마련(해양환경관리법 입법 방향, 선박안전법의 개정안)과 아울러 국제방오시스템증서 발급 방안, 효과적인 유해방오시스템 규제 방안(항만국 통제의 방안)을 제시하며, AFS 협약의 효율적 관리를 위한 관련부서의 일원화 방안 등을 마련하였다.

• 한국미생물·생명공학회지
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• 제49권3호
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• pp.356-366
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• 2021

Two marine actinobacterial isolates, RG3 and RG8, were identified using 16Sr DNA as Streptomyces althioticus RG3 and Streptomyces californicus RG8 and submitted to the database of genetic information with accession numbers MW661230 and MW661234, respectively; they were found to have emulsification indexes of 60 ± 2.5% and 53 ± 2.2%, respectively. The biosurfactants obtained were stable at a temperature of 35℃ for both strains; they were stable at 10% NaCl, in the case of S. althioticus RG3 and at 10-15% NaCl in the case of Str.californicus RG8; both strains produced the most biosurfactant when exposed to alkaline conditions. We characterized the biosurfactants, including features such as their chemical composition, using Fourier transform infrared spectroscopy analysis. The antimicrobial activity of the biosurfactant extracts was evaluated using the well diffusion method against Vibrio alginolyticus MK170250, Escherichia coli ATCC 8739, Pseudomonas aeruginosa ATCC 4027, and Staphylococcus aureus ATCC 25923. S. althioticus RG3 biosurfactants were found to have better antimicrobial activity than those of Str. californicus RG8, indicating that they may be used in pharmaceutical industries and in the manufacture of antifouling products.

• 멤브레인
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• 제30권6호
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• pp.359-372
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• 2020

기름/물 분리막은 다른 분리 기술들에 비해 낮은 에너지 비용과 높은 성능 수준을 갖고 있다. 초친수성과 수중에서 소유성은 효과적인 기름/물 분리막을 개발하는 데 가장 중요한 요인으로 작용한다. 이와 더불어 방오속성과 생분해성도 효과적인 기름/물 분리막을 개발할 때에 고려되는 중요한 요소들이다. 본 리뷰 논문에서는 다양한 화학성분과 형태를 변형시켜 개발된 기름/물 분리막의 특성과 분리 효율을 개선한 연구들을 소개한다.