• Proceedings of the Membrane Society of Korea Conference
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• 1993.10a
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• pp.54-55
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• 1993

유기염소계 화합물들은 저렴한 가격과 우수한 세정력으로 기계, 금속, 섬유산업에서 뿐만아니라 일반적인 용제로도 널리 사용되고 있다. 그러나, 현재 산업현장에서사용 후 처리에 있어 유기염소계 화합물들을 완전히 제거하지 못하고 방출하는 실정이다. 또한, 음용수제조시 행해지는 염소소득으로 미량의 트리할로메탄(THM)인 클로로포름이 생성된다. 이러한 유기염소계 화합물들은 음용수 중에 포함되어 체내로 흡수되면 암을 유발시킨다. 따라서 물중에 용해된 미량의 유기염소계 화합물들을 제거하는 것이 필수불가결한 실정이다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1747-1748
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• 2008

정수처리시스템에서의 염소소독공정은 염소투입설비의 지연요소와 염소반응시간에 의한 지연요소 등으로 매우 큰 시지연특성을 갖는 대표적인 공정이다. 본 논문에서는 염소소독공정 중 후염소공정을 조사 분석하여 공정에 영향이 큰 파라메타를 선정하고 이를 통하여 각 파라메타간 상관관계를 분석함으로써, 시지연공정의 모델을 개발하였다.

• Journal of Bio-Environment Control
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• v.28 no.2
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• pp.166-171
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• 2019

This study was conducted to investigate the effect of gaseous chlorine dioxide ($ClO_2$) concentration and treatment method for maintaining marketability in strawberries 'Maehyang' for export. After harvesting strawberry colored with $60{\pm}5%$ of the skin, and the gaseous $ClO_2$ was applied as four treatments in the cold store set with $10^{\circ}C$ which were as follows: i) non-treatment (Control), ii) $0.2mg{\cdot}L^{-1}$ for 30 minutes, iii) $0.4mg{\cdot}L^{-1}$ for 30 minutes, and iv) continuously exposed at $0.4mg{\cdot}L^{-1}$ during the storage period. Weight loss, firmness, soluble solids content, color, incidence of gray mold, and quality grade of strawberries were investigated every 3 days during 16 days storage in cold store. The weight loss was consistently high at $0.2mg{\cdot}L^{-1}\;ClO_2$ treatment, and the weight loss was lower than other treatments when gaseous $ClO_2$ was continuously treated. Firmness was significantly higher at 0.2 and $0.4mg{\cdot}L^{-1}$ $ClO_2$ treatment on the 13th day of storage. Soluble solids content tended to below in continuous gaseous $ClO_2$ treatment. The colors showed no tendency as affected by concentrations and treatment methods of gaseous $ClO_2$. No gray mold was observed in the continuous gaseous $ClO_2$ treatment until the 13th day of storage. The quality grade was lower in gaseous $ClO_2$ treatment group than in the control. As a result, it was possible to decrease the weight loss and the incidence of gray mold by continuously treating the gaseous $ClO_2$ to strawberry 'Maehyang' for export during the storage period after harvest. However, further research is needed on method to maintain quality grades of fruits.

• Applied Biological Chemistry
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• v.32 no.4
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• pp.327-331
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• 1989

In this study the Theological properties between C1-treated soft wheat flour and untreated soft wheat flour was determined. Chlorine treatment lowered pH of the flour in a linear fashion. Water absorption and dough stability was high in proportion to the increase of treatment level but mechanical tolerance index was reduced by each increment of chlorine. The valorimeter value did not exhibit reproducible trend on treatment of chlorine. In general, resistance(BU), resistance to extension and maximum viscosity(BU) were highest in control group; lowest in 1 oz./cwt. flour and tended to rise in 2 oz./cwt. flour when it fermented in chamber for 90 min and 135 min. The maximum viscosity was highest (1,160BU) in 4 oz./cwt. flour and temperature at maximum viscosity tended to rise gradually in proportion to the increase of treated level.

• Journal of Conservation Science
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• v.26 no.4
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• pp.397-406
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• 2010

The most ideal method to measure the water-soluble $Cl^-$ ion eluted from iron artifacts is conducting the analysis on desalting solution by Ion Chromatography. But most institutes related to cultural heritages use Cl meter by reason of lack of budget and experts. This study evaluated reliability and stability between Cl meter and Ion Chromatography by doing cross-validation with results from two methods to detect $Cl^-$ ion of desalting solution. From D.I water, extremely small quantities of $Cl^-$ ion was detected by the influence of remaining water-soluble $Cl^-$ ion at the electrode of Cl meter and water-soluble $Cl^-$ which remains in Sodium sesquicarbonate, components of reagent was detected as well. The first desalting solution had the most $Cl^-$ ions, $Cl^-$ ion slightly decreased from the second to the fourth desalting solution and tend to decrease again at the stage of dealkalified in D.I water. Each Cl meter has the standard deviation according to the measured numbers and the higher concentration of $Cl^-$ ion the desalting solution has, the wider the deviation is. But when the concentration of $Cl^-$ ion is low, it was stable to use Cl meter to detect the concentration of $Cl^-$ ion from iron artifacts because there is the small deviation, It is thought that conductivity meter method is not suitable for measuring $Cl^-$ ion, because the electrical conductivity of alkaline solution is too high to measure $Cl^-$ ion.

• Journal of Plant Biology
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• v.37 no.2
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• pp.223-229
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• 1994

장미(Rosa sp. cv. Paul's Scarlet)와 밀(Triticum aestivum L.)의 조직 배양체에서 polychlorinated biphenyl(PCB)의 대사를 조사하였다. 조사된 PCB는 2개에서 6개까지의 치환 염소를 보유한 19종류였다. PCB를 투여하여 96시간 동안 배양시킨 결과 장미에서는 9종, 밀에서는 5종류가 30% 이상의 대사율을 나타내었다. 대사율이 높은 PCB들은 모두 2번 위치에 치환 염소를 갖는다는 공통점이 있으며, 대사율이 낮은 PCB일수록 평면적 구조를 갖는 것으로 나타났다. 한편 밀의 배양세포는 para- 위치에 치환 염소를 갖는 PCB에 대한 대사 활성이 전혀 없었다. 두 종의 배양 세포 모두에서 phenobarbital을 처리한 경우 non-p-chlorinated biphenyl의 대사율만이 증가하였으며, parachlorinated biphenyl의 대사 활성은 phenobarbital 처리에 영향을 받지 않았다. 또한 phenobarbital의 처리에 의하여 cinnamate-4-hydroxylase의 활성이 140% 이상 증가하였다. 이상의 결과는 식물체에서의 PCB 대사가 그 구조에 의해 결정될 수 있으며, 특히 para- 위치의 치환 염소를 보유한 종류와 그렇지 않은 종류는 별개의 cytochrome p450의 동위 효소에 의하여 대사될 수 있음을 보여주고 있다.

• Environmental engineer
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• s.179
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• pp.72-76
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• 2001

본 연구의 목적은 기존 혼합도금폐수 처리공정의 문제점(현재 도금폐수처리시 사용되고 있는 알칼리 염소법은 작업장내의 기기 부식, 작업환경 열악, 배출수 내의 활성염소 잔류 및 폐수처리 공정의 적정화 미흡)을 해결하고 폐수처리 공정에서 유해 물질을 즉시 분석할 수 있는 정량제를 국산화하여 국내의 도금폐수 처리공장에 보급하는 것이다. 개발한 기술은 기존 도금폐수 처리공정에서 사용하고 있는 과다한 차아염소산소다 사용법을 대체한 기술로 처리공정의 적용법이 간단하

• Korean journal of applied entomology
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• v.56 no.3
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• pp.253-259
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• 2017

Fumigation using chlorine dioxide ($ClO_2$) has been regarded as a potential control technique against stored grain insect pests. The control efficacy can be enhanced with increase of opening rates of spiracles by facilitating the toxic gas delivery to internal body. To test this hypothesis, this study used the Indianmeal moth, Plodia interpunctella, which was known to be susceptible to $ClO_2$, and analyzed the opening rate of spiracles. A total of 9 pairs of spiracles were observed in P. interpunctella larvae, in which one pair was located on the prothorax and eight pairs were on the abdomen. Within the body, the spiracles were connected to longitudinal and transverse tracheal trunks. The open spiracles were determined by the dye-infiltration method. Based on this method, the opening rate of spiracles increased up to about 60% with increase of ambient temperatures. Furthermore, exposure to carbon dioxide stimulated the opening rate of spiracles up to about 95%. In contrast, exposure to $ClO_2$ prevented the spiracle opening and resulted in only 25% of spiracles in an opening state. The addition of carbon dioxide to $ClO_2$ treatment rescued the opening rate of spiracles as much as the carbon dioxide single treatment. Based on this modulatory activity of carbon dioxide against spiracles, the combined treatment of $ClO_2$ with carbon dioxide resulted in significant increase of its toxicity against P. interpunctella compared to a single $ClO_2$ treatment.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.28 no.3
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• pp.223-229
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• 2022

This study was conducted to investigate the effect of packaging methods and sterilization treatment on storability and microbial control in paprika fruits. When treated with chlorine dioxide gas for 3, 6, and 12 hours and cold plasma gas for 1, 3, and 6 hours, and then packed in a carton box and stored in a 8 ± 1℃ chamber for 7 days, chlorine dioxide treated 12 hours and plasma treated 6 hours was prevented the development of E·coli and YM(yeast and mold). Accordingly, the control was treated with chlorine dioxide for 12 hours and plasma for 6 hours, packed using a carton box and 40,000 cc·m^-2·day^-1·atm^-1 OTR film (MAP), and stored in a 8 ± 1℃ chamber for 20 days. Fresh weight loss rate during storage was less than 1% in the MAP treatments, and the visual quality of the MAP treatments was above the marketability limit until the end of storage. There was no difference in the contents of oxygen, carbon dioxide, and ethylene in the film. In the case of firmness, the chlorine dioxide treatments was low, and the Hunter a^* value, which showed chromaticity, was highest in the Plasma 6h MAP treatment. Off-odor was investigated in the MAP treatments, but it was very low. The rate of mold growth on the fruit stalk of paprika was the fastest and highest in the chlorine dioxide treated box packaging treatments, and the lowest in the chlorine dioxide treated MAP treatments at the end of storage. The aerobic count in the pulp on the storage end date was the lowest in the plasma treated box packaging treatments, the lowest number of E·coli in the chlorine dioxide treated MAP treatments, and the lowest yeast & mold in the chlorine dioxide treated box packaging treatments. As a result, for the inhibition of microorganisms during paprika storage, it is considered appropriate to treat plasma for 6 hours before storage regardless of the packaging method.

• Journal of the Korean Wood Science and Technology
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• v.44 no.1
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• pp.147-155
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• 2016

Pulp made from sugarcane bagasse (SCB) was bleached in element chlorine free (ECF) sequence. The peroxide bleaching process for the final bleaching process has been introduced in order to reduce the use of chlorine dioxide. Prior to peroxide bleaching, different chelating chemicals were applied. When 4.5% of the total chlorine dioxide was used, bleached SCB pulp using additional DTPA chelate stage (DEDQP) resulted in 87.0% of the ISO brightness. However, bleached pulp using simultaneous stage of DTPA chelate and chlorine dioxide (DE(DQ)P) was reached at 83.9% of the ISO brightness. The viscosity of DEDQP bleached pulp was 25.6 cPs, and the one of DE(DQ)P bleached pulp was 21.9 cPs. Decreasing of chelate effect by chlorine dioxide led to a decrease in the final brightness and a lower viscosity. But simultaneous stage of EDTA chelate and chlorine dioxide (DE(DQ)P) led to higher final brightness (87.0% ISO) and higher viscosity (25.8 cPs) than those of the $DEDQ_{EDTA}P$ bleached pulp (86.4% ISO, 25.2 cPs).