• Hwankyungkyoyuk
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• v.2 no.1
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• pp.69-83
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• 1991

The management and disposal of harzardous chemicals from the middle school science class was studied for the safety of student and for the protection of the environment. This study was undertaken by analysis of 5 kinks of current middle school science text book and questionnaire survey, and reviewed on the recommended methods for the disposal of harzardous chemical wastes from science class. There are 237 chemicals determined in the middle school science text books and 87 among them actually used in middle school science laboratory. 51 chemicals are classified as harzardous ones and 49 highly hazardous according to the 'Law of Toxic Chemicals management'. 116 chemicals are defined as water pollutants and 10 are highly hazardous water pollutants according to the 'Water Quality Control Law' as well are 91 chemicals as air pollutants and 19 are highly hazardous air pollutants according to the 'Air Quality Control Law' Questionnaire survey results the identification of toxic chemicals, need for education, awareness of toxic effects and current problems in the management. Disposal of toxic chemicals in middle school science class has been undertaken without any treatment, which could be caused of environmental pollution. Most of science teacher wanted to have opportunities to attend supplement courses for the management and disposal of chemicals for the safety and environmental protection. Simple and applicable methods for the management and disposal of chemicals at middle school science level should be strongly recommended to be installed.

• Journal of the Society of Disaster Information
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• v.9 no.2
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• pp.123-127
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• 2013

Chemicals only likely illegally, depending on the user's intention can be used for malicious purposes. In addition, these chemicals are chemicals, and readily available for purchase on, through a simple mixing ratio to home made bomb manufacturing can be. In this study, to illegally division the list of chemicals and the chemical when handling the regulatory status and distribution system, identify and propose effective management plan prepared. Presented by foreign chemicals management, including a list of relevant laws and illegal sales activities on the Internet the eradication measures were collected, and chemical substance management system improvement and response system (proposition) for material to be used as maintenance is expected.

• Proceedings of the KSME Conference
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• 2007.05b
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• pp.3128-3133
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• 2007

The mixing method of water and chemicals is significant in a small-scale water supply system because drinking water should be supplied with a certain quantity of remaining chemicals maintained. In the present study, the concentration distribution and the mixing index were obtained from four models, which were to find out the optimal mixing method of water and chemicals. The two models brought the good mixing effects out of the four, one for providing chemicals from the center of water supply pipe and the other for setting up the semicircle block at the downstream of the chemicals-providing pipe. As a result, the mixing effect was found out to be increased due to the diffusion and the disturbance of flows. In conclusion, these results are expected to contribute to designing the optimal mixing system.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.36 no.4 s.107
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• pp.41-48
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• 2004

To make a basepaper for multipurposed seed paper, old news print (ONP) and mixed office waste paper (MOW), modified and unmodified with a commercial cellulase, were investigated. Each handsheet was applied with different chemicals such as insecticides, germicides and herbicides. The interactions behaviors of chemicals used with base papers were evaluated by means of the contents of chemicals impregnation and dissolving behaviors in water and soil. The ONP and MOW treated with the cellulase had higher impregnation and dissolving capacities in both water and soil than untreated ONP and MOW. However, the modified ONP showed lower impregnation and dissolving capacities compared to the modified MOW. The content of impregnation of chemicals would be affected with the degree of microfibrils produced by the modification treatment. Otherwise, dissolving capacities of chemicals depend on the affinity of the residual lignin in the paper.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.24 no.4
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• pp.587-612
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• 2014

Objectives: There is requirement to select candidate materials for chronic inhalation/carcinogenicity testing, so we would like to set the priority of candidate materials. Methods and Results: We recommend the priorities for candidate materials based on the chemicals stipulated in the Occupational Safety and Health Act(OSHAct) and the Toxic Chemicals Control Act(TCCA) in Korea. Conclusions: We presented candidate chemicals consisting of solids(powders), gases and liquids(Such as organic solvents) with priorities.

• Bulletin of the Korean Chemical Society
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• v.31 no.7
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• pp.1827-1828
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• 2010

• Environmental Mutagens and Carcinogens
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• v.21 no.1
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• pp.57-62
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• 2001

Bacterial reverse mutation assays were performed for 20 workplace chemicals in Korea, which were selected among workplace chemicals under the Korea Industrial Safety and Health Act (KISHA) with the occupational exposure levels (OELs). The assays were carried out by using the pre-incubation method ($37 ^{\circ}C$, 20 min) with and without metabolic activation using Salmonella typhimurium TA98, TA100, TA1535, TA1537 and E. coli WP2uvrA. The chemicals were tested at 5 concentrations both in the preliminary and the second assays. Despite the cell toxicities, there were no chemical-induced mutagenicities with or without metabolic activation in any of 20 chemicals.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.11c
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• pp.811-818
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• 2000

Agricultural chemicals spraying is one of the most efficient methods for pesticides control. General farming groups use Speed Sprayer but its deposition amount on practical crops is only 20% of total amount in SS case. Agricultural chemicals which fail to arrive the crops not only cause environmental contamination but loss of agriculture chemicals by lower deposition efficiency. For the purpose of improvement of these problems, this experiment proposes SS attachment type electrostatic induction spraying apparatus with DC power which improves deposition efficiency of agriculture chemicals on the crops.

• Journal of Korean Society of Water and Wastewater
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• v.19 no.1
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• pp.98-105
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• 2005

The effects of chlorination on the elimination of three estrogenic chemicals such as $17{\beta}$-estradiol (E2), nonylphenol (NP) and bis-phenol A (BPA) were investigated using yeast two-hybrid assay (YTA), estrogen receptor competition assay (ER-CA), and high-performance liquid chromatography/mass spectrometer (LC/MS). Results of YTA, ECA and the analysis of LC/MS indicated that the estrogenic activity of above mentioned three endocrine disruptors were significantly reduced as the result of chlorination. The decrease in estrogenic activity paralleled with decrease in estrogenic chemicals under the influence of free chlorine. One common characteristic of estrogenic chemicals is the presence of a phenolic ring. Considering that a phenolic ring is likely to undergo some sort of transformation in aqueous chlorination solution, the above mentioned results may be applied to the rest of the other estrogenic chemicals in natural waters.

• Toxicological Research
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• v.17
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• pp.313-317
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• 2001

The Ministry of Health and Welfare of Japan has set up six research groups concerning the endocrine disrupting chemicals. One of these projects was "A study on development of testing methodology for health effects due to exposure of environmental endocrine disruptors". In this paper, three topics are described. In OECD collaboration for pre-validation of uterotrophic assay, the most sensitive response to ethnyl estradiol was noted in the ovarectomized rats treated subcutaneously for 7 days. Secondly, it was suggested that changes of the serum $\alpha_{2u}$-globulin level may be a sensitive parameter for detecting the estrogenic activities of chemicals. Finally, development of the sexually dimorphic nucleus of preoptic area in the brain oj male rats was inhibited by the treatment with estrogenic chemicals, and their masculine behaviors and reproductive abilities were impaired after sexual maturation. In conclusion, these parameters are considered to be sensitive endpoints for testing estrogenic chemicals.chemicals.