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Ion Chromatograph에 의한 음료수중 Na^+, NH_4^+, K^+의 검출에 관한 연구
김형석,전준배,박양원 慶熙大學校 1987 論文集 Vol.16 No.-
We should drink 2-3L of the clean potable water per day to maintain our life in good condition. According to the population increase and industrialization, the water quality of the city drinking water have some problems, and the contamination of the ground water and surface water are threatening the water resources. In the analysis of the drinking water, U.S. Standard method and other several methods have been used. But recently the ion chromatography. Which could analyze anion and cation within few minutes, has developed and are using in water analysis in developed countries. Author tried to analyze monovalent cations by using single column ion chromatograph method with conductivity detector. The retention time of the Na, NH_4, and K ions are 2.62, 3.05, and 3.29 minutes under the condition of the Ion-200 Cation column(Interaction)with 10mM isonicotinic acid(pH 2.7) eluent. By using the 25ppm standard solution the relative standard deviation was within 5.0%
소음(騷音) Stress에 의한 요(尿)중 Catecholamine의 분비량(分泌量) 변화(變化)
김형석,전준배,Kim, Hyung-Suk,Chun, Joon-Bae,Lundberg, Ulf 대한예방의학회 1993 Journal of Preventive Medicine and Public Health Vol.26 No.4
Noise is not only affecting the ear and the auditory cortex locally, but its influence is widely spread throughout the brain structures, e. g., the reticular formation, the brain stem nuclei or the subcortical forebrain area. Hence, any of the organism's activities can be hindered or stimulated by noise. High noise is a stressor and the catecholamine level can be used both as a stress marker and as an indicator of modified sympathetic nervous system activity. Several recent studies have found that the urinary excretion of catecholamines is increased due to high noise intensity, especially unexpectedly high and long lasting noise. The present study was conducted in order to examine the effects of noise stress on urinary excretion of ctecholamines in rats and humans. Rats were exposed to 90 dB noise for 10, 30, and 60 minutes, 3 and 12 hours. 24 hour . urinary samples were collected and the catecholamones were extracted by alumina and analyzed by HPLC-ECD. Catecholamine levels increased with time of exposure up to 60 minutes : norepinephrine concentration at 60 min of noise=1.038 ng/ml, epinephrine=0.636 ng/ml. Urine catecholamines of blue collar workers exposed to 90 dB of noise at the work place were collected between 2 and 4 p.m. and compared to that of white collar workers exposed to 70 dB. Mean norepinephrine level of the blue collar workers was 0.89 ng/ml (${\pm}0.25$), epinephrine 0.24ng/m1 (${\pm}0.09$), and that of the white collar workers 0.48 ng/ml (${\pm}0.12$), epinephrine 0.19 ng/ml(${\pm}0.05$). It was concluded that noise acts as a stressor and increases the catecholamine levels in both rats and humans.