• 환경영향평가
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• 제24권2호
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• pp.154-162
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• 2015

작업환경중 톨루엔 농도와 뇨중 마뇨산 농도와의 상관성에 대하여 54개 사업장에서 일하는 124명의 근로자를 대상으로 연구하였다. 가장 높은 실내 작업장의 톨루엔 농도는 인쇄 공정에서 81.116ppm으로 측정되었으며, 기하평균농도는 12.304 ppm으로 높은 값을 나타내었다. 톨루엔 노출 작업자의 뇨중 마뇨산 농도의 기하평균은 0.714 g/g creatinine으로, 비노출군에 비하여 5배 정도 높게 나타났다. 인쇄 공정 노동자의 평균 뇨중 마뇨산 농도는 다른 공정의 노동자에 비해 가장 높은 1.145g/g creatinine 이었다. 작업자의 노출 톨루엔 농도와 뇨중 마뇨산 농도 사이의 상관계수는 r=0.624 (P<0.01)로 상관성이 비교적 높은 것으로 나타났으나, 뇨중 마뇨산 농도와 근로자의 성별, 음주 및 흡연, 근무경력 등의 상관성은 낮게 나타났다. 노출 톨루엔 농도 X에 대한 뇨중 마뇨산 농도 Y의 회귀방정식은 Y = 0.037X + 0.562로 표현할 수 있다. 결론적으로 작업장에서의 톨루엔 노출농도에 따라 뇨중 마뇨산농도가 유의하게 증가함을 알 수 있다.

• KIEAE Journal
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• 제16권6호
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• pp.115-122
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• 2016

Purpose: The study is to measure indoor air pollutants concentration of existing housing and to analyze the causes and assess in accordance with the government's criteria. The research result could be used as data for public health through indoor air quality management of existing housing and more as a reference for new housing. Method: It was investigated 24 middle class housings of metropolitan area in summer which have been built for the past 30 years. Concentration of HCHO, TVOC was investigated in living room at morning and night and concentration of $CO_2$ was investigated in living room and master bedroom at morning and night. SKT100-X5 was used for concentration of HCHO, TVOC and ZGm053UK for concentration of $CO_2$. Result: Average concentration of TVOC was 1.31 times more than that of HCHO and standard deviation of that was 1.73 times higher. Average concentration of $CO_2$ was almost nearly close to 1,000ppm being criteria of the Ministry of Environment.

• 한국산업보건학회지
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• 제23권4호
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• pp.323-332
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• 2013

Objectives: This study was conducted in order to investigate the diesel exhaust particle(DEP) concentrations in the thirteen parking lots of large shopping complex. Methods: The real-time black carbon(BC) concentration was determined using an Aethalometer, and elemental/organic carbon concentration was determined according to the method of the National Institute for Occupational Safety and Health(NIOSH) 5040. The particle number concentration(NC), lung deposited surface area concentration(LDSA) and geometric mean diameter(GMD) were determined using a DiSCmini aerosol monitor. Results: The average concentration of BC, EC, OC, NC, LDSA and GMD were $19.1{\mu}g/m^3$, $12.6{\mu}g/m^3$, $51.5{\mu}g/m^3$, $94,000particles/cm^{-3}$, $298{\mu}m^2/cm^{-3}$ and 57 nm in all parking lots, respectively, approximately 3-fold higher than those found in the urban outdoor. The average concentration of BC were $21.3{\mu}g/m^3$ in underground parking lots, 3-fold higher than above parking lots. Conclusions: Therefore, the parking lots at the large shopping complex can be considered a potentially dangerous environment with a high concentration of DEP nanoparticles.

• 생명과학회지
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• 제17권10호
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• pp.1414-1418
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• 2007

3가지 농도의 납을 첨가한 토양에서 생장한 애기장대(Arabidopsis thaliana)에서 식물체에 축적된 납의 농도를 조사하였다. 환경부 고시 오염물질 배출기준 농도(1 mg/l)와 10배 높은 농도(10 mg/l) 및 50배 높은 농도(50 mg/l)의 납이 첨가된 토양에서 생장한 식물의 줄기에 축적된 납의 농도는 3가지 농도에서 증가율이 유사하게 나타났으며, 정상식물 줄기에 비하여 평균 약 24% 증가하였다. 3가지 농도의 납이 첨가된 토양에서 생장한 식물의 잎에 축적된 납의 농도는 정상식물 잎에 비하여 평균 약 57% 증가하였으며, 줄기와 마찬가지로 토양에 첨가된 납의 농도 증가에 따라 잎에 축적된 납의 농도는 유의한 차이는 나타나지 않았으며 증가율도 유사하였다. 반면 오염물질 배출기준 농도와 10배 높은 농도의 납이 첨가된 토양에서 생장한 식물의 뿌리에 축적된 납의 농도는 정상식물 뿌리에 비하여 평균 약 114% 증가하였으나, 50배 높은 농도에서는 약 861% 증가하여 줄기나 잎과는 대조적인 결과를 나타내었다. 토양 속에 첨가된 납의 농도가 증가하면 애기장대 식물체 내에 축적된 납의 농도도 증가하였는데, 특히 오염물질 배출기준농도보다 50배 높은 납이 첨가된 토양에서 생장한 식물체내에 축적된 납 농도는 정상식물보다 약 2.6배 증가하였다. 이러한 결과는 토양 속에 오염된 납은 식물의 줄기나 잎보다는 뿌리에 더 많이 축적되며, 줄기와 잎에 축적되는 납 농도는 토양 속에 오염된 납 농도에 비례하여 증가하지 않으나 뿌리에서는 농도에 비례하여 매우 증가하였음을 나타내고 있다.

• 한국식품과학회지
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• 제25권5호
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• pp.552-557
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• 1993

대두 펩타이드의 아미노산 조성 및 평균소수도가 혈청 콜레스테롤의 농도에 미치는 영향을 조사하기 위하여, 대두 단백질(ISP), 카세인(CNP), 이들 단백질을 펩신으로 가수분해하여 pH에 다른 펩타이드 침전 획분들(SHT, SH8, SH6, SH4, CHT) 및 각 단백질과 같은 조성의 아미노산 혼합물(SAA, CAA)을 흰쥐에 섭취시키고 혈청콜레스테롤 농도를 측정하였다. 각 펩타이드의 아미노산 조성을 분석하고, 이로부터 구한 Lys/Arg 비율 및 소수성 아미노산의 몰분율은 혈청 콜레스테롤의 농도와 상관관계가 없었으며, Tanford, Manavalan 및 Meirovitch법으로 구한 평균소수도와도 상관관계가 없었다. 그러나, Krigbaum법으로 구한 평균소수도와는 상관계수가 -0.736으로 음의 상관관계이어서, 식이 펩타이드의 krigbaum 평균소수도가 높을 수록 래트의 혈청 콜레스테롤 농도가 낮아졌다.

• 대한환경공학회지
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• 제34권5호
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• pp.335-344
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• 2012

본 연구에서는 우리나라 대표적인 4대강 수계의 퇴적물을 대상으로 HCB와 DDTs 농도분포 특성에 대해 검토하였다. HCB 농도는 한강 0.41~3.80(평균 1.58) ng/g, 낙동강 0.08~6.09(평균 0.90) ng/g, 금강 0.02~0.97(평균 0.30) ng/g, 영산강 0.28~0.59(평균 0.42) ng/g, 섬진강 0.23~0.48(평균 0.32) ng/g 으로 검출되었다. DDTs 농도는 한강 0.67~14.20(평균 4.76) ng/g, 낙동강 N.D.~10.36(평균 1.81) ng/g, 금강 N.D.~7.26(평균 1.87) ng/g, 영산강 N.D.~3.12(평균 1.08) ng/g 및 섬진강에서 0.02~2.04(평균 0.56) ng/g으로 검출되었다. 우리나라 하천 퇴적물 중 HCB와 DDTs 농도는 다른 나라의 강이나 하구언 퇴적물 농도와 비교해도 상대적으로 낮게 나타났다. 퇴적물 시료에서 검출된 농도를 미국해양기상연구소가 제시한 퇴적물권고기준치와 비교한 결과 HCB의 농도는 모두 ERL 값에 크게 미치지 않는 것으로 조사되었다. DDTs의 경우 46개 시료에서 ERL(1.58 ng/g)을 초과하는 농도를 나타내어 현재 퇴적물 중 DDTs 농도가 저서생물에 위해한 영향을 줄 것으로 예상되는 수준은 아니나 지속적인 관찰이 요구되는 것으로 판단되었다.

• 한국산업보건학회지
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• 제25권1호
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• pp.72-81
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• 2015

Objectives: The aim of this study was to investigate the exposure and risk assessment of residents near asbestos mines in Korea. Methods: To assess asbestos types and airborne concentrations, air monitoring was performed in the neighborhoods of Kwangcheon (KC) and Sinsuk (SS) mines, which were leading South Korean mines in the past. In addition, activity-based-sampling (ABS) of residents' particular activities were conducted in order to estimate the Excess Lifetime Cancer Risks (ELCRs) for the residents. Conclusions: The average concentration of airborne asbestos in KC was 0.0014 f/cc and 0.0015 f/cc by PCM and TEM, respectively. In SS it was equal at 0.0012 f/cc by PCM and TEM. No statistically significant difference was found in the average concentration of airborne asbestos between the two mines. The average asbestos concentration of ABS was 0.0048 f/cc (PCM) and 0.0042 f/cc (TEM) in KC, while it was 0.0137 f/cc (PCM) and 0.0125 f/cc (TEM) in SS. It was found that the average asbestos concentration of ABS in SS was statistically significantly higher than that of KC (p<0.01). The results of ELCRs by scenario in KC showed that the scenarios of bicycle, car, weed control, weed whacking, child playing in the dirt, and physical training fell within $1{\times}0^{-6}-1{\times}10^{-4}$, which is the acceptable range of ELCR. The scenarios of motorcycle, walker, digging, and field sweeping, however, exceeded the acceptable range. In SS, only the scenario of car fell within the acceptable range, while all of the other scenarios exceeded the acceptable range.

• 한국가축번식학회지
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• 제21권4호
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• pp.405-409
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• 1997

This study was carried out to investigate the general characteristics such as semen volume, pH, sperm motility and sperm concentration of the semen collected from Korean Jindo dogs by the mothod of Digital manipulation of penis, and the effect of temperature and preservation time on motility of fresh semen. Multiple ejaculates were collected from four male Korean Jindo dogs. The results obtained in this experiment were as follows : 1. Average semen volume per ejaculate, semen pH, sperm motility and sperm concentration of the second fraction and the small volume of third fraction from the ejaculate were 3.29ml, 6.30, 96.70% and 1.64$\times$108 cells/ml, respectively. 2. Average semen volume per ejaculate, semen pH, sperm motility and sperm concentration of the first fraction from the ejaculate were 1.16ml, 6.10, 6.67% and 5.07$\times$105cells/ml. Average semen volume per ejaculate, semen pH, sperm motility and sperm concentration of the second fraction from the ejaculate were 2.30ml, 6.33, 97.66% and 1.92$\times$108cells/ml. Average semen volume per ejaculate, semen pH, sperm motility and sperm concentration of the third fraction from the ejaculate were 3.24ml, 6.51, 93.33% and 3.13$\times$107cells/ml. 3. Motility of fresh semen during preservation were higher at 17$^{\circ}C$ than at 5$^{\circ}C$ or 36$^{\circ}C$. When preservation temeprature was 17$^{\circ}C$, motility were 95.75% at 1 h, 90.00% at 6 h, 84.25% at 12 h, 68.00% at 18 h, 36.25% at 24 h and 28.75% at 30 h, respectively.

• 대한의생명과학회지
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• 제16권1호
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• pp.19-24
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• 2010

We analyzed and compared the concentration of total cholesterol (CHOL), high density lipoprotein (HDL) cholesterol, low density lipoprotein (LDL) cholesterol and triglyceride (TG) in serum and the serum protein electrophoresis fractions of thyroid disease patients. In comparison with the average of reference, our data showed that the average concentration of CHOL, LDL cholesterol and TG in hyperthyroidism patients were decreased significantly, but HDL cholesterol was increased significantly. In hypothyroidism patients, CHOL, HDL cholesterol, LDL cholesterol and TG were all increased significantly. In comparison of the concentration of lipids in each patient to reference range, 28.3% of hyperthyroidism patients showed abnormally low level of total cholesterol. In the patients with hypothyroidism, the percentage of patients showed abnormally high level of CHOL, HDL cholesterol, LDL cholesterol and TG were 37.7%, 10%, 68.8% and 49.1%, respectively. In our studies of serum protein electrophoresis, the average of ${\alpha}_2$-globulin and $\gamma$-globulin in hyperthyroidism patients were increased and $\beta$-globulin was decreased significantly. In hypothyroidism patients, the average of $\gamma$-globulin was increased and $\beta$-globulin was decreased significantly. In comparison of protein fractions of each patient to reference range, 38.3% and 50.0% of hyperthyroidism patients showed abnormally high levels of ${\alpha}_2$-globulin and $\gamma$-globulin, but 73.3% of patients showed abnormally low level of $\beta$-globulin. In hypothyroidism patients, 70.4% of patients were abnormally decreased in $\beta$-globulin and 63.9% of patients were abnormally increased in $\gamma$-globulin. These data suggest that the concentrations of CHOL, HDL cholesterol, LDL cholesterol and TG are not critical data for clinical interpretation of hyperthyroidism, but the levels of them are useful for interpretation of hypothyroidism patients. Our results of serum protein electrophoresis suggest that the concentration of serum protein electrophoresis fractions can be useful to understand the thyroid disease.

• 한국대기환경학회지
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• 제25권6호
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• pp.571-578
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• 2009

$PM_{2.5}$ black carbon (BC) concentrations were measured to investigate the filter spot loading effect in raw BC data at 5-minute time-based resolution using a single-wavelength aethalometer at a Gwangju site. Also the elemental carbon (EC) concentrations from 24-hr integrated filter-based measurements of $PM_{2.5}$ particles were determined to compare with the loading compensated BC values. Close examination of the time-series BC data showed clearly the "gaps" when the filter tape advances, suggesting the correction of raw BC data. Therefore, we calculated the average BC concentration in each range of attenuation (ATN) to decide if there was (or was not) an effect on the aethalometer data according to the loading of the filter spot. A consistent decrease of average BC concentration was found with increasing ATN values for every month, suggesting there was a consistent "spot loading effect" in the raw BC data. The loading compensated BC concentration according to a simple compensation model with loading effect was 1.01~1.15 times greater than the raw BC data. The 24-hr average concentration of EC observed during summer sampling period was about 3% higher than the original 24-hr average BC value and 2% lower than the loading compensated BC concentration.