• 한국지하수토양환경학회지:지하수토양환경
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• 제26권4호
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• pp.8-19
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• 2021

In this study, the evaluation standard for nitrate nitrogen contamination degree (WELCUP) was established using six factors that influence the groundwater quality in Jeju Island. To do this, weightings, ranges, and ratings were assigned for each factor and the relative possibility of nitrate nitrogen contamination degree was evaluated using WELCUP index for each well. As a result of calculating the WELCUP index using groundwater quality data of 5,112 wells in Jeju Island for 27 years (1993-2019), all 61 wells with the WELCUP index value higher than 100 are distributed in Daejung and Hangyung watershed with relatively large area of farmland in Jeju Island. In particular, as the ratio of private wells is more than 64%, it is necessary that systematic management is needed for private wells in terms of nitrate nitrogen contamination. Consequently, based on the results of applying the WELCUP evaluation standard, it is necessary to select the prioritization of nitrate nitrogen contamination pathways project for groundwater wells in Jeju Island.

• 한국지하수토양환경학회지:지하수토양환경
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• 제17권1호
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• pp.22-32
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• 2012

This study suggests a method to grade groundwater quality quantitatively using statistical approaches for evaluating the quality of groundwater in wells included in the Groundwater Quality Monitoring Network (GQMN). The proposed analysis method is applied to GQMN data from 2001 to 2008 for nitrate nitrogen, chloride, trichloroethylene, potential of hydrogen (pH), and electrical conductivity. The analysis results are obtained as groundwater quality grades of the groundwater representing each of the monitoring stations. The degree of groundwater contamination is analysed for water quality parameters, district, and usage. The results show that the degree of groundwater contamination is relatively high by nitrate nitrogen, bacteria and electrical conductivity and at Seoul, Incheon, Gwangju, Gyeonggido and Jeollado. The degree of contamination by nitrate nitrogen and trichloroethylene is especially high when the groundwater is used for agricultural and industrial water, respectively. It is evaluated that potable groudnwater in GQMN is significantly vulnerable to nitrate nitrogen and bacteria contamination.

• 분석과학
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• 제31권3호
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• pp.122-133
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• 2018

본 연구에서는 광주지역 민방위비상급수시설 101 개소를 대상으로 2006년부터 2016년까지 11년 동안 측정한 지하수 수질자료를 통계적으로 분석하였으며, 각 시설별로 먹는물 수질기준 초과횟수와 평균농도 분석 및 경향성 분석을 실시하고, 그 분석결과를 이용하여 4 개의 오염등급으로 구분하였다. 또한 이를 바탕으로 토지이용 현황별로 각 항목의 지하수 오염도를 평가하였다. 통계적으로 유의한 민방위 비상급수 15 개 항목에 대한 수질기준초과횟수, 평균농도분석, 경향성분석의 세가지 오염지시인자를 분석하여 합산한 결과 Turbidity (51.5 %) > Color (32.7 %) > Nitrate nitrogen (28.7 %) > Hardness (25.7 %) 순으로 오염 지시율이 상대적으로 높게 평가되었다. 오염등급 분석결과 안전(0)부터 오염심각(3)까지 오염등급이 다양하게 분포한 Turbidity, Color, Nitrate nitrogen의 3 개 항목을 제외하면 12 개 항목의 수질 오염등급은 전체의 25 %는 '오염가능한 등급(1)'으로, 75%는 '안전한 등급(0)'으로 평가되었다. QGIS를 이용하여 오염 지시율이 높게 평가된 4 개 항목(Turbidity, Color, Nitrate nitrogen, Hardness)은 오염지도에 작성하여 오염등급을 시각화하였다.

• 한국환경보건학회지
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• 제46권6호
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• pp.646-654
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• 2020

Objectives: Users of parks or children's play facilities have pointed to pets' bowel movements as the most serious problem when using them. In prior studies, a very low detection rate of parasites (eggs) in sand flooring materials has been found. Even though feces have been identified, no parasites (eggs) have been detected. Method: A standard solution of nitrate nitrogen was used to verify the reliability of a new nitrogen analysis method. The linearity, precision, and accuracy of the nitrate nitrogen analysis method were verified. Using this method, the pollution distribution of the sand flooring material and the degree of pollution at each point were investigated. Results: As a result of the verification of the nitrogen analysis method, the linearity was found to be good at r2=0.999 when distilled water is mixed in a standard substance solution. The standard substance additive solution r2=0.968 was found to be good. Precision represented 0.01 to 0.06% RSD for peak height. The recovery rate was 92.4 to 104.0 percent, indicating high accuracy. According to the same method of analysis, the flooring material sand at a general amusement facility with the largest number of concealed spaces was nitrate nitrogen 6.1 times higher than at the entrance of the playground. Also, in a comparison between clean sand and sandy flooring, the average nitrogen concentration of the sand flooring material was 24.4-167 times higher than pure sand. Conclusions: As such, no parasites (eggs) were detected at all points under investigation, but the sand flooring was exposed to animal fecal contamination. Therefore, the management of nitrogenous components should allow accurate identification of animal fecal contamination so that the timing of sand replacement can be managed hygienically and safely.

• 한국수산과학회지
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• 제46권4호
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• pp.424-436
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• 2013

Organic enrichment was investigated in surface sediments from the Yeoja and Gangjin Bays of Korea, which contain dense shellfish farms, in order to evaluate the contamination status and temporal changes in shellfish farming along these coasts. The degree of organic enrichment was determined using geochemical indicators (chemical oxygen demand, ignition loss, acid volatile sulfide, total organic carbon in sediments, and total nitrogen in sediments, ammonium and nitrate in pore water, and bioluminescence inhabitation for sediments). Temporal changes in organic enrichment conditions were detected by comparing our 2012 data to those previously reported from a survey conducted in 1999/2000. Organic enrichment was significantly higher in September than in May and July, in Gangjin Bay than in Yeoja Bay, and significantly higher in shellfish farms than in reference sites not used to culture shellfish. Ammonium concentrations in pore water were two orders of magnitude greater than nitrate concentrations, suggesting that these bays represent nitrogen-reducing environments.

• 한국환경농학회지
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• 제13권1호
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• pp.19-30
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• 1994

본 연구는 제주도의 인구밀집 지역인 호텔, 상가 및 아파트 밀집지역에서 음용수로 사용하고 있는 지하수의 $NO_3-N$, pH, $SO_4$, Cl 및 hardness의 오염정도, 월별 및 연별 이들 물질의 농도변화를 조사하기 위하여 수행되었다. 지하수 시료는 10개 지역의 31개 관정에서 1987년부터 1992년까지 월 1회 시료를 채취하여 분석하였다. $NO_3-N$의 농도는 시료 No. 23을 제외하고 음용수 수질기준인 10mg/l을 초과하지 않았다. 비오염지역으로 분류된 10 지역의 $NO_3-N$ 농도는 1mg/l 이하에서 1.2mg/l을 약간 상회하였으나, 8 지역은 $5{\sim}8mg/l$ 범위에 있었고 평균 5.1mg/l으로 10 지역에 비하여 5배 이상 높았다. 1 지역의 시료 No. 1, 2, 4 및 8번 지하수는 연평균 1.2mg/l로 증가되었으며, 특히, 시료 No. 23은 '87년의 4.1mg/l에서 '91년의 12.6mg/l으로 연평균 2.1mg/l 증가되었다. 1, 2, 3, 4, 5, 6 및 7 지역 지하수의 pH는 pH 7-8.1로서 10 지역과 비슷하였으나, 8 지역은 pH 6.6-7.3으로서 낮은 편이었다. 경도는 1, 2, 3, 4, 5 및 6 지역이 30-80mg/l로서 10 지역에 비하여 높은 편이었으며, 그 중 8 지역이 가장 높았다. 이와 같은 결과로 보아 조사지역의 지하수는 앞으로 점차 오염의 문제가 발생할 수 있을 것으로 예상되었다.