Spatial trends of nitrate pollution and groundwater chemistry in Shimabara, Nagasaki, Japan

Nakagawa, Kei; Amano, Hiroki; Asakura, Hiroshi; Berndtsson, Ronny

doi:10.1007/s12665-015-4971-9

Cited by 63 publications

(43 citation statements)

References 21 publications

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“…The application and results of the SOM support our previous conclusion (Nakagawa et al 2016) 326 regarding the spatial distribution of nitrate pollution in the study area and its causes. Data that display a 327 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ...…”

Section: Summary and Conclusion 306supporting

confidence: 84%

“…However, the Shimabara 53 groundwater has been increasingly polluted by nitrate since 1988. We analyzed the present situation of 54 groundwater pollution by nitrate in Shimabara and showed that agricultural activities are the main polluter 55 of the groundwater (Nakagawa et al 2016). To better understand characteristics of the water chemistry, 56 multivariate analysis such as principal component analysis (PCA), which can reduce data dimensionality 57 and extract synthetic indexes with minimum information loss, is often used (e.g., Aiuppa et al 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 1...…”

Section: Revised_manuscript_without_commentsmentioning

confidence: 99%

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Classification of groundwater chemistry in Shimabara, using self-organizing maps

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21Shimabara City in Nagasaki Prefecture, Japan, is located on a volcanic peninsula that has 22 abundant groundwater. Almost all public water supply use groundwater in this region. For this reason, 23 understanding groundwater characteristics is a pre-requisite for proper water supply management. Thus, 24we investigated the groundwater chemistry characteristics in Shimabara by use of self-organizing maps 25

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Section: Summary and Conclusion 306supporting

confidence: 84%

Section: Revised_manuscript_without_commentsmentioning

confidence: 99%

Classification of groundwater chemistry in Shimabara, using self-organizing maps

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“…The correlation between nitrate and total dissolved solids may be related to geological factors, and it may also be related to the use of fertilizers. The positive correlation between nitrate and the total hardness may be related to the large-scale application of fertilizers in crop production [22], and it could also be related to geological factors. Positive correlation between nitrate and chloride may be related to the pollution effects of feces and livestock waste [23].…”

Section: Discussionmentioning

confidence: 99%

The analysis of groundwater nitrate pollution and health risk assessment in rural areas of Yantai, China

Yu¹,

Wang

Liu³

et al. 2020

BMC Public Health

116

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Background: Nitrate is one of the most common chemical contaminants of groundwater, and it is an important unqualified factor of rural groundwater in Yantai. In order to assess the risk of exposure to drinking water nitrate for adults and juveniles, in recent years, we monitored the nitrate concentrations in rural drinking water,a model was also used to assess the human health risk of nitrate pollution in groundwater. Methods: From the year 2015 to 2018, the drinking water in rural areas of Yantai was tested according to the "Sanitary Standard for Drinking Water" (GB5749-2006). The principal component analysis was used to analyze the relationship between groundwater chemicals and nitrate. The model was used to assess human health risks of groundwater nitrate through the drinking water and skin contact. Results: A total of 2348 samples were tested during the year 2015-2018.Nitrate and total dissolved solids, total hardness, chloride are all relevant, the above indicators may come from the same source of pollution; The median nitrate content (C EXP50) was 17.8 mg / L; the risk of exposure in each group was ranked as: Juveniles > Adult female > Adult male;the median health risk (HQ 50) for minors and adults exceed 1. Conclusions: The concentrations of nitrate is stable and does not change over time. The high concentration of nitrate in rural areas of Yantai may be the result of the interaction of fertilizers and geological factors. The risk of exposure to nitrate in juveniles and adults is above the limit, so it is necessary to be on the alert for the high levels of nitrate.

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“…However, due to intensive agricultural activities, the nitrate level in groundwater has increased to above the Japanese drinking water quality standard (10 mg L -1 ). According to Nakagawa et al (2016), 38% (15 out of 40 groundwater wells) exceed the permissible NO 3 -N + NO 2 -N concentration. The nitrate pollution in groundwater has been shown to be related to chemical fertilizer and livestock waste by use of the correlation matrix for major dissolved ion components.…”

Section: Introductionmentioning

confidence: 99%

On the use of coprostanol to identify source of nitrate pollution in groundwater

Nakagawa

Amano

Takao

et al. 2017

Journal of Hydrology

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Spatial trends of nitrate pollution and groundwater chemistry in Shimabara, Nagasaki, Japan

Abstract: 16Groundwater nitrate contamination in agricultural areas is a common problem in many parts of 17 the world. The important agricultural district Shimabara in Nagasaki, Japan, is also

Cited by 63 publications

References 21 publications

Classification of groundwater chemistry in Shimabara, using self-organizing maps

Classification of groundwater chemistry in Shimabara, using self-organizing maps

The analysis of groundwater nitrate pollution and health risk assessment in rural areas of Yantai, China

On the use of coprostanol to identify source of nitrate pollution in groundwater

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