کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
83184 158694 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spatial distribution of nitrate health risk associated with groundwater use as drinking water in Merida, Mexico
ترجمه فارسی عنوان
توزیع فضایی خطر نیتروژن در ارتباط با استفاده از آبهای زیرزمینی به عنوان آب آشامیدنی در مریادا، مکزیک
کلمات کلیدی
نیترات، آب های زیرزمینی، آب آشامیدنی، آبخوان کارستی، توزیع فضایی، خطرات بهداشتی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک جنگلداری
چکیده انگلیسی


• Spatial distribution of health risk by nitrates in drinking water was evaluated.
• Nitrate sources were identify through linear regressions with other ions.
• Regionalization is important to identify the nitrate hot spots in water supply.
• Nitrates showed the higher concentrations associated to anthropogenic activities.
• Nitrates in drinking water showed a high health risk in bottle-fed infants.

Water containing nitrate levels above 45 mg/l is not recommended for human consumption and its prolonged intake is associated with various health conditions. In Merida city, Mexico, the only source for water supply is a karstic aquifer, but the absence of sewerage and drainage networks makes it highly vulnerable to anthropogenic contamination. In this work, the concentration and spatial distribution of nitrate in the Merida's karstic aquifer were assessed by statistical and geostatistical techniques. The sources of nitrate contamination were tracked by making statistical correlations between nitrate concentrations and key ions; the potential risk to human health was also estimated by using the Hazard Index (HI). A total of 177 groundwater samples were collected from the four water supply systems serving Merida, during 2012 and 2013. Nitrate concentrations from collected samples varied between 15.51 and 70.61 mg/l, with maximum and minimum concentrations per sampling point ranging from 47.47 to 70.61 mg/l and from 15.51 to 17.32 mg/l, respectively. Significant positive correlations (P < 0.05) between nitrates and chlorides, sulphates and potassium were found, which may indicate potential contamination from domestic wastewater and agricultural activities. The spatial distribution of nitrate concentrations in the aquifer revealed an increase in nitrates following a trajectory South–North West, towards central and northwestern zones within Merida Metropolitan Area. From the health risk analysis, it was found that infants exposed at current nitrate levels are at a higher risk (HIMAX = 1.40) than adults (HR < 1.0) and therefore, there is a clear need for implementing effective strategies to protect groundwater quality and to better manage and control nitrate pollution sources.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Geography - Volume 65, December 2015, Pages 49–57
نویسندگان
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