Abstract
Contamination of groundwater by nitrate is considered a global problem. Nitrates are introduced in the groundwater from a variety of sources like agricultural activities, poor sewer system, wastewaters, and industrial activities. In the present research, a survey of wells (n = 1,060) was undertaken in all 13 regions of the Kingdom of Saudi Arabia to assess the contained nitrate (NO3) levels. The results indicated variation in nitrate levels from 1.1 to 884.0 mg/L as NO3 throughout the Kingdom. The average nitrate levels in milligrams per liter as NO3 were as follows in descending order: 65.7 (Jizan), 60.3 (Asir), 60.0 (Qassim), 51.3 (Hail), 41.8 (Makkah Al Mukaramma), 41.3 (Madina Al Munnawara), 38.0 (Al Baha), 37.0 (Najran), 30.7, (Tabouk), 25.2 (Eastern Province), 18.8 (Riyadh), 15.8 (Al Jouf), and 9.1 (Hadwed Shamalyah). The results indicated that nitrate levels exceeded the maximum contaminant limits for drinking water (45 mg/L as NO3) in a number of wells (n = 213) in different regions of the Kingdom. The maximum and minimum wells exceeding the maximum contaminant limits for nitrate in drinking water were in Jizan (52.6%) and Hadwed Shamalyah (4.9%), respectively. Most of the wells which exceeded the maximum allowed limits for nitrate were in the areas which were used for agricultural and residential purposes.
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Alabdula’aly, A.I., Al-Rehaili, A.M., Al-Zarah, A.I. et al. Assessment of nitrate concentration in groundwater in Saudi Arabia. Environ Monit Assess 161, 1–9 (2010). https://doi.org/10.1007/s10661-008-0722-7
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DOI: https://doi.org/10.1007/s10661-008-0722-7