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Drilling Industry News

Drinking Water in Gaza Strip Contaminated with High Levels of Nitrate

October 9, 2008

Palestinian and German scientists have recommended to the authorities in the Gaza Strip that they take immediate measures to combat excessive nitrate levels in the drinking water. Of their water samples, 90 percent were found to contain nitrate concentrations that were between two times and eight times higher than the limit recommended by the World Health Organization (WHO), say the researchers from the University of Heidelberg and the Helmholtz Centre for Environmental Research (UFZ). For the long term, they recommend that quality management of ground water resources would provide the best protection.

Ground water is the only source of drinking water for the majority of people living in the Gaza Strip. In babies younger than six months, nitrate can lead to methaemoglobinaemia, to diarrhea and to acidosis. The WHO therefore recommends keeping nitrate levels to 50 milligrams per liter or less. According to unpublished research, half of the 640 infants tested already were showing signs of methaemoglobinaemia. The new Palestinian-German study confirms earlier water analyses, and is the first study to pinpoint a source of the contamination. With the help of isotope analyses, the researchers were able to demonstrate that the nitrate pollution can be traced back to manure used in farming and to wastewater.

With more than 2,600 people per square kilometer, the Gaza Strip is one of the most densely populated areas on earth. Because of their isolation, the inhabitants of this area between the Mediterranean, Egypt and Israel rely on self-sufficiency. The fields are mostly fertilized with chicken and cow dung. Artificial fertilizers account for only around a quarter of the fertilizer used. Because of the area's geology and the semi-arid climate, it is fairly easy for impurities to seep down from the surface into the aquifer system.

Organic fertilizers and wastewater are the main causes of the nitrate contamination in the ground water, followed by sewage sludge and artificial fertilizers. This was revealed by the isotope ratios of nitrogen and oxygen in the nitrate. "The lower 15N nitrogen isotope values in the sewage sludge indicate that the nitrate in the Gaza ground water comes primarily from manure used as fertilizer," explains Dr Karsten Osenbrück of the UFZ.

Between 2001 and 2007, the scientists took water samples from 115 municipal wells and 50 private wells on seven occasions. They measured nitrate concentrations, and only 10 of the 115 municipal wells examined were found to have a nitrate level below the WHO guideline value. The situation with the private wells was equally serious: Apart from three, all the wells were found to have nitrate levels that were between five times and seven times higher than the WHO recommendations.

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