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The Zarka, a shallow, relatively small river flowing through a semi-arid region of Jordan is the country's main water course. Its prime source is discharge from a large overloaded waste treatment plant centred on stabilization ponds. Between May 1990 and January 1992, NH 4 -N concentrations of up to 130 mg/l were recorded at the river source, and an average 76 mg/l NO 3 -N at the...
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