Semi-volatile organic pollutants in Jordanian surface water

Jordan relies heavily on rainwater stored in reservoirs because it has extremely limited alternative water resources. These reservoirs are essential for drinking water and irrigation, so monitoring their water quality is extremely important. In this study we monitored 55 semi-volatile organic chemicals (SVOCs) in monthly samples from the Zarqa River and three reservoirs between April and August 2010, and also screened the samples for non-target pollutants. Twelve SVOCs were detected and quantified at King Talal Dam followed by ten at Zarqa River and four each at Wadi Al-Arab and Mujib dams. Phenol and phthalate esters were detected at wide range concentrations (0.01–25μg/L) in all water samples. Phenol has the highest level at the Zarqa River (18.5±5.5μg/L) followed by King Talal (12.5±2.5μg/L) and Wadi Al-Arab (2.5±0.63μg/L). Phthalate esters (total) were detected at the Zarqa River, King Talal, Wadi Al-Arab, and Mujib dams at levels 3.85, 3.75, 1.03 and 0.12μg/L. Other contaminants, including polyaromatic hydrocarbons (PAHs), were detected at low concentrations in the King Talal Dam reservoir and Zarqa River samples. Two non-targeted phosphate plasticizers, tri-n-butylphosphate and tris(2-chloroethyl)phosphate were identified in the July and August Zarqa River samples. A comparison study reveals that SVOC pollution of surface water in Jordan is within acceptable international limits, but long-term monitoring programs should be implemented.