Perchlorate Behavior in a Municipal Lake Following Fireworks Displays

• Published in: Environmental science & technology Vol. 41; no. 11; pp. 3966 - 3971
• Main Authors: Wilkin, Richard T, Fine, Dennis D, Burnett, Nicole G
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.06.2007
• Subjects: Adsorption; Applied sciences; Chemicals; Chemistry; Continental surface waters; Deuterium; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Environmental Monitoring; Exact sciences and technology; Fireworks; Fresh Water - chemistry; Freshwater; Natural water pollution; Oxygen Isotopes; Perchlorates - analysis; Perchlorates - chemistry; Pollution; Pollution, environment geology; Seasons; Surface water; Time Factors; Water Pollutants - analysis; Water Pollutants - chemistry; Water treatment and pollution; Cameroon, Centre, Yaounde, Municipal L; Biodegradation; Microbial activity; Chemisorption; Sediment water interaction; Pollutant behavior; Lake sediments; Perchlorates; Pyrotechnics; Adsorption; Selfpurification; Biotransformation; Surface water; Lakes; Water pollution
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es0700698

Perchlorate salts of potassium and ammonium are the primary oxidants in pyrotechnic mixtures, yet insufficient information is available regarding the relationship between fireworks displays and the environmental occurrence of perchlorate. Here we document changes in perchlorate concentrations in surface water adjacent to a site of fireworks displays from 2004 to 2006. Preceding fireworks displays, perchlorate concentrations in surface water ranged from 0.005 to 0.081 μg/L, with a mean value of 0.043 μg/L. Within 14 h after the fireworks, perchlorate concentrations spiked to values ranging from 24 to 1028× the mean baseline value. A maximum perchlorate concentration of 44.2 μg/L was determined following the July 4th event in 2006. After the fireworks displays, perchlorate concentrations decreased toward the background level within 20 to 80 days, with the rate of attenuation correlating to surface water temperature. Adsorption tests indicate that sediments underlying the water column have limited (<100 nmol/g) capacity to remove perchlorate via chemical adsorption. Microcosms showed comparatively rapid intrinsic perchlorate degradation in the absence of nitrate consistent with the observed disappearance of perchlorate from the study site. This suggests that at sites with appropriate biogeochemical conditions, natural attenuation may be an important factor affecting the fate of perchlorate following fireworks displays.