Perchlorate from fireworks.
Chatterjee
Rhitu
R
D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry*; D010472:Perchlorates / Q000032:analysis*; D017680:Potassium Compounds / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D010472:Perchlorates; D017680:Potassium Compounds; D014874:Water Pollutants, Chemical; C009006:potassium perchlorate