Acute toxicity tests on raw leachate from a Malaysian dumping site

摘要

Leachate samples collected from the Ampar Tenang open dumping site at Dengkil, Malaysia,nwere analyzed for acute toxicity. Two in vivo toxicity tests, Acute Oral Toxicity (AOT) and PrimarynSkin Irritation (PSI), were performed using Sprague Dawley rats and New Zealand Albino rabbits,nrespectively. The leachate samples were also analyzed chemically for nitrate and phosphate,nammonia-nitrogen, Kjeldahl-nitrogen and Chemical Oxygen Demand (COD). Results from both thenAOT and PSI tests showed that the leachate did not contribute to acute toxicity. The AOT testnyielded a negative result: no effect was observed in at least half of the rat population. The PSIntest on rabbits produced effects only at a leachate concentration of 100%. However, the skinnirritation was minor, and the test returned a negative result. The four chemical tests showednhigh levels of nutrient pollution in the leachate. The nitrate and phosphate concentrationsnwere 2.1mg/L and 23.6mg/L, respectively. Further, the ammonia-nitrogen concentration wasn1,000mg NH3-N/L the Kjeldahl-nitrogen level was 446mg NH3-N/L, and the Chemical OxygennDemand was 1,300mg/L. The in vivo toxicity and chemical analyses showed that the leachate isnpolluted but not acutely toxic to organisms.