THE ASSESSMENT OF BENTHIC MACROINVERTEBRATE >From that research we find out that there is a degradation in water quality and >benthic macro-invertebrate community in Surabaya River on October 2002 compared to >those on August 2002. We wanted to observe the impact of effluent spill from PT Aneka >Kimia Nusantara on late of August so we sampled the water on October 2003 and >fortunately we have monitored the water quality and benthic community in early of >August before the effluent spill so we have a comparative data. We identified 19 >species on August and 14 species on October. We suspect that this species decrease >was caused by the spill and also by effluent from other industries along Surabaya >River.From this study we should worry about the condition of the ecosystem of >Surabaya River that keep getting degraded along 2002. The water was contaminated by >mercury pollution that reach 0,0892 mg/l in water sampled at Driyorejo Station or 89 >times bigger from the water quality standard (0,001 mg/l). We suspect the mercury >source were from reused battery industry in Driyorejo and also from domestic waste >such as battery and halogen lamp etc along Surabaya River.
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