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Water and soil samples were collected from five different industrial areas around Dhaka city namely, (i) Powertex Fashion Ltd., Gazipur (Textile), (ii) Shetu Pesticide Ltd., Savar (Pesticide), (iii) Salma Leather Industry, Hazaribagh (Tannery), (iv) Monno Ceramic Industries, Nayarhat, Dhamrai, (Ceramic) and (v) ACME Laboratories Ltd., Tulivita, Dhamrai (Pharmaceutical) where selected for this study. Two plants species viz. Colocasia esculenta (L.) Schott and Ipomoea aquatica Forssk. commonly growing in the industrial effluent affected areas were selected to observe the rate of heavy metal uptake. Dissolved oxygen (DO) was found below the permissible limit in all the affected areas (lowest 0.88 mg/l in tannery waste affected areas) indicating high amount of organic wastage discharge from tannery. Eight trace metals viz. arsenic, cadmium, nickel, iron, zinc, chromium, copper and lead were analysed for water, soil and plant samples. Arsenic and cadmium exceeded the permissible limit in water sample collected from all affected areas. Tannery waste affected area was found to be the most vulnerable area in respect to arsenic and chromium contamination. On the other hand, the highest amount of arsenic was found in the soil sample collected from pesticide affected area. The rate of heavy metal uptake in Colocasia esculenta (L.) Schott is much higher than Ipomoea aquatica Forssk. More heavy metals were accumulated in edible portion than roots of the plants. Introduction Industrial effluents are one of the major sources for direct and often continuous input of pollutants/toxicants into aquatic ecosystems with long-term implications (Odeigah and Osanyipeju 1995, Chan et al. 2003, Lah et al. 2004, Smolders et al. 2004). As a result of continuous input of different pollutants, it lowers the quality of life in various aspects and affects health and life span (Grover and Kaur 1999). Rapid industrialization of Bangladesh for the last two decades resulted above 30,000 large and small industries which are destructing our riverine system by discharging their effluents (Rahman et al. 2001). Most of the industries and factories are present in and around Dhaka city (Islam et al. 2011). The industries are situated on the banks of the river Buriganga, Turag etc. or very close to the river system. Among the industries, textile, leather, paint, pesticides, pharmaceuticals laboratories are northworthy (DoE 1997). Unfortunately, these industries do not follow any biosafety guideline. Even they do not have recommended waste management system, discharging their effluents directly into the different water bodies around the metropolis. Besides rivers and streams, industrial effluents are also discharging into low-lying lands, causing soil pollution (Rahman et al. 2001). Textile, paper pulp, food, fish, tannery and distillery industries are mainly discharging biodegradable organic wastes (Rahman et al. 2001). These wastes undergo aerobic (i.e., using oxygen) decomposition in the receiving water body (Lenore et al. 1998). As a result, the oxygen content of water goes down, endangering fish and other aquatic *Author for correspondence: <ssalam81@yahoo.com>.

bangladesh journal of botany

Physical and chemical parameters and trace metal flux in water, soil and plant samples collected from industrial effluent affected areas in and around Dhaka city