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The process of paper production requires a huge quantity of water and energy and in turn contributes a number of effluents in the form of phenolics, toxic organic compounds and heavy metals in wastewater (leachate). The present investigation was aimed to assess the toxic effects of leachate on liver micro-architecture and heavy metal elements of the liver. Eighteen (18) healthy male Wistar rats (240 Â± 10g) were selected and acclimatized prior to experimental treatment. These rats were randomly divided into three groups viz, Control group (received 4ml/ kg normal saline), Group 1 (4ml/ kg leachate) and Group 2 (4ml/ kg 1:10 diluted leachate). All the animals were dissected and liver tissues were collected and processed accordingly after 24 h of leachate treatment. High level of cadmium and chromium were found in Group 1 as compared to the control group upon liver metal contents analysis found out by flame atomic absorption spectrometer. A clear disruption of micro-architecture of the liver, congested sinusoids, damaged central vein, and perturbed morphology was observed in Group-1 as revealed by H & E staining. Moreover, loss of polarity, congestion, and disruption of hepatocytes and pronounced vacuolization in the cytoplasm was observed in Group 2 compared to control sections. On the basis of above findings, it can be concluded that paper industry leachate is highly toxic and its intraperitoneal injection results in hepatotoxicity that not only affects the hepatic micro-architecture but also results in perturbed liver metal contents. Therefore, proper treatment of such wastewater is required before its disposal.

Assessing the Hepatotoxicity of Industrial Leachate; Histopathology and Heavy Metal Contents in Liver of Wistar Rats