Electrochemical techniques were successfully employed to estimate contamination of water of river Buriganga, Bangladesh. A Pt–Cu electrode has been exploited to measure selective nitrate concentration, and corrosion rate of iron has been proposed to indicate relative abundance of dissolved contaminants. In order to evaluate the pollution level, water parameters of river Buriganga have been compared with those obtained from two freshwater streams named Surma and Dawki of the country. An iron strip in contact with Buriganga river water is corroded three times rapidly compared to its contact with Dawki or Surma river water indicates acute contamination of Buriganga river water. The River Buriganga is facing acute pollution from the point of high TDS (0.664–0.694 g/L), low DO (1.47–4.4 mg/L), high COD (197–218 mg/L), high ammonia (270–420 mg/L) and high nitrate concentration (107–157 mg/L). Negative ORP value (− 292 to − 310 mV) of Buriganga river water indicates that the stream contains high level reducing species. Meanwhile, positive ORP value indicates that Dawki (+ 203 to + 209 mV) and Surma (+ 184 to + 205 mV) river water contain oxidizing species. Sediment analysis shows the deposition of disintegrated organic pollutants on the bottom of the River Buriganga. Cost-effective carbon material synthesized from taro stems has been proposed to restore water parameters of filthy water system like Buriganga river.

中文翻译：

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芋头炭对环境水的急性污染及水质恢复的电化学分析

电化学技术已成功用于估算孟加拉国布里甘加河的水污染。已经开发出一种Pt-Cu电极来测量选择性硝酸盐浓度，并且已经提出了铁的腐蚀速率以指示溶解的污染物的相对丰度。为了评估污染水平，已将布里甘加河的水参数与该国的两个淡水河流Surma和Dawki的水参数进行了比较。与Buriganga河水接触的铁条与与Dawki或Surma河水接触的铁条被腐蚀的速度快三倍，这表明Buriganga河水受到了严重污染。从高TDS（0.664–0.694 g / L），低DO（1.47–4.4 mg / L），高COD（197–218 mg / L）的角度来看，布里甘加河正面临着严重的污染，高氨水（270–420 mg / L）和高硝酸盐浓度（107–157 mg / L）。布里甘加河水的ORP值为负（-292至-310 mV）表明该溪流含有高水平的还原物质。同时，正ORP值表示Dawki（+ 203至+ 209 mV）和Surma（+ 184至+ 205 mV）河水中含有氧化性物质。沉积物分析表明，分解的有机污染物在布里甘加河的底部沉积。已经提出了由芋头茎合成的具有成本效益的碳材料，以恢复Buriganga河等脏水系统的水参数。ORP值为正值表示Dawki（+ 203至+ 209 mV）和Surma（+ 184至+ 205 mV）河水中含有氧化性物质。沉积物分析表明，分解的有机污染物在布里甘加河的底部沉积。已经提出了由芋头茎合成的具有成本效益的碳材料，以恢复Buriganga河等脏水系统的水参数。ORP值为正值表示Dawki（+ 203至+ 209 mV）和Surma（+ 184至+ 205 mV）河水中含有氧化性物质。沉积物分析表明，分解的有机污染物在布里甘加河的底部沉积。已经提出了由芋头茎合成的具有成本效益的碳材料，以恢复Buriganga河等脏水系统的水参数。