Before 1970s the Second Songhua River and Ji Canal of China had been polluted seriously by mercury. During peak pollution period, mercury levels in water, sediment and fish body of these rivers were close to or even h...Before 1970s the Second Songhua River and Ji Canal of China had been polluted seriously by mercury. During peak pollution period, mercury levels in water, sediment and fish body of these rivers were close to or even higher than that of famous Minamata Bay of Japan. Some residents who live near to the polluted rivers were affected and the methyl mercury values in their blood, hair and urine were higher than normal people obviously . Since the fish had decreased even vanished in these rivers, so the food chain that transfers mercury to human also was out off almostly. However, nervous symptoms of Minamata disease were discovered among fisherman who had eaten more fishes. This report relates the stories about the mercury pollution of the Second Songhua River and Ji Canal.展开更多
Fifty years have passed from the first official recognition of the methylmercury （MeHg） poisoning in Niigata （so called the second Minamata disease）, Japan in 2015. The first case of MeHg poisoning was found in Ja...Fifty years have passed from the first official recognition of the methylmercury （MeHg） poisoning in Niigata （so called the second Minamata disease）, Japan in 2015. The first case of MeHg poisoning was found in January 1965, when two surveys were carried out for 20,000 inhabitants lived within 15 km from the mouth of the Agano river. From these surveys, 26 cases （including 5 cases of death） were officially recognized as MeHg poisoning. Moreover, 9 cases who had no symptoms but whose hair mercury concentration were over 200 ppm were found. Within 20 cases, 15 cases are among 26 cases officially recognized as having MeHg poisoning and 5 cases are among 9 cases who had no symptoms but whose hair mercury concentration were over 200 ppm in 1965. The distal dominant sensory disturbances of the extremities lasted for more than several decades among 20 cases. The sensory disturbance of the bilateral distal extremities could be used as the gold standard for the diagnosis of MeHg poisoning in the exposed areas. The distal dominant sensory disturbance of the extremities is a typical characteristic and important sign of the MeHg poisoning.展开更多
文摘Before 1970s the Second Songhua River and Ji Canal of China had been polluted seriously by mercury. During peak pollution period, mercury levels in water, sediment and fish body of these rivers were close to or even higher than that of famous Minamata Bay of Japan. Some residents who live near to the polluted rivers were affected and the methyl mercury values in their blood, hair and urine were higher than normal people obviously . Since the fish had decreased even vanished in these rivers, so the food chain that transfers mercury to human also was out off almostly. However, nervous symptoms of Minamata disease were discovered among fisherman who had eaten more fishes. This report relates the stories about the mercury pollution of the Second Songhua River and Ji Canal.
文摘Fifty years have passed from the first official recognition of the methylmercury （MeHg） poisoning in Niigata （so called the second Minamata disease）, Japan in 2015. The first case of MeHg poisoning was found in January 1965, when two surveys were carried out for 20,000 inhabitants lived within 15 km from the mouth of the Agano river. From these surveys, 26 cases （including 5 cases of death） were officially recognized as MeHg poisoning. Moreover, 9 cases who had no symptoms but whose hair mercury concentration were over 200 ppm were found. Within 20 cases, 15 cases are among 26 cases officially recognized as having MeHg poisoning and 5 cases are among 9 cases who had no symptoms but whose hair mercury concentration were over 200 ppm in 1965. The distal dominant sensory disturbances of the extremities lasted for more than several decades among 20 cases. The sensory disturbance of the bilateral distal extremities could be used as the gold standard for the diagnosis of MeHg poisoning in the exposed areas. The distal dominant sensory disturbance of the extremities is a typical characteristic and important sign of the MeHg poisoning.
