Under strong influence of human activity,dust on urban street accumulates a large number of heavy metals difficult to be decomposed. Under certain dynamic conditions, dust with heavy metals enter into the air by re-su...Under strong influence of human activity,dust on urban street accumulates a large number of heavy metals difficult to be decomposed. Under certain dynamic conditions, dust with heavy metals enter into the air by re-suspension ,which harms environmental system and human health. Before and after fireworks igniting during Spring Festival of 2014,111 dust samples were randomly collected in Beijing, Tianjin, Shangqiu of Henan Province, and Shaoxing of Zhejiang Province and then Pb, Cr, Zn, As, Cu and Ni content was nondestructively analyzed. The results showed that when compared with soil background value, dust collected in Beijing very strongly accumulated Zn and Cu ;strongly accumulated Pb, moderately accumulated Cr due to human activities, while weakly accumulated As and Ni implying a little effect of human activity. Influenced by industry and port, heavy metals content in dust from coastal cities including Pb from Shaoxing, Cr from Tianjin and Shaoxing, Zn from Tianjin and Ni from Shaoxing, were relatively higher than that from inland cities including Beijing and Shangqiu. Otherwise, the average content of Cu in dust from Beijing was higher than that from other cities, probably released from smelting, fireworks igniting, and burning or abrading from automobile＇s gasoline, engine, lubricating oil or gold-plated parts. Fireworks igniting could variably increase the content of most heavy metals in dust. Cu content increased by 192.57%, Pb and Zn did by 23.73% and 34.05% respectively; Cr and Ni raised unobviously by 4.48% and 2.41% respectively.展开更多
基金Supported by National Natural Science Foundation of China(41475133)Beijing Municipal Natural Science Foundation(8142017)
文摘Under strong influence of human activity,dust on urban street accumulates a large number of heavy metals difficult to be decomposed. Under certain dynamic conditions, dust with heavy metals enter into the air by re-suspension ,which harms environmental system and human health. Before and after fireworks igniting during Spring Festival of 2014,111 dust samples were randomly collected in Beijing, Tianjin, Shangqiu of Henan Province, and Shaoxing of Zhejiang Province and then Pb, Cr, Zn, As, Cu and Ni content was nondestructively analyzed. The results showed that when compared with soil background value, dust collected in Beijing very strongly accumulated Zn and Cu ;strongly accumulated Pb, moderately accumulated Cr due to human activities, while weakly accumulated As and Ni implying a little effect of human activity. Influenced by industry and port, heavy metals content in dust from coastal cities including Pb from Shaoxing, Cr from Tianjin and Shaoxing, Zn from Tianjin and Ni from Shaoxing, were relatively higher than that from inland cities including Beijing and Shangqiu. Otherwise, the average content of Cu in dust from Beijing was higher than that from other cities, probably released from smelting, fireworks igniting, and burning or abrading from automobile＇s gasoline, engine, lubricating oil or gold-plated parts. Fireworks igniting could variably increase the content of most heavy metals in dust. Cu content increased by 192.57%, Pb and Zn did by 23.73% and 34.05% respectively; Cr and Ni raised unobviously by 4.48% and 2.41% respectively.
