Changes in terrestrial organic matter and pollutant input to the Yangtze River Estuary, East China Sea, during the past century
Xiaoyong Duan A B C , Yanxia Li D , Xianguo Li A , Yi Gao E and Dahai Zhang A F
+ Author Affiliations
- Author Affiliations
A Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 238 Songling Road, Qingdao 266100, P. R. China.
B Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, 62 South Fuzhou Road, Qingdao 266071, P. R. China.
C Qingdao Institute of Marine Geology, China Geological Survey, 62 South Fuzhou Road, Qingdao 266071, P. R. China.
D Weifang University, 5147 East Dongfeng Road, Weifang 261061, P. R. China.
E Qingdao Municipal Drainage Monitoring Station, 8 Tuandao Road, Qingdao 266100, P. R. China.
F Corresponding author. Email: dahaizhang@ouc.edu.cn
Environmental Chemistry 13(4) 631-640 https://doi.org/10.1071/EN15184
Submitted: 3 September 2015 Accepted: 7 October 2015 Published: 15 December 2015
Environmental context. The concentrations of n-alkanes, phthalates and alkylphenols in a dated sediment core from the Yangtze River estuary steadily increased, with evident peaks in c. 1980 and c. 2000. Most of the phthalates and alkylphenols in the core originated from direct industrial and municipal discharges into the lower reaches of the Yangtze River, whereas the n-alkanes were mainly from aquatic and terrestrial plants. The Yangtze River discharge plays an important role in the sedimentary records of organic compounds.
Abstract. The depositional records of phthalate esters (PAEs), alkylphenols (APs) and n-alkanes in the Yangtze River Estuary over the past century were constructed using a dated sediment core to help reconstruct the environmental history. The n-alkane concentrations increased steadily. All the samples had a resolved lower-alkane pattern with well-defined even-over-odd predominance. The n-alkanes originated largely from aquatic and terrestrial plants (83.6 %), the remainder being contributed by way of biotransformation in the land soil and river (16.4 %). The down-core concentration profiles of PAEs and APs increased rapidly, with evident peaks in the 1980s and c. 2000. PAE and AP homologues were dominated by dibutyl phthalate and nonylphenol respectively, originating mainly from industrial and municipal discharges (79.5 %). Long-range transportation from the upper and middle reaches played a much smaller role (20.5 %), especially in recent decades. The changes in the Yangtze River discharge and the modification of the water system played important roles in the transport of organic compounds, especially after the 1950s.
Additional keywords: alkylphenols, depositional record, n-alkanes, phthalate esters.
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