Cite this paper:
SHEN Qiushi, ZHANG Lu, Ismael Aaron KIMIREI, WANG Zhaode, GAO Qun, CHEN Shuang, YU Cheng. Vertical physicochemical parameter distributions and health risk assessment for trace metals in water columns in eastern Lake Tanganyika, Tanzania[J]. HaiyangYuHuZhao, 2019, 37(1): 134-145

Vertical physicochemical parameter distributions and health risk assessment for trace metals in water columns in eastern Lake Tanganyika, Tanzania

SHEN Qiushi1,2, ZHANG Lu1,2, Ismael Aaron KIMIREI1,3, WANG Zhaode1,2, GAO Qun1,2, CHEN Shuang1,2, YU Cheng4
1 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2 Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China;
3 Tanzania Fisheries Research Institute-Kigoma Centre, Kigoma P. O. Box 90, Tanzania;
4 School of Environmental Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China
Abstract:
The vertical distributions of trace metals and physicochemical parameters in water columns in Kigoma Bay and Kungwe Bay in eastern Lake Tanganyika, Tanzania, were studied. The Al, Ba, Ca, Co, K, Mg, Mn, Mo, Na, Sn, Sr, and V concentrations were low and varied very little with depth. The toxic heavy metal (As, Cr, Cu, Ni, Pb, and Zn) concentrations were relatively high in the surface water, and the Cu, Ni, Pb, and Zn concentrations decreased with depth. Principal component and cluster analyses indicated that the metals in the lake had three main sources. Al, Ba, Ca, Co, Cu, Cr, Mn, Sr, Sn, and V were found to be geogenic; As, Cr, Cu, Mo, Ni, Pb, Sn and Zn anthropogenic; and As, Ca, Co, Mg, and Na biogenic. Human health risk assessments were performed, and it was found that trace metals in the water at most of the sampling sites would cause no potential adverse effects or non-carcinogenic health risks through dermal contact or ingestion. However, trace metals in surface water in Kungwe Bay could have certain adverse effects on human health through the ingestion pathway (the total hazard quotient for ingestion (ΣHQing) was 1.75 (a value >1 was defined as possibly indicating adverse effects). The Pb HQing for surface water in Kungwe Bay was 1.50 and contributed >80% of the ΣHQing, implying that Pb pollution is a water quality and safety problem that needs to be carefully monitored and the potential sources identified.
Key words:    trace metal|heavy metal|risk assessment|water column|Lake Tanganyika   
Received: 2017-11-29   Revised: 2018-02-02
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Articles by SHEN Qiushi
Articles by ZHANG Lu
Articles by Ismael Aaron KIMIREI
Articles by WANG Zhaode
Articles by GAO Qun
Articles by CHEN Shuang
Articles by YU Cheng
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