Speciation and Seasonal Variations of Dissolved Inorganic Arsenic in Jiaozhou Bay,North China |
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Authors: | J L Ren J Zhang D D Li Y Cheng S M Liu |
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Institution: | (1) Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 238 Songling Road, Qingdao, 266100, People’s Republic of China;(2) State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai, 200062, People’s Republic of China |
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Abstract: | The distributions and biogeochemical cycles of arsenic in the aquatic environment have captured the interest of geochemists
due to arsenic’s multiple chemical forms, the toxicity of certain arsenic species and large anthropogenic input. Seasonal
variations in the dissolved inorganic arsenic concentration and speciation in Jiaozhou Bay, which is located on the west coast
of the Yellow Sea in northern China, are presented here. Three cruises were carried out in Jiaozhou Bay under varying tidal
regimes, one at neap tide and one at spring tide in August and one at spring tide in October of 2001. In addition to the transect
surveys, the main sources of dissolved inorganic arsenate and arsenite in Jiaozhou Bay, including riverine input from five
major tributary rivers, atmospheric dry and wet depositions, and groundwater and wastewater input, were collected in different
seasons to estimate arsenic transport through different sources. The mean concentrations of total dissolved inorganic arsenic
(TDIAs, As (V+III)) in Jiaozhou Bay were statistically comparable between summer and autumn, with higher concentrations at
the northwest and northeast parts of the bay, reflecting human activities. The As (III)/TDIAs ratio ranged between 0.045 and
0.68, with an average of 0.16, implying that arsenate was the dominating species in Jiaozhou Bay. A preliminary box model
was established to estimate the water-mass balance and arsenic budgets for Jiaozhou Bay, which demonstrated that river inputs
and atmospheric depositions were the main sources of arsenic into Jiaozhou Bay. The concentrations of dissolved inorganic
arsenic in Jiaozhou Bay have decreased in the last two decades. Compared with other areas in the world, the concentration
of arsenic in Jiaozhou Bay remains at the natural level and this region can be characterized as a less disturbed area. |
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Keywords: | Arsenic Speciation Jiaozhou Bay Seasonal variation |
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