Phosphorus biogeochemical cycling in intertidal surface sediments from the Maowei Sea in the northern Beibu Gulf

Abstract Freshwater contaminants tend to precipitate into intertidal surface sediments, particularly in the estuary and intertidal zones during freshwater–seawater mixing. Quinolone-type antibiotics are such contaminants, and their concentrations in the intertidal sediments are important indicators for the whole spectrum of antibiotics used in the estuary and adjacent areas. The impacts of sediment types and environmental factors on the distribution of 16 quinolones were probed based on nine Bohai and 42 Yellow Sea intertidal sediment samples. The samples were collected from locations along the coastal areas in China. Quinolones were detected in all samples, while moxifloxacin, ciprofloxacin, and ofloxacin were detected at a frequency >50%. Sediment types, pH, organic carbon content, K, Na and Fe concentrations had little correlation with quinolone distributions in intertidal sediments. However, combined concentrations of Ca + Mg (46.7 g/kg in Bohai and 13.7 g/kg in Yellow Sea samples) appeared to correlate with oxolinic acid detecting frequencies (88.9% and 4.8%, respectively) and concentrations (2.0–10.1 μg/g and up to 3.09 μg/g, respectively). Different detection frequencies of the quinolones could be attributed to the formation of cation bridges between oxolinic acid and Ca + Mg, which results in dominant sorption of oxolinic acid at different locations and sediment matrices.

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Iron and Arsenic Cycling in Intertidal Surface Sediments during Wetland Remediation

Environmental Science & Technology ◽

10.1021/es103403n ◽

2011 ◽

Vol 45 (6) ◽

pp. 2179-2185 ◽

Cited By ~ 46

Author(s):

Scott G. Johnston ◽

Annabelle F. Keene ◽

Edward D. Burton ◽

Richard T. Bush ◽

Leigh A. Sullivan

Keyword(s):

Surface Sediments ◽

Intertidal Surface

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Contents and Distributions of Heavy Metals in the Surface Sediments from Northern Beibu Gulf

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.1194 ◽

2012 ◽

Vol 610-613 ◽

pp. 1194-1198

Author(s):

Yue Han Li ◽

Ai Rong Zheng ◽

Zhi Kai Ma

Keyword(s):

Heavy Metals ◽

Atomic Absorption ◽

Coastal Area ◽

Surface Sediments ◽

Depositional Environments ◽

Atomic Absorption Spectrophotometer ◽

Beibu Gulf ◽

Offshore Area ◽

Organic Matters ◽

Terrestrial Inputs

Contents and distributions of heavy metals in surface sediments from the northern Beibu Gulf were analyzed using atomic absorption spectrophotometer. The results showed that the contents of Cu, Pb, Zn, Cr and Cd were 14.22～26.68, 31.85～54.59, 60.19～90.93, 29.95～67.95 and 0.030～0.130 µg•g–1, respectively, and average were 18.21, 38.88, 78.00, 48.46 and 0.09µg•g–1. The reducing environments in northern Beibu Gulf were attributed to organic matters and sulfide. The distributions of heavy metals showed the trend of higher along the coastal area and lower in the offshore area, generally controlled by terrestrial inputs, as well as hydrological conditions, depositional environments and so on.

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