Geochemistry of phosphorus in sediment cores from Sishili Bay, China

Separation and determination of colloidal trace metals in seawater by cross-flow ultrafiltration, liquid-liquid extraction and ICP-MS

“…S1). Site Y1 was located in the Sishili Bay, a busy region in the south coast of the NYS, which is greatly affected by aquaculture and human activities (Zhang et al, 2016); site Y2 was located in the Rongcheng Bay, a fast-growing aquaculture area, which was an important part of the Shandong Peninsula Blue Economic Zone in the national development strategy of China (Yang et al, 2001;Huang et al, 2013). Samples were collected in pre-cleaned polypropylene bottles that had been flushed in the field with seawater.…”

Colloidal toxic trace metals in urban riverine and estuarine waters of Yantai City, southern coast of North Yellow Sea

“…<1 kDa, 1-3 kDa, 3-10 kDa and 10 kDa-0.2 lm) in estuaries of the Guangdang River and the Xin'an River in the northern part of the Shandong Peninsula (Eastern China) is reported. The two rivers are located in typical Chinese coastal urban systems (Zhang et al, 2016), and occupy an important area of the Shandong Peninsula Blue Economic Zone which is integrated in the national development strategy (Huang et al, 2013). The originality of this work is the combined use of CUF, acid extraction and ICP-MS to separate and measure trace elements in colloidal/dissolved fractions along an estuarine salinity gradient.…”

Comparative Study on the Elucidation of Sedimentary Phosphorus Species Using Two Methods, the SMT and SEDEX Methods

“…Of this, Ex-P was composed of 14.85-43.19% TP, Fe-P was composed of 6.31%-31.50% of TP, and OP was composed of 2.51-12.86% of TP, indicating that these sediments could be released from the Ex-P and OP fractions by the decomposition of organic matter and from the Fe-P during anoxic conditions. In these study areas, the bioavailable P fraction elucidated by both methods was higher than in other locations, such as the East China Sea, which had 6-32% bioavailable P to TP [12,23]; Sishili Bay, China, which had 26.7-35.5% bioavailable P [15]; the eastern coast of Hainan Island, China, which had 20.3-54.2% bioavailable P [17]; the Caspian Sea, which had a mean of 37.2% bioavailable P [18]. us, based on the results of the present study, the Andong salt marsh and the Changjiang Estuary released P during the decomposition of organic matter and under anoxic conditions, which could be utilised by microorganisms.…”

“…It was also found that the labile P could have been released into the water because of the decomposition of organic matter during particle settling [14]. Similar studies found that the shellfish aquaculture did not cause significant changes in the sedimentary P species in Sishili Bay [15] but that seasonal variations caused changes in the sedimentary P species in the East China Sea [16]. e Ex-P, authigenic P, De-P, IP, and TP in the surface and core sediments of the eastern Hainan Island in the South China Sea were affected by particle size [17].…”

“…In our study areas, the surface sedimentary TP was lower compared to the TP in other locations that were elucidated using the SEDEX method. e results showed the following: TP from 416.5 to 638.5 mg/kg in the East China Sea sediment cores [25]; TP from 465 to 663.4 mg/kg in the Changjiang Estuary and adjacent East China Sea surface sediments [12]; TP from 474 to 1,035 mg/kg in the northern Gulf of Mexico sediment cores [13]; TP from 409.2 to 3,689 mg/kg in the central Pacific Ocean surface sediments [14]; TP of 466.24-669.29 mg/kg in the Sishili Bay, China [15], TP from 246.76 to 692.54 mg/kg at the eastern coast of Hainan Island surface sediment [17]; TP from 369.83 to 739.97 mg/kg in the East China Sea core sediments [26]; TP from 431 to 594 mg/ kg in the Caspian Sea surface sediments [18]. Similarly, in our study areas, the surface sedimentary TPs were lower compared to the sedimentary TPs in other locations elucidated using the SMT method: TP ranging from 520.8 to 1376.4 mg/kg in the Loire Estuary; from 130.2 to 787.4 mg/ kg in the Gironde Estuary; from 189.1 to 576.6 mg/kg in the Bay of Seine [19]; at 412.61 mg/kg in the Gulf of Gdańnsk [20]; from 217.8 to 1,640 mg/kg in the lakes in the mid and lower Changjiang River [27]; from 303.87 to 761.59 mg/kg in the subtropical wetland reserve in southeast China [21]; 87.28-2610.43 mg/kg in the main rivers discharging into the Bohai Sea [22].…”