Spatial distribution and correlation characteristics of heavy metals in the seawater, suspended particulate matter and sediments in Zhanjiang Bay, China

Abstract

Concentrations of eight heavy metals (i.e., Fe, Mn, Cr, Ni, Cu, Zn, Cd and Pb) in the seawater, suspended particulate matter (SPM) and sediments of the Zhanjiang Bay were investigated in 2014. The concentrations of metals were generally low in the seawater and sediments of the Zhanjiang Bay in winter and summer, indicating good environmental quality in the bay. The distribution patterns of Fe and Mn in three phases indicated the influence of terrestrial inputs. The partition coefficients log(Kd) between the dissolved and particulate phases showed a general decrease in the order of Pb≈Cd>Fe≈Mn>Ni≈Cr>Zn>Cu. The concentrations of some metals in the dissolved and particulate phases showed seasonal variations. Phytoplankton production and complexation reactions may contribute to this phenomenon. The relationships among metals in different phases were different, and there were few close relationships among metals in the dissolved phase, many close relationships in the particulate phase, and more close relationships in the sedimentary phase. This finding may be related to the different mobility levels of metals in different phases.

Assessing Seasonal Nitrate Contamination by Nitrate Dual Isotopes in a Monsoon-Controlled Bay with Intensive Human Activities in South China

“…In addition, biological processes such as assimilation and denitrification can cause isotope fractionation owing to preferential uptake of lighter isotopes ( 14 N and 16 O) [9,13]. During phytoplankton assimilation and denitrification, the enrichment of isotope values with a 15 N/ 14 N: 18 O/ 16 O ratio ( 18 ε: 15 ε) of 1 occurs [12,13,16]. Nitrification results in the formation of 15 N-depleted NO 3 − , and remineralization of sinking organic N produced by N 2 fixation results in an increase in the proportion of light N in seawater [14].…”

“…Zhanjiang Bay is a closed bay with intensive human activities in South China. Recently, high loads of inorganic N and phosphate (PO 4 3− ) were found in the seawater of Zhanjiang Bay, owing to the rapid economic growth and urban development in the surrounding area [18]. Clear spatial and seasonal variations in the degree of eutrophication were previously reported in Zhanjiang Bay [19].…”

“…This suggested that the seaward decrease in nutrient concentrations was not mainly affected by phytoplankton assimilation, but instead, more likely affected by dilution with the outer seawater. However, relatively high δ18 O-NO 3…”

Distribusi Spasial Logam Berat Besi (Fe) di Perairan Teluk Staring, Sulawesi Tenggara

“…Dalam studi ini, metode interpolasi diterapkan pada analisis spasial logam Fe di perairan Teluk Staring. Penetapan logam Fe disebabkan karena logam Fe merupakan unsur yang dapat ditemui pada hampir setiap tempat di bumi, pada semua lapisan geologis dan semua badan air, bioakumulatif, sering dijumpai telah melewati standar baku mutu logam Fe untuk wilayah perairan teluk [8,9,10]. Studi analisis spasial dan faktor kontaminasi logam Fe dalam sistem perairan Teluk Staring sangat penting untuk dilakukan mengingat banyak sumber input yang berpotensi menimbulkan pencemaran logam Fe.…”

Effects of seasonal variations and pond age on trace elements and their correlations with plankton productivity in commercial freshwater crayfish ( cherax cainii austin, 2002) earthen ponds

“…In the aquatic environment, trace elements are added via natural processes such as precipitation input, soil degradation, rock disintegration, atmospheric deposition and anthropogenic activities such as mining, urban, agricultural and industrial activities (Ahmed, Bibi, Fukushima, Seto, & Ishiga, 2011;Arain et al, 2008;Khatri & Tyagi, 2015;Reimer, 1999). Many aquatic organisms assimilate dissolved trace elements directly from the environment (Zhang et al, 2018), including phytoplankton (Baeyens, Elskens, Gillain, & Goeyens, 1998;Hassler, Slaveykova, & Wilkison, 2004), while zooplankton can acquire them through aqueous and dietary ingestion (Yu & Wang, 2002).…”