Abstract Rock-derived or petrogenic organic carbon has traditionally been regarded as being non-bioavailable and bypassing the active cycle when eroded. However, it become apparent that this might not be so inert, especially in fjord systems where influxes can high, making its degradation another potential source of greenhouse gas emissions. The extent to which subsurface micro-organisms use is...

Abstract Heavy rare earth elements (HREEs) in mafic and ultramafic volcanic rocks are useful recorders of mantle source processes because their ratios not easily modified by differentiation. Here we utilize REEBOX PRO, a simulator adiabatic decompression melting the mantle, to study behavior HREEs formation continental flood basalt (CFB) parental magmas mantle. We simulate partial depleted peri...

Polycyclic aromatic hydrocarbons (PAHs) are natural, ubiquitous substances in marine environments; they consist of two or more benzene rings fused in various arrangements. A range of biological effects has been demonstrated for these compounds, including acute toxicity, carcinogenicity, mutagenicity, teratogenicity and endocrine disrupting activity (Takeuchi et al., 2009). There are two types o...

polycyclic aromatic hydrocarbons (pahs) in the priority controlling list of us epa weresystematically evaluated in surface sediments in dianchi lake and its estuaries. total pah concentrations(σpahs) varied from 210 to 11,070 ng/g dry weight (d.w.) in dianchi lake, and from 230 to 12,271 ng/g d.w.in the estuaries. σpahs in sediments from caohai section were higher than those from waihai section...

We applied cluster analysis and principal component analysis (PCA) with multivariate linear regression (MLR) to apportion sources of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of the Huangpu River in Shanghai, China, based on the measured PAH concentrations of 32 samples collected at eight sites in four seasons in 2006. The results indicate that petrogenic and pyrogenic source...