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Short-chain chlorinated paraffins (SCCPs) are a persistent organic pollutant, and limited information is available on their bioaccumulation and trophic transfer, which would be affected by carbon chain length, chlorine content, and hydrophobicity. In this study, relevant data on SCCPs in water, sediments, and organisms collected from Laizhou Bay were analyzed to investigate the specific distribution of SCCPs and their bioaccumulation and trophic transfer. In water and sediments, the average SCCP concentrations (ΣSCCPs) were 362.23 ± 81.03 ng/L and 609.68 ± 90.28 ng/g d.w., respectively. In 28 species of organisms, the ΣSCCPs varied from 70.05 to 47,244.13 ng/g l.w. (average = 648 ± 7360) and the predominant homologs were C13 (average = 34.91%) and Cl5–7 (average = 93.13%), differing from those in water (average = C11 32.75% and average = Cl5–7 88%) and sediments (average = C13 31.60% and average = Cl6–8 87.16%). The logarithm bioaccumulation factors (BAFs) of ΣSCCPs were 1.18–2.74 and were positively correlated with the log Kow. A significant negative linear relationship was observed between biota-sediment accumulation factors (BSAFs) and log Kow. It is suggested that the hydrophobicity may affect the bioaccumulation of SCCPs. SCCPs demonstrated a trophic magnification factor (TMF) ranging from 2.19 to 3.00 (average = 2.51) and exhibited a significant linear correlation with carbon chain length (p < 0.05) and log Kow values (p < 0.05), suggesting that SCCPs have biomagnification potential in Laizhou Bay that is affected by hydrophobicity and carbon chain length. [ABSTRACT FROM AUTHOR]

Porous CuO/CeO2 nanospheres are synthesized by a facile route, which involves a template-free solvothermal method to obtain porous CeO2 nanospheres, followed by a deposition–precipitation (DP) method of as-prepared porous CeO2 nanospheres and Cu(NO3)2 solution. XRD, TEM, SEM, ICP-MS, and EDS elemental mapping confirm that the obtained porous CuO/CeO2 nanospheres are composed of CeO2 nanospheres decorated with small particle size and well-dispersed CuO nanoparticles (NPs). Meanwhile, the activity of CO catalytic oxidation study is tested; porous CuO/CeO2 nanospheres exhibit signally higher activity than undecorated CeO2 nanospheres and solid CuO/CeO2 nanospheres at low temperature. The improved performance of porous CuO/CeO2 nanospheres is possibly ascribed to the synergetic effect and strong interaction between porous CeO2 nanospheres and decorated CuO NPs. [ABSTRACT FROM AUTHOR]