Comparisons of sediment mass accumulation rates in different regions of Dongting Lake and their environmental indications: Based on Pu, Cs, and Pb.

In this study, 24 sediment cores collected from Dongting Lake were detected by inductively coupled plasma-mass spectrometry and HPGe γ-spectrometer for Pu, Cs, Ra, and Pb, respectively. Based on the vertical profiles of Pb, Pu, and Cs, sediment mass accumulation rates (MAR) were calculated, and the responses to major environmental events and anthropogenic activities were discussed. The vertical profiles of Cs and Pu exhibit bimodal distribution, the secondary peaks most probably indicated the fallout from a series of Chinese nuclear tests (CNT) during the 1970s.

Distribution of heavy metals and radionuclides in the sediments and their environmental impacts in Nansha Sea area, South China Sea.

Activity concentrations of radionuclides (U, Ra, Th, and K) in the sediments of eight sampling stations and heavy metal concentrations (Cr, Co, Ni, Cu, Zn, As, Cd, and Pb) in the sediments of two long cores from Nansha Sea area were obtained by high-purity germanium spectroscopy and inductively coupled plasma atomic emission spectrometry. In a correlation analysis between the radionuclides and heavy metals, Th was positively correlated with As and Pb. U demonstrated a significant positive correlation with Co, Ni, Cu, Zn, and Cd.

Wet depositional fluxes of Be and Pb and their influencing factors at two characteristic cities of China.

The atmospheric depositional fluxes of Be and Pb in Yueyang and Hengyang were measured by the γ spectrum analysis method and their influencing factors were discussed. Results are summarized as follows: the variation ranges and average values of Be depositional fluxes are very close to each other in the two characteristic sampling regions, but not for Pb. In the same sampling region, there is a strong positive linear correlation between the depositional fluxes of two nuclides and their monthly variations are synchronous.

Synthesis of molybdenum disulfide/reduced graphene oxide composites for effective removal of Pb(II) from aqueous solutions.

In this work, a facile method was adopted to synthesize molybdenum disulfide/reduced graphene oxide (MoS/rGO) composites through an l-cysteine-assisted hydrothermal technique. The as-prepared MoS/rGO composites were firstly applied as adsorbents for efficient elimination of Pb(II) ions. Batch adsorption experiments showed that the adsorption of Pb(II) on MoS/rGO followed pseudo-second-order kinetic model well.