Effect of Bi(iii)-to-metal ion concentration ratios on stripping voltammetric response of bismuth-film glassy carbon electrodes.

The effect of Bi-to-metal ion concentration ratio ( / ratio) on key evaluation indicators, including sensitivity, precision, and cathodic potential range, has been investigated for the determination of Cd and Pb at prepared bismuth film electrodes. Unlike the usual recommendation of at least a 10-fold excess of Hg(ii) for anodic stripping experiments at prepared mercury film electrodes, it is found that the / ratios in the 1-10 range are sufficient to obtain a high determination sensitivity, but that the signal decreases significantly when the ratio exceeds 40. Further analysis shows that the precision of the analytical results is good when the / ratio is in the range of 5-10.

Health risks posed to infants in rural China by exposure to short- and medium-chain chlorinated paraffins in breast milk.

Chlorinated paraffins (CPs) are complex mixtures of synthetic chemicals found widely in environmental matrices. Short-chain CPs (SCCPs) are candidate persistent organic pollutants under the Stockholm Convention. There should be great concern about human exposure to SCCPs.

Human Exposure to Short- and Medium-Chain Chlorinated Paraffins via Mothers' Milk in Chinese Urban Population.

Chlorinated paraffins (CPs) are high production volume synthetic chemicals, found ubiquitously in various environmental matrices. However, little information is available on CP contamination in mothers' milk. In this study, 1370 urban mothers' milk samples were collected from 12 Chinese provinces in 2007 and 16 provinces in 2011.

A Novel Method for Profiling and Quantifying Short- and Medium-Chain Chlorinated Paraffins in Environmental Samples Using Comprehensive Two-Dimensional Gas Chromatography-Electron Capture Negative Ionization High-Resolution Time-of-Flight Mass Spectrometry.

Chlorinated paraffins (CPs) are complex technical mixtures containing thousands of isomers. Analyzing CPs in environmental matrices is extremely challenging. CPs have broad, unresolved profiles when analyzed by one-dimensional gas chromatography (GC).

[Pollution Characteristics and Risk Assessment of Polybrominated Diphenyl Ethers in the Surface Sediments from Middle Reaches of the Yangtze River].

Polybrominated diphenyl ethers (PBDEs) are highly lipophilic compounds with high toxicity and long-term bioaccumulation, which have strong affinities to suspended particulates in water. So PBDEs are easily adsorbed to sediments, and cause potential risks to human beings and aquatic ecosystem. In order to investigate the levels and patterns of PBDEs in the Yangtze River, 13 surface sediment samples were collected from the middle reaches of the regions and the concentrations of 9 PBDE congeners in the sediments were determined using High Resolution Gas Chromatography/High Resolution Mass Spectrometry (HRGC/HRMS).