Research development of endocrine disrupting chemicals (EDCs) in water in China.
More and more importance has been attached to the problem of endocrine disrupting chemicals (EDCs) since 1960s. This article elaborates the recent research progress of EDCs in water and the trends in the near future in China.
Mutation Effect of Alkyl-hydroxybenzene
The mutation toxicity of the environmental potential endocrine disturbances Alkyl\|hydroxybenzenes has been investigated with Ames test by using the TA97,TA98,TA100 and TA102.The result shows that,except the 2,4-dichlorphenol,the test chemicals such as dimethylphenol,p\|ethylphenol,4\|octanylphenol,nonylphenol,and some chlorophenols have positive responses on the TA98,and the main type of gene mutation is base\|pair frame\|shift.
On-line sample handling strategies for the trace-level determination of pesticides and their degradation products in environmental waters
An overview of the use of on-line techniques is presented. First, it includes the on-line coupling of solid-phase extraction and liquid chromatography, which is certainly the most commonly used automated technique really well adapted to the multiresidue analysis of pesticides in aqueous samples. The different parameters which govern the method (dimension of the pre-columns, type of sorbents, pre-columns in series, quantitative analysis) are discussed and applications to various waters are presented. Emphasis is given to the limits of detection obtained using UV diode array, fluorescence or electrochemical detection modes. The on-line post-column reaction detection coupled to liquid chromatography are also reviewed with emphasis on the determination of N-methylcarbamates. The performances of the on-line mass spectrometric detection coupled to solid-phase extraction and liquid chromatography are presented using thermospray, particle beam or electrospray. The main characteristics of the on-line coupling of solid-phase extraction and gas chromatography are also given, with various applications and corresponding detection limits. The recent results obtained with the on-line coupling of gas chromatography with solid-phase micro-extraction are outlined. Supercritical fluid extraction is also mentioned as a new sample handling technique which can be easily on-line coupled to the Chromatographic separation.