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Research argued that daily excessive concentration hours (DECH) could be more informative through accounting for within-day variations, when assessing population-level exposure to ambient fine particle (PM 2.5 ). However, few studies have comparatively investigated PM 2.5 -associated risks using DECH and two common metrics of daily mean and hourly peak concentration.We collected daily records of all-cause...
Nonylphenol polyethoxylates (NPnEO) and nonylphenol (NP) have provoked much environmental concern because of their weak estrogenic activities. We monitored NPnEO and their metabolites in rivers in Tianjin and in a sewage treatment plant of Tianjin monthly for 1year. The total concentrations of NPnEO and NP in influent, up to 47.2μgL −1 in August, were higher in summer than in other seasons...
Fourteen surface sediment samples were collected from Lanzhou Reach of Yellow River, China in July 2005. The concentrations of 16 priority polycyclic aromatic hydrocarbons (PAHs) were determined by gas chromatography equipped with a mass spectrometry detector (GC–MS). Total concentrations of the PAHs ranged from 464 to 2621ng/g dry weight. Sediment samples with the highest PAH concentrations appeared...
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