Zinc bioavailability to aquatic organisms varies greatly under different pH values. In the present study, five native species in China and four common international test species were selected to investigate the influence of changing pH on acute zinc toxicity. The results showed that the higher trophic levels exhibited increasing sensitivity to zinc as pH decreased. However, when the pH value was between 8 and 11, the acute toxicity of zinc was relatively constant. In addition, by using a species-sensitivity distribution (SSD) method, the short-term hazardous concentrations of zinc at different pH values (based on the 5th percentiles of the pH-specific SSDs) were determined to be 17.26 µg/L (pH 4), 48.31 µg/L (pH 5), 80.34 µg/L (pH 6) and 230.6 µg/L (pH 7), respectively. The present study provides useful information for deriving water quality criteria and assessing the risks of metals in the near future. Electronic supplementary material The online version of this article (10.1007/s00128-018-2441-2) contains supplementary material, which is available to authorized users.
As an important source of domestic water and drinking water, the groundwater quality is crucial. Reasonable screening of typical groundwater pollutants is crucial for studying groundwater quality. At present, most research in Linyi focus on the distribution and utilization of water resources, few research focuses on groundwater quality. Therefore, this paper introduces a method of screening priority pollutants, that is, the screening method based on pollution assessment. This method can help to clarify research priorities and make targeted recommendations. In this paper, the study area is a Development Zone of Linyi. Based on groundwater monitoring data of November 2012 and November 2017, a screening method of groundwater priority control pollutants based on pollution assessment is applied to screen out typical pollutants of shallow groundwater quality. It will provide reference for future managements and planning of groundwater in the Development Zone. After pollutants screening and assignment calculation, the results show that the typical pollutants in groundwater are nitrite, anionic surfactant, ammonia nitrogen, fluoride, sodium, nitrate, permanganate index, sulfate, chloride, total hardness, total dissolved solids.
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