口腔综合治疗台水路污染精准消毒管理的效果观察

目的 分析口腔综合治疗台水路污染精准消毒管理的效果,旨在提高其微生物的检出合格率.方法 对3台西诺德Intego口腔综合治疗台进行微生物检测,其中以2018年1～6月随机采集工作状态下的54份口腔诊疗用水设为对照组,以2018年7～12月采集的54份口腔诊疗用水设为观察组.对照组在医院常规管理模式下采集水样检查,观察组...     

Comparison of the relative sensitivity of three benthic invertebrates to copper-contaminated sediments from the Keweenaw Waterway

The Keweenaw Peninsula in northern Michigan was once a major copper mining area and these mining activities were responsible for depositing tons of tailings in and around the Keweenaw Waterway. In recent years there has been concern about possible toxic effects of the contaminated sediments on aquatic communities in the system. In the fall of 1990, sediments were collected from various locations along the Waterway. Ten-day tests were conducted with the samples using three species of benthic invertebrates that have been proposed as suitable for evaluating the toxicity of freshwater sediments: Hyalella azteca (amphipods), Chironomus tentans (chironomids) and Lumbriculus variegatus(oligochaetes). A number of sediments were toxic to one or more of the three species and, in general, there was good agreement among the tests with regard to identifying toxic samples. Unexpectedly, the relative sensitivity of the three species to the test sediments was not accurately predicted from water-only copper exposures. This indicates that factors modifying exposure, such as different lifestyles and/or varying sensitivity to physico-chemical characteristics of sediments can influence results of sediment toxicity tests.