• 溶解氧（DO） ： 指溶解在水体中的氧气含量，单位为mg/L，是反映水体自净能力和水生 生态状况的关键指标。水体中溶解氧含量越高，说明水体自净能力越强；若溶解氧过低（如低 于5mg/L），会导致水生生物缺氧死亡，引发水体黑臭等污染问题。 • 浊度 ： 表 征 水 体 中 悬 浮 颗 粒 物 、 胶 体 物 质 等 浑 浊 程 度 的 指 标 ， 单 位 为 NTU （ 散 射 浊 度 单 位），反映水体的透明程度。浊度过高不仅影响水生植物的光合作用，还会吸附污染物，降低 水体净化能力，同时影响饮用水处理成本。 • 电导率 ： 衡量水体中电解质含量的指标，单位为S/m，反映水体中溶解的离子浓度。电导 率越高，说明水体中可溶性盐类、重金属离子等电解质含量越高，可间接判断水体受污染程度 （如工业废水排放会导致电导率显著升高）。 摘要 ：仪器信息网根据中国环境监测总站发布的《水质类仪器适用性检测合格名录》进行梳理，其中适 用性检测合格名录中共计95家生产厂商的115台（套）水质多参数自动监测系统入选。 特别提示 微信机制调整，点击顶部"仪器信息网" → 右上方"…" → 设为 ★ 星标，否则很可能无法看到我 们的 ...

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Core Viewpoint - The water quality of Baiyangdian has significantly improved from a grade of inferior V to a stable grade III, indicating successful ecological restoration efforts in the region [2][4]. Group 1: Water Quality Improvement - Baiyangdian's water quality was previously classified as inferior V, characterized by deep green, turbid water with an unpleasant odor [2]. - Following the establishment of the Xiong'an New Area in 2017, systematic ecological protection measures were implemented, leading to a rise in water quality to grade III, which has been stable since 2021 [3][4]. - The number of national monitoring points increased from 5 to 8, with sampling frequency raised to twice a week, enhancing the ability to detect and address water quality issues promptly [2][3]. Group 2: Biodiversity Recovery - The ecological recovery has led to an increase in wild bird species in Baiyangdian to 296, up by 90 species since the establishment of the Xiong'an New Area [4]. - The number of wild fish species has also risen to 48, an increase of 21 species compared to before the establishment of the new area [4]. - The discovery of the May Fourth midge, a typical indicator species for clean water, signifies ongoing improvements in the water ecosystem [4]. Group 3: Monitoring and Efforts - The monitoring team has faced challenges such as personnel shortages and outdated equipment, but recent upgrades have significantly improved efficiency, allowing for quicker analysis of water samples [3][5]. - Continuous efforts by dedicated environmental workers, like Liu Dongmei, have been crucial in documenting and supporting the water quality improvement process [5].