Road maintenance in winter using de-icing agents, which is widely used in Eastern Europe, is the cause of water salinization in neighbouring environments, which might lead to biodiversity loss in aquatic ecosystems. In this study, we investigated NaCl toxicity to test young organisms: Daphnia magna and Poecilla reticulata (standard tests organisms). The salinity of NaCl was measured by electrolytic conductivity (EC). It was statistically demonstrated that the test solutions should be prepared using natural water. For D. magna the NOEC was 7.17 mS/cm and the LC50 9.76 mS/cm. Poecilla reticulata showed resistance to salinity up to a conductivity of 25.2 mS/cm, and no lethal effects were recorded for any individual in the test population. The study showed that winter salinities recorded in inland waters (without emergencies such as sudden influx of pollutants due to industrial accidents) are unlikely to affect fish but may be hazardous to small plankton. However, the high dare of D. magna may result in a reduction of planktivorous fish.

中文翻译：

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冬季道路除冰会影响水生生态系统中生物的死亡率吗？实验方法

冬季使用在东欧广泛使用的除冰剂进行道路维护是导致邻近环境水盐碱化的原因，这可能导致水生生态系统的生物多样性丧失。在这项研究中，我们调查了 NaCl 的毒性以测试年轻生物：Daphnia magna和Poecilla reticulata（标准测试生物）。NaCl 的盐度通过电解电导率 (EC) 测量。统计表明，应使用天然水制备测试溶液。对于D. magna，NOEC 为 7.17 mS/cm，LC50 为 9.76 mS/cm。柳树显示出对盐度的抵抗力高达 25.2 mS/cm 的电导率，并且在测试人群中没有记录到对任何个体的致命影响。研究表明，内陆水域记录的冬季盐度（没有工业事故导致污染物突然流入等紧急情况）不太可能影响鱼类，但可能对小型浮游生物有害。然而，D. magna的高胆量可能会导致浮游鱼类的减少。