Nature & Environment
Effects of pollutants on the aquatic environment
...Table 1. Table 1 Oral toxicities of some chemicals in small mammals LD50 (mg per kg body weight) Examples Classification 1–10 arsenic highly toxic 10–100 cadmium copper lead mercury moderately toxic 100–1000 aluminium molybdenum zinc slightly toxic >1000 sodium iodine calcium potassium relatively harmless Certain inorganic substances, such as cyanides, fluorides,...