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Determination of toxicity to an invertebrate population.
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Determination of Toxicity to an Invertebrate Population Aim The aim of this experiment is to observe how increasing concentrations of copper (II) sulphate pentahydrate solution affect the mortality of Daphnia (freshwater zooplankton). Introduction Toxicity is deemed to mean 'the inherent poisonous potency of a substance' (lecture notes). Freshwater pollutants are extremely diverse and are described by Jeffries and Mills (1990, p135) as "anything in the wrong place, in damaging quantities". Toxic pollutants cover a wide range of substances, substances that have no normal place in natural systems and many of which are man made (Jeffries & Mills, 1990). These pollutants include metals, organic compounds, gases, anions, radioactive material and acids and alkalis and can enter freshwater systems by means of domestic, industrial or agricultural effluents. Metals are often leached from mineworkings (Mason, 1991). Toxicity has been described to have two main effects on living organisms, acute toxicity, which has been defined as a dose...
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