In order to evaluate the long-term (30-day) influence of nickel on biomass of periphyton communities, indoor artificial streams were used with differing nickel concentration (2.5, 5, and 7.5 mg/l). Physical and chemical factors (pH, NO3-N, PO4-P, dissolved oxygen, total suspended solids, conductivity, total dissolved solids, biochemical oxygen demand, and chemical oxygen demand) were measured along with biological properties of the periphyton. The effects of nickel on periphyton communities were assessed by measuring dry mass, ash-free dry mass (AFDM), chlorophyll-a, and rate of nickel absorption. In artificial streams with nickel, there was a significant (P < 0.05) reduction of chlorophyll-a, AFDM, and dry mass under the influence of nickel. These observations suggest that the periphyton community could serve as an indicator of nickel pollution.
- artificial stream
- First received 3 August 2014.
- Accepted in revised form 19 May 2015.
- © IWA Publishing 2015