Study of the Effect of pH on the Toxicity and Bioaccumulation of Cadmium on Beans [Phaseolus Vulgaris]

Abstract

Abstract-The behavior of many metallic trace metals is often affected by several factors, among them pH which plays a crucial role in the transport, distribution, uptake, solubility, bioavailability and bioaccumulation of ETM in plants from soils as reported by many authors. This study was conducted to elucidate the effect of pH on the toxicity of cadmium on beans (Phaseolus Vulgaris) with the main objective to reveal the response of bean plants at different pH values to different added concentrations of Cd 2+ . The results revealed that the growth of beans increased with increasing pH. However, the uptake and the accumulation of cadmium decreased. Generally, it appears from the obtained results that the metals tested exert more toxic effect in acidic than in alkaline pH conditions.

Using Calcicolous and Corticolous Lichens to Assess Lead and Cadmium Air Pollution of the Moroccan Atlantic Coast Safi-Essaouira

“…The unavailability of studies linking possible influence of the support on the bioaccumulation of Cd by lichens suggests the hypothesis of the influence of the support pH. The model of higher plants shows that Cd has a more toxic effect under acidic than alkaline pH conditions [54][55]. It can be hypothesized that the alkaline character of the calcareous support for calcicolous forms (X. calcicola and R. pollinaria) reduces the toxicity of cadmium, while the relatively acidic character of the porophyte bark of the corticolous forms (X. parietina and R. lacera) facilitates Cd bioaccumulation.…”