Simultaneous Determination of Heavy Metals in Competitive Aqueous Solutions and Contaminated Soil Systems

2022

English

Often times, errors and unreliable results arise from the analytical instruments employed. In this study, Potentiometric Stripping Analysis (PSA) was used to quantify heavy metals in a competitive aqueous solution containing Spirulina platensis— Spirulina maxima cells containing heavy metals due to the following advantages; higher sensitivity, lower detection limits, simultaneous multielement detection, accuracy, fast, suitability for on-line and in-situ measurements and cost-effectiveness. Electrochemical and chemical parameters were optimized for efficient deposition and stripping steps. Measured data were fitted onto Langmuir and Freundlich isotherms which demonstrated the best fit for the Langmuir isotherm where RL=0.963067 and R2= 0.99901 whereas the data less fitted the Freundlich isotherm with 1/n = 1.024391 and R2 = 0.98735. Linear logarithm and stripping relationship were thus achieved as follows; 3.12 × 10 to 4.20 × 107 cfu mL−1, 2.67 × 10 to 2.3 × 107 cfu mL−1, 1.31 × 10 to 2.10 × 107 cfu mL−1 for Cu2+, Zn2+ and Pb2+ respectively. Phytoavailability test on complex soil from mining areas was also performed. The physical and chemical properties are responsible for the non-phytoavailabilty of Cr and As in these soils. Potentiometric Stripping Analysis and Atomic Absorption Spectroscopy results have been compared.

Anemana, T.; Osei, O.; Yeboah, E.; Pekar, M.