Abstract
An analytical procedure regarding the trace determination of molybdenum in natural water samples by adsorptive stripping voltammetry (AdSV) using the in situ plated lead film electrode (PbFE) was described. The method is based on adsorptive accumulation of the Mo(VI)-cupferron complex at the PbFE surface. The optimum analytical conditions include the supporting electrolyte containing 0.2-mol L−1 acetic buffer pH = 5.3, 1.45 × 10−4-mol L−1 Pb(II), and 2.0 × 10−4-mol L−1cupferron. A linear response of Mo(VI) in the concentration range of 3.0 × 10−8 to 1.0 × 10−6 mol L−1 (r = 0.997) was obtained with detection limit of 9.0 × 10−9 mol L−1 using accumulation time of 50 s. The selectivity of the method was determined by investigating how the presence of foreign ions affects the determination of molybdenum. The interferences of surface-active substances and humic substances on the molybdenum voltammetric signal were precisely examined and effectively minimized by preliminary mixing with Amberlite XAD-7 resin. The application of the proposed procedure to the analysis of natural water samples was validated by the determination of molybdenum in certificate reference materials SPS-SW1 surface water, Bystrzyca river, tap, and mineral water.
Highlights
Molybdenum is a relatively rare heavy trace element found in the soil
Acetate buffer was widely used for the adsorptive stripping voltammetry metal determination using cupferron as a complexing agent [24, 25, 38,39,40]
The measurements were performed for the samples containing a constant concentration of Mo(VI) equal to 5.0 × 10−7 mol L−1, 2.0 × 10−4mol L−1cupferron, 1.45 × 10−4-mol L−1 Pb(II), and 0.2mol L−1 acetate buffer with different pH values
Summary
Molybdenum is a relatively rare heavy trace element found in the soil It belongs to essential microelements which play an important role in a variety of biochemical and physiological functions in plants, animals, and humans. To most metals required for plant growth, molybdenum is utilized by specific plant enzymes to participate in reduction and oxidation reactions. It takes part in the uptake of nitrogen from both nitrogen gas and nitrate [1, 2]. This element is an important constituent of several key enzymes and plays a major role in various oxidation-reduction reactions [3].
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