High sensitivity atomic fluorescence spectroscopy for the detection of As by selective electrolysis of arsenic on nanoflowers-like Fe/NFE.

Modified electrosynthetic sample introduction technique is a reliable means of solving the problem of high sensitivity analysis of trace arsenite. This article attempts to achieve selective electroreduction of As through the construction of electrode surfaces with different structures and materials from the perspective of interface reactions. Among the four transition metal modifiers, the iron modified nickel foam electrode with nano-flower structure documented higher efficiency in inducing arsenic reduction and better species selectivity. Systematic electrochemical and spectroscopic tests suggest that strong adsorption effect between Fe and As, appropriate hydrogen evolution potential, and catalytic activity jointly promote efficient electroreduction of As. Optimization based on electrode materials and electrolysis conditions, with high sensitivity, wide linear range (0.1-50 μg L), and excellent species selectivity, this paper offers an efficient and economic sample introduction method for trace As selective atomic spectroscopy direct determination.