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• Effect of (a) NaBH₄ concentration, (b) NaBH₄ flow rate, (c) hydrochloric acid flow rate, (d) nebulizer flow rate, (e) plasma viewing distance, and (f) RF power (Fig. S1). The effect of sonication time on the oxidation of 1.0 mg l⁻¹ As(III) prepared in (a) deionized water, (b) 0.01 mol l⁻¹ NaOH and (c) 0.01 mol l⁻¹ H₃PO₄ (Fig. S2)
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