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. 2025 Aug 25;47(10):411. doi: 10.1007/s10653-025-02723-2

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© The Author(s) 2025

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Fig. 5 — Recovery of arsenic species (iAs, MMA, DMA) at different extraction durations and solid–liquid ratios. The solid–liquid ratios tested were 0.1 g SRM/10 mL HNO₃ and 1 g SRM/10 mL HNO₃, with extraction durations of 60, 90, and 120 min. The red dashed lines represent the acceptable recovery threshold range (70–120%). MMA recovery exceeded the acceptable range across all conditions