A 42-year-old industrial worker in Mumbai is admitted with confusion, headache, and a fruity-smelling breath. Laboratory findings show pH 7.10, HCO₃⁻ 10 mEq/L, and osmolal gap of 12 mOsm/kg. Serum ethanol is undetectable. Which investigation is most appropriate to differentiate between methanol and ethylene glycol poisoning?

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