The iron content determination method provided in GB/T 320-2006 Synthetic hydrochloric acid for industrial use can no longer meet production requirements.The authors redesigned the standard curve for determining iron mass fraction,adjusted the mass concentration of the iron standard solution from 0.01 g/L to 2 μ g/mL,and changed the specification of the colorimetric dish.The improved method increased the accuracy and precision of the determination.
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