I have a question regarding the testing of zinc sulfate
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In the national standard for zinc sulfate, 200 g/L of ammonium fluoride is used in the determination of the main content of zinc sulfate; can sodium fluoride or potassium fluoride be used as a substitute? If a substitute can be used, what concentration would be appropriate?
No, ammonium fluoride is added to eliminate the influence of metal ions such as copper and iron in zinc sulfate products on the color-developing agent; sodium fluoride or potassium fluoride contain metal ions themselves, which may affect the detection results.