1. The large number of acid groups in the presence of phosphorus, and calcium phosphate precipitate may be generated. However, this newly formed precipitate can still dissolve for EDTA in a short time and with sufficient agitation, so the placement time should not be too long, otherwise the result will be low. 2. high sample containing magnesium, adding a base before the volume of the solution should be diluted to 80-150ml, alkalinity control PH12.5 appropriate to reduce the absorption of magnesium hydroxide was added dropwise to the calcium magnesium result of increased . 3. When the starch contains calcium and magnesium, the use should be added quantitatively. 4. The sample presence of heavy metals, the need to add sodium cyanide masked titration.
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