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采用ＥＤＴＡ滴定法测定珍珠母中ＣａＣＯ３的含量，来考察珍珠母煎煮时的最佳用量、粉碎度和煎煮时间。结果表明：珍珠母用量以不超过２０～２５ｇ为宜，煎煮时粉碎度愈大愈好，煎煮最佳时间以４０ｍｉｎ为宜。
The EDTA titration method was used to determine the content of CaCO3 in mother-of-pearl and to determine the optimum dosage, comminuted degree and decoction time of the mother-of-pearl decoction. The results showed that the amount of mother-of-pearl was not more than 20-25 g, and the larger the grinding degree was, the better the boiling time was. The best time for boiling was 40 minutes.