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介绍利用玻璃坩埚过滤ＢａＳＯ４沉淀，微波加热恒重，测定磷矿石、湿法磷酸及合成标样中的ＳＯ４２－，利用提高酸度和一次性加入 ＢａＣｌ２溶液减少干扰离子的共沉淀现象。通过试验确定了微波恒重时间 ４５ ｍｉｎ即可，并推荐磷矿试样采用酸溶分解法，好于熔融法。
Introduce the use of glass crucible filter BaSO4 precipitation, constant temperature microwave heating, determination of phosphate rock, wet phosphoric acid and synthetic standard samples of SO42-, using a one-time increase BaCl2 solution to reduce the coprecipitation of interfering ions. Through experiment, the constant time of microwave can be determined for 45 min, and it is recommended that the phosphate rock sample is treated by acid dissolution method, which is better than the melting method.