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在测试液中加入Ｋ_２ＣｒＯ_４和乙醇，提高Ｂａ~（２＋）对滴定终点指示的灵敏度，用示波双电位滴定法直接测定了多种天然水样中的，方法简便，结果可靠。
K 2 CrO 4 and ethanol are added to the test solution to improve the sensitivity of Ba 2+ to the endpoint indication of the titration. The method of oscillometric bipotentiometry is used to directly determine a variety of natural water samples, and the method is simple and reliable.