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[求助] 关于HPLC检测尿素,硝酸盐的存在导致峰分不开。求有经验的大佬解答,跪谢

请问一下,在采用HPLC(ODS-3 5 μm C18柱(150 mm × 4.6 mm,流动相为甲醇-水)检测尿素时,由于硝酸根和亚硝酸根离子的存在,导致峰始终分不开。之前尝试过调节流动相的比例和流速,还是无法分开。因为缺少脱气泵,也无法使用梯度洗脱。现在不知道怎么解决,求有经验的大佬解答,跪谢!!
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