System suitability solution
|Mobile Phase||Ammonium dihydrogen phosphate solution (ph4.4): 20.7g|
ammonium dihydrogen phosphate, add 1800ml water to dissolve it,
adjust the pH value to 4.4 with phosphoric acid, mix well, and filter.
Ammonium dihydrogen phosphate solution (ph4.4) / acetonitrile =
90 / 10
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