Phosphate-Citrate Buffer pH 4.0

Composition

Concentration	Ingredient
38.6 mM	Na₂HPO₄
30.7 mM	Sodium Citrate Tribasic

Amount to add	Ingredient
3.9 ml	Sodium Phosphate Dibasic, 1 M
3.1 ml	Sodium Citrate Tribasic, 1 M