Hello everyone, currently i try to measure phosphate concentrations in a solid sample example soil and plant material. Both materials are digested using acid digestion method to turn in liquid. I notice that the liquid sample are not suitable to be analyzed using Ion chromatography because it is to a acidic (pH 1- 2).

Can anyone suggest different method or how to neutralise the sample ph to 5?

Note :

chemical use in soil digestion

1.HF

2.HNO3

3.HCL

4.H2O2

Chemical use in plant digestion

1.HNO3

2.HCL