Hi guys,
I've just joined this group and I would like to ask your help for a problem.
I am using 10x PBS by Lonza withthis composition:
1,440 mg/L of KH2PO4, 90,000 of mg/L NaCl, 7,950 mg/L of Na2HPO4.
I use it as 1x at pH 7.3, 8 and 9.
My problem is that, except for the sample at pH 7.3, in the cases at pH 8 and 9
the value tends to low down. After a couple of days pH 9 solution has lowed
down to pH 8.3.
I changed the pH using high concentrated NaOH, as I found in literature.
Do you know if I made any mistakes that can cause this effect?
Or maybe I chose the wrong kind of PBS?
Thanks all for your help,
Annalisa
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