Recipe for Gurr's buffer

[Dr Margaret A. Leversha]

Hi Eric,

Gurrs pH 6.8 phosphate buffer (0.004M):

Make separate solutions of KH2PO4 0.54g/l, 
and Na2HPO4 (anhyd.) 0.57g/l.  
Mix 2 vols KH2PO4 and about 1 vol Na2HPO4 until you get pH 6.8.

Frankly, the tablets are simpler.  

Good luck.

Margaret