Tris(hydroxymethyl)aminomethane-a primary standard?
Commercially available "primary standard" grade tris(hydroxymethyl)aminomethane (THAM) may not always be of the requisite quality. Crystals of THAM can contain large amounts of occluded mother liquor. Material which has been ground, dried in vacuum, further ground, sifted through a 100-mesh sieve, and finally dried in vacuum, will approach 100% in purity.
Koch
W F
WF
Departments of Chemistry and Earth Sciences, Iowa State University, Ames, Iowa 50010, U.S.A.
Biggs
D L
DL
Diehl
H
H