Tris(hydroxymethyl)aminomethane ：
Grade grade for molecular biology, ≥99.9% (T))
assay ≥99.9% (T)
Residue on ignition ≤0.01% (as SO4)
loss on drying ≤0.5% ， 110 °C
pH 10.5-12.0 (25 °C, 4 M in H2O)
useful pH range 7 - 9
pKa (25 °C) 8.1
solubility H2O: soluble4 M at 20 °C, clear, colorless
chloride (Cl-): ≤20 ppm
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