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 Table
1 Leakage of bonded phase and silica from Kromasil
phases at pH>13.
conditions: Carbon
content: C4: 7.7% carbon(w/w), C8: 11.8% carbon(w/w)columns:
4.6 x 250 mm(new columns) Eluent: n-propanol:
0.1M NaOH(7:3v/v) Flow rate: 1.0ml/min.Total
volume: 41.5 ml(=10 column volumes) Detection
method: Atomic absorption(Si) Detection limit: 0.5
ppm
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 Table
2 Leakage of bonded phase and silica from Kromasil
C8 at two different mobile phase pH, 8 and 2.
conditions,
pH 8 : Coliumn: 4.6 x 250 mm (new column) ·
Mobile phase 1 : n-propanol : buffer (10 : 90)
· Mobile phase 2 : n-propanol : buffer (70
: 30) Buffer : NH4Ac(0.2M)/NH3, pH=8.0 ·
Flow rate: 0.5ml/min. Total volume: 1,315ml(317
column volumes) Detection method: Atomic abs.(Si)
· Detection limit: 0.5 ppm conditions,
pH 2 : Coliumn: 4.6 x 250 mm (new column) ·
Mobile phase 1: n-propanol : H2O(10
: 90 : 0.1) · Mobile phase 2: n-propanol
: H2O(70
: 30 : 0.1) Flow rate: 0.5ml/min.· Total
volume : 1,315 ml (317 column volumes) ·
Detection method: Atomic abs.(Si) · Detection
limit: 0.5 ppm
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