Parameter

Range studied

Optimum value

HMDSA (%v/v)

1.5-12

10

Temperature (°C)

60-92

90

Injection volume (ml)

100-750

500

Reaction coil RC1 length (cm)

100-500

300

Acid solution flow rate (ml/min)

0.5-1.3

1.0

Basic solution flow rate (ml/min)

1-4

3

Concentration time (min)

1-4

3