Methods | Heating tank volume | Repeating time | Mean heating time |
---|---|---|---|
ISO 15154: 2003 | 7.7 mL | 5 | 3 m 20 s |
Revised method | 10.6 mL | 5 | 4 m 15 s |
Number | Reagent | Method |
---|---|---|
1 | 0.2 mol@L-1 Hydrochloric acid | Add 16.8 mL hydrochloric acid (mass ratio 37%) to 500 mL water, followed by one drop of Brij-35, and dilute the solution to 1 L with water |
2 | 0.4 mol@L-1 sodium hydroxide | Add 16 g sodium hydroxide to 800 mL water, stir until dissolved, then natural cooling to room temperature, followed by one drop of Brij-35, and dilute the solution to 1 L with water |
Method | Project | 1st cup | 10th cup | 20th cup | 30th cup | 40th cup | 50th cup | 60th cup | 70th cup | 80th cup | 90th cup |
---|---|---|---|---|---|---|---|---|---|---|---|
ISO15154: 2003 | Reducing-sugar (%) | 7.52 | 7.30 | 7.22 | 7.20 | 7.17 | 7.13 | 6.72 | 6.55 | 6.48 | 6.45 |
Differences (%) | / | −0.22 | −0.30 | −0.32 | −0.35 | −0.39 | −0.80 | −0.97 | −1.04 | −1.07 | |
Revised method | Reducing-sugar (%) | 7.44 | 7.29 | 7.44 | 7.37 | 7.35 | 7.26 | 7.31 | 7.35 | 7.28 | 7.41 |
Differences (%) | / | −0.15 | 0 | −0.07 | −0.09 | −0.18 | −0.13 | −0.09 | −0.16 | −0.03 |
Sample | Parallel measurement times | Reducing sugar (%) | F | Critical value of F | |
---|---|---|---|---|---|
ISO 15154: 2003 | Revised method | ||||
A | 5 | 26.18 | 26.04 | 1.94 | 5.98 |
B | 5 | 0.54 | 0.5 | 3.00 | |
C | 5 | 24.45 | 24.68 | 0.88 | |
D | 5 | 7.78 | 7.89 | 1.36 | |
E | 5 | 11.18 | 11.31 | 1.56 | |
F | 5 | 22.41 | 22.19 | 2.18 | |
G | 5 | 9.98 | 10.05 | 2.02 |
Sample | Reducing sugar (%) | RSD (%) | |
---|---|---|---|
Within-day | Inter-day | ||
A | 26.21 | 2.42 | 3.04 |
B | 0.52 | 3.94 | 4.24 |
F | 8.08 | 3.45 | 3.60 |
Method | Heating tank consumption | Sample quantity |
---|---|---|
ISO 15154: 2003 | 4 | 3600 |
Revised method | 2 | 4500 |
Sample | Reducing sugar(%) | Addition content (%) | Revised method | |
---|---|---|---|---|
Results (%) | Recovery rate (%) | |||
A | 26.21 | 20.97 | 48.20 | 102.16 |
26.21 | 26.21 | 52.76 | 100.65 | |
26.21 | 31.45 | 57.59 | 99.87 | |
F | 8.08 | 6.46 | 14.28 | 98.22 |
8.08 | 8.08 | 16.09 | 99.54 | |
8.08 | 9.70 | 18.43 | 103.65 | |
G | 12.10 | 9.68 | 21.44 | 98.46 |
12.10 | 12.10 | 23.92 | 98.86 | |
12.10 | 14.52 | 26.93 | 101.18 |
Sample | Mean content (%) | | r | R |
---|---|---|---|
A | 26.14 | 1.3 | 5.2 |
B | 0.52 | 0.4 | 0.6 |
F | 8.07 | 1.2 | 2.9 |
Item | ISO 15154: 2003 | Revised method | |
---|---|---|---|
1 | Reagent | 5% acetic acid | 0.2 mol@L-1 hydrochloric acid |
2 | Pipeline | Blu/blu 1.60 cm3@min-1 | Red/red 0.80 cm3@min-1 |
3 | NaOH concentration | 0.5 mol@L-1 | 0.4 mol@L-1 |
4 | Heating tank volume | 7.7 mL | 10.6 mL |