Appendix; Refractive Index Of Pure Water (15; Brix - Mettler Toledo Refracto 30PX Mode D'emploi

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Appendix

13.1 Refractive index of pure water (15...40 °C)
Temp
°
[ C] n
D
15 1.3334
16 1.3333
17 1.3332
18 1.3332
19 1.3331
20 1.3330
21 1.3329
22 1.3328
23 1.3327
24 1.3326
["Handbook of Chemistry and Physics, 56th Edition"]. Values divided by the
refractive index of air at the corresponding temperatures, according to the for-
mula given in ["Handbook of Chemistry and Physics, 75th Edition"].
13.2

Brix%

Brix% represents the concentration in weight percent of a mixture of pure sucrose
and water (g sucrose per 100 g solution) and is used to express the % weight
concentration of sucrose solutions in general. Brix% is calculated from the mea-
sured refractive index using a concentration table stored in the instrument (source:
20 th conference of the International Commission of Uniform Methods for Sugar
Analysis ICUMSA). The results are given at the standard reference temperature of
20 °C using the temperature dependence for these solutions from the same source.
The refractive index and the prism surface temperature are thus measured and
the Brix% is calculated from the tables.
Note: When substances other than sucrose are present in the sample the
result in Brix% will not indicate the real sucrose concentration.
METTLER TOLEDO Refracto 30PX/GS
Temp
°
[ C] n
D
25 1.3325
26 1.3324
27 1.3323
28 1.3322
29 1.3321
30 1.3319
31 1.3318
32 1.3317
33 1.3315
34 1.3314
Appendix
Temp
°
[ C] n
D
35 1.3312
36 1.3311
37 1.3310
38 1.3308
39 1.3307
40 1.3305
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