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Refractometry

Refractive index
n= sin i
sin r

Lorentz-Lorentz equation
R= (n2 - 1) M
(n2 + 2) d

n = refractive index (RI)
i = incident ray
r = refracted ray
R = molecular refractivity
M = molecular weight
d = density

Brix Scale (sucrose)
% Brix RI
0.0 1.3330
5.0 1.3403
10.0 1.3479
15.0 1.3557
20.0 1.3639
25.0 1.3723
30.0 1.3811
35.0 1.3902
40.0 1.3997
45.0 1.4096
50.0 1.4200
55.0 1.4307
60.0 1.4418
65.0 1.4532
70.0 1.4651
75.0 1.4774
80.0 1.4901
85.0 1.5003

 

Common Brix %
Sample fluid Brix %
Cutting oils 0 to 8
Oranges 4 to 13
Carbonated beverages 5 to 15
Apples 11 to 18
Grapes and wines 14 to 19
Concentrated juices 42 to 68
Condensed milk 52 to 68
Jams and jellies 60 to 70

 

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