f = boiling range correction from Table 18
B = bromine number expressed as grams of bromine per 100 g of sample
M = molecular weight (relative molecular mass of olefin as given in Table 19
Determining the Sulfur Content by Lamp Method
This test method determines the total sulfur in liquid petroleum products in concentrations of 0.01–0.4 wt%. This method is applicable to all petroleum liquids that
can be burned in a wick lamp. It therefore covers gasoline, kerosene, and naphtha. A
blending procedure can be applied to determine the sulfur content in oils and
heavier fractions which cannot be burned directly in the wick burner. Figure 12
shows the details of the assembled lamp unit. Figure 13 is a schematic diagram of
the CO 2 –O 2 supply manifold and lamp system.
ASTM D1266
The sample is burned in a closed system using a suitable lamp (Fig. 12) and an
artificial atmosphere of 70 % carbon dioxide and 30 % oxygen to prevent the
Table 18 Boiling range
correction for olefins
Boiling range correction, f
Boiling range IBP to FBP,
C
1.0
0
0.975
7
0.950
14
0.925
21
0.900
28
0.875
38
0.850
43
0.825
53
0.800
62
0.775
72
0.750
95
0.725
99
0.700
125 or greater
Table 19 Relation of
average molecular weight
to 50 % boiling point
50 % boiling point,
C
Average molecular weight
30
72
66
83
93
96
121
110
149
127
177
145
204
164
232
186
Quality Control of Products in Petroleum Refining
679