Designation:D7220 − 12 (Reapproved 2017)

Standard Test Method for

Sulfur in Automotive, Heating, and Jet Fuels by Monochromatic Energy Dispersive X-ray Fluorescence Spectrometry

用单色能量色散x射线荧光光谱法测定汽车燃料、加热燃料和喷气燃料中硫的标准试验方法


1.Scope

1.1 This test method specifies an energy-dispersive X-ray fluorescence (EDXRF) method for the determination of total sulfur in automotive, No. 2 heating, and jet fuels with a concentration range of 3 mg ⁄kg to 942 mg ⁄kg.

1.1.1 The pooled limit of quantitation of this test method as obtained by statistical analysis of inter laboratory test results is 3 mg ⁄kg sulfur.

1.1.2 This test method is applicable to gasoline, oxygen enriched gasoline (RFG), diesel, diesel/biodiesel blends con- taining up to twenty volume percent biodiesel, kerosene, jet fuel, jet fuel/biodiesel blends containing up to five volume   percent biodiesel and No. 2 home heating oil.

1. 范围

1.1 本试验方法规定了用于测定3 mg/kg至942 mg/kg浓度范围内汽车燃料、2号加热燃料和喷气燃料中总硫的能量色散X射线荧光（EDXRF）法。

1.1.1 通过实验室间试验结果的统计分析获得的本试验方法的总定量限为3 mg/kg硫。

1.1.2 本试验方法适用于汽油、富氧汽油（RFG）、柴油、含20%生物柴油的柴油/生物柴油混合物、煤油、喷气燃料、含5%生物柴油的喷气燃料/生物柴油混合物和2号家用取暖油。




15.2 The precision of the test method is as follows:

15.2.1 Repeatability—The difference between successive test results obtained by the same operator with the same apparatus under constant operation conditions on identical test material would, in the long run, in the normal and correct   operation of the test method, exceed the value:

15.2 试验方法的精度如下：

15.2.1 重复性—从长期来看，在试验方法的正常和正确

操作中，同一操作员在相同试验材料上使用相同仪器在恒定操作条件下获得的连续试验结果之间的差值，20个结果中只有1个结果，将超过以下值（见表3）：



0.6430·X0.504mg/kg   (5)



where:

X   =  the mean sulfur content of two results between 3 and 942 mg/kg, only in one case in twenty. (See Table 3.)

15.2.2 Reproducibility—The difference between two single and independent results obtained by different operators work- ing in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the value:

那里：

X   = 在3到942 mg/kg 之间的两个结果的平均硫含量。

15.2.2 再现性—从长期来看，在试验方法的正常和正确操作中，在不同实验室对同一试验材料进行操作的不同操作员获得的两个单独和独立结果之间的差值，20个结果中只有1个结果，将超过以下值（见表4）：


1.1121·X0.504mg/kg   (6)



where:

X   =  the mean sulfur content of two results between 3 and 942 mg/kg, only in one case in twenty. (See Table 4.)

式中：

X   = 在3到942 mg/kg之间的两个结果的平均硫含量。

TABLE 3，4  Precision Values, All Sample Types

表3，4 精度值（所有样品类型）

S,mg/kg

Repeatability r,mg/kg

Eq 5 values

Reproducibility R, mg/kg

Eq 6 values

3

1.1

1.9

5

1.4

2.5

10

2.1

3.5

25

3.3

5.6

50

4.6

8.0

100

6.5

11.3

250

10.4

18

500

14.7

25.5

942

20.3

35.1

.


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