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Designation:D7220 ? 12 (Reapproved 2017)
Standard Test Method for
Sulfur in Automotive, Heating, and Jet Fuels by Monochromatic Energy Dispersive X-ray Fluorescence Spectrometry
用單(dan)色能量色散x射線熒光(guang)光(guang)譜(pu)法測定汽車燃料(liao)、加熱(re)燃料(liao)和噴氣燃料(liao)中硫的標準試驗方法
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. 范圍
1.1 本(ben)試驗方法規定(ding)了用于測定(ding)3 mg/kg至(zhi)942 mg/kg濃度范(fan)圍內汽車燃料(liao)、2號加熱燃(ran)料和噴(pen)氣燃(ran)料中總硫的能量色散X射線熒光(guang)（EDXRF）法。
1.1.1 通(tong)過(guo)實驗室間試驗結果的統(tong)計分析獲得的本試驗方(fang)法的總定量(liang)限為3 mg/kg硫。
1.1.2 本試驗方法適用于汽(qi)(qi)油(you)、富氧汽(qi)(qi)油(you)（RFG）、柴油、含20%生物柴油的(de)柴油/生物柴油(you)(you)混(hun)合物、煤油(you)(you)、噴氣燃(ran)料、含5%生物柴(chai)油的噴氣燃(ran)料/生物柴油混合物和2號家(jia)用取暖油(you)。
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 試驗方(fang)法的精度如下(xia)：
15.2.1 重復性(xing)—從(cong)長(chang)期來看，在試驗方法的正(zheng)常(chang)和(he)正(zheng)確
操(cao)(cao)作(zuo)中，同一(yi)操(cao)(cao)作(zuo)員在相同試(shi)驗材料(liao)上使用相同儀器在恒定操(cao)(cao)作(zuo)條件下獲得的連續試(shi)驗結(jie)果之(zhi)間的差值，20個結果中只(zhi)有(you)1個(ge)結(jie)果，將超過以下值(zhi)（見表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(zai)3到942 mg/kg 之間的兩個結果的平均硫含量。
15.2.2 再(zai)現性—從長期來看，在試(shi)驗(yan)方法的正常和正確操(cao)(cao)作(zuo)中，在不同(tong)(tong)實驗(yan)室對(dui)同(tong)(tong)一試(shi)驗(yan)材料進行操(cao)(cao)作(zuo)的不同(tong)(tong)操(cao)(cao)作(zuo)員獲得的兩個單(dan)獨(du)和獨(du)立結果(guo)之間的差值，20個結果中只有1個(ge)結(jie)果，將超過以下值（見(jian)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之間的(de)兩個結果(guo)的(de)平均硫(liu)含(han)量(liang)。
TABLE 3，4 Precision Values, All Sample Types
表3，4 精度值（所有樣(yang)品類型）
|
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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