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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(yong)單色(se)能量色(se)散x射線熒光光譜(pu)法(fa)測定汽(qi)車燃(ran)(ran)料、加(jia)熱燃(ran)(ran)料和噴氣(qi)燃(ran)(ran)料中硫的標(biao)準(zhun)試驗方法(fa)
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 本試驗(yan)方法規定(ding)(ding)了用于測定(ding)(ding)3 mg/kg至942 mg/kg濃度范(fan)圍內(nei)汽車燃料、2號加熱燃(ran)料(liao)和(he)噴(pen)氣燃(ran)料(liao)中總硫的能量色散X射(she)線(xian)熒光（EDXRF）法。
1.1.1 通(tong)過實驗(yan)室間試驗(yan)結果(guo)的統(tong)計分析獲得的本試驗(yan)方法的總定量限(xian)為3 mg/kg硫(liu)。
1.1.2 本試驗方法適用于汽油、富氧汽油（RFG）、柴油、含20%生(sheng)物(wu)柴油(you)(you)的柴油(you)(you)/生物柴油混合物、煤(mei)油、噴(pen)氣(qi)燃料、含5%生物柴油的噴氣燃料(liao)/生物柴(chai)油混合物和2號家(jia)用取(qu)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 試(shi)驗方(fang)法的精度如下：
15.2.1 重(zhong)復性—從長(chang)期來看，在試(shi)驗方法(fa)的正常(chang)和正確
操作(zuo)中，同一操作(zuo)員在(zai)相(xiang)同試(shi)(shi)驗材(cai)料上使用(yong)相(xiang)同儀(yi)器(qi)在(zai)恒定操作(zuo)條件下(xia)獲(huo)得的連續試(shi)(shi)驗結果(guo)之間的差值，20個結果(guo)中(zhong)只有1個結果，將超過以下值（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3到942 mg/kg 之間的(de)兩個結(jie)果的(de)平均硫含量。
15.2.2 再現性(xing)—從(cong)長(chang)期來看，在試驗方法的正常和(he)正確(que)操作中，在不同(tong)實驗室對同(tong)一試驗材料進行操作的不同(tong)操作員(yuan)獲得的兩個(ge)單獨和(he)獨立結果之間的差值，20個結果中只(zhi)有1個結果(guo)，將超(chao)過以下值（見表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)兩個結果的(de)平均硫(liu)含量。
TABLE 3，4 Precision Values, All Sample Types
表(biao)3，4 精(jing)度值（所有樣品類型）
|
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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