聯系我們
Designation:D7220 ? 12 (Reapproved 2017)
Standard Test Method for
Sulfur in Automotive, Heating, and Jet Fuels by Monochromatic Energy Dispersive X-ray Fluorescence Spectrometry
用單色(se)能量色(se)散x射(she)線(xian)熒光光譜法(fa)測定(ding)汽車燃料(liao)(liao)、加熱(re)燃料(liao)(liao)和噴氣(qi)燃料(liao)(liao)中(zhong)硫的(de)標(biao)準試驗方法(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 本試驗方法(fa)規定了用(yong)于測定3 mg/kg至942 mg/kg濃度(du)范(fan)圍內汽(qi)車燃(ran)料、2號(hao)加熱(re)燃(ran)料(liao)和噴氣(qi)燃(ran)料(liao)中總硫的(de)能量色散(san)X射線熒光（EDXRF）法。
1.1.1 通過(guo)實驗(yan)(yan)(yan)室間試驗(yan)(yan)(yan)結果的(de)統計分析獲(huo)得(de)的(de)本(ben)試驗(yan)(yan)(yan)方法的(de)總定量限(xian)為(wei)3 mg/kg硫。
1.1.2 本試驗方法適用于汽(qi)油、富氧(yang)汽(qi)油（RFG）、柴油、含20%生物柴(chai)油(you)的柴(chai)油(you)/生物柴油混合物、煤油、噴氣燃(ran)料(liao)、含(han)5%生物柴油(you)的(de)噴氣(qi)燃料/生物柴油混(hun)合物和2號家(jia)用取(qu)暖(nuan)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 試驗方法的(de)精(jing)度如下：
15.2.1 重復性—從長期來看，在試驗方法的(de)正常和正確(que)
操(cao)作中(zhong)，同一操(cao)作員在(zai)相同試驗材(cai)料上使用相同儀器在(zai)恒定操(cao)作條件下獲(huo)得的連續試驗結果之(zhi)間的差值，20個結(jie)果中只有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 之間的兩個結果(guo)的平(ping)均(jun)硫含量(liang)。
15.2.2 再現性—從長期(qi)來(lai)看，在試驗方法的正常和正確(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)操作員獲得的兩個單獨(du)和獨(du)立結(jie)果之間的差值，20個(ge)結果(guo)中(zhong)只(zhi)有1個結果，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(jian)的兩個結果的平均硫(liu)含量(liang)。
TABLE 3，4 Precision Values, All Sample Types
表3，4 精(jing)度值(zhi)（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 |
.
..................................................
查看更多(duo)內容，請下載文檔。