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Designation:
D7536 ? 16
Standard Test
Method for
Chlorine in Aromatics by
Monochromatic Wavelength Dispersive X-ray Fluorescence Spectrometry
用單色波長色散(san)X射(she)線熒光光譜(pu)法測(ce)定(ding)芳(fang)烴中氯的(de)標準試驗(yan)方法
1. Scope 范圍
1.1 This test method covers the determination of chlorine by monochromatic, wavelength-dispersive X-ray fluorescence (MWDXRF) spectrometry in aromatic hydrocarbons, their derivatives, and related chemicals.
1.2 This test method is applicable to samples with chlorine concentrations from 0.66 mg/kg to 10.07 mg/kg. Higher chlorine concentrations can be determined by quantitatively diluting the sample with a suitable solvent. In an interlaboratory study, the limit of detection was determined to be 0.18 mg/kg.
1.1 該試驗方法包(bao)括在芳烴，其(qi)衍生物和相(xiang)關化學品(pin)中通(tong)過(guo)單色(se)，波長色(se)散(san)X射線熒光(guang)（MWDXRF）光(guang)譜法測定氯。
1.2 本試驗方法適(shi)用(yong)于氯(lv)濃度為0.66 mg / kg至(zhi)10.07 mg / kg的(de)樣(yang)品(pin)。可以通過用(yong)合(he)適(shi)的(de)溶(rong)劑定(ding)量稀(xi)釋樣(yang)品(pin)來確定(ding)更高的(de)氯(lv)濃度。在一項實驗室(shi)間研究中，檢測限確定(ding)為0.18 mg / kg。
5. Significance and Use 意(yi)義和用途
5.1 This test method provides for the precise measurement of the chlorine content of aromatics with minimal sample preparation and analyst involvement. The typical time for each analysis is five or ten minutes.
5.2 Knowledge of the chlorine content of aromatics is important for process control as well as the prediction and control of operational problems such as unit corrosion and catalyst poisoning, and in the blending of products to commodity specifications.
5.3 Various federal, state, and local agencies regulate the chlorine content of some petroleum products, including aromatics. Unbiased and precise determination of chlorine in aromatics is critical to compliance with regulatory standards.
5.1本試驗方法(fa)提供以最少的樣品制備和分析人員的參與，精確測量芳烴的氯含量。 每次分析的典型時(shi)間是五或十分鐘。
5.2 了解芳烴的氯含量對于過程控制(zhi)以(yi)及預(yu)測(ce)和控制(zhi)裝置腐蝕和催化劑中毒(du)等操作(zuo)問題，以(yi)及產品與(yu)商品規格的混合是非常重要(yao)的。
5.3 各種聯邦，州(zhou)和(he)地(di)方機構管理一些石油(you)產(chan)品的(de)(de)氯(lv)含量，包括芳(fang)香劑。 無偏(pian)和(he)精確測定芳(fang)烴中的(de)(de)氯(lv)對于符合法(fa)規標準是至(zhi)關(guan)重要的(de)(de)。
16. Precision and Bias 精度和偏差
16.2 Repeatability—Results should not be suspect unless they differ by more than shown in Table 1, Table 2, or Eq 6. Results differing by less than “r” have a 95 % probability of being correct. Eq 6 shows the relationship between the average of two measurements and “r.”
16.2 重復性 - 結果不(bu)應該是(shi)可疑的(de)(de)，除非它們(men)的(de)(de)差(cha)異超(chao)過表(biao)1，表(biao)2或等式6所示。結果差(cha)異小于“r”的(de)(de)概(gai)率為95％是(shi)正確的(de)(de)。等式6顯(xian)示了兩(liang)次測量(liang)的(de)(de)平均值與“r”之間的(de)(de)關系。
r = 0.3 * X0.3 (6)
where:
X = the average chlorine concentration of two results in mg/kg.
式中(zhong)：
X = 兩個平均氯濃度，單位為mg / kg。
16.3 Reproducibility—Results submitted by two labs should not be considered suspect unless they differ by more than shown in Table 1, Table 2, or Eq 7. Results differing by less than “R” have a 95 % probability of being correct. Eq 7 shows the relationship between the average of two measurements and “R.”
16.3 再現性 - 兩個實驗室提(ti)交的結果不應被視為可疑，除非它們的差異(yi)超過表1，表2或等(deng)式7所(suo)示。結果差異(yi)小于(yu)“R”的概率為95％是正確的。 公式7顯示了兩次測(ce)量的平(ping)均值與“R”之間的關系。
R = 0.5 * X0.5 (7)
where:
X = the average chlorine concentration of two results in mg/kg.
式中：
X = 兩個平均(jun)氯濃度(du)，單(dan)位為mg / kg。
TABLE 2 Calculated Precision Values
表2 計算的精度值
|
Cl, Concentration, mg/kg |
Repeatability r, mg/kg Eq 6 values |
Reproducibility R, mg/kg Eq 7 values |
|
0.66 |
0.26 |
0.41 |
|
0.75 |
0.28 |
0.43 |
|
1.00 |
0.30 |
0.50 |
|
2.00 |
0.37 |
0.71 |
|
5.00 |
0.49 |
1.12 |
|
7.00 |
0.54 |
1.32 |
|
10.07 |
0.60 |
1.59 |
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