5.1 Thiodiglycol is a Schedule 2 compound under the Chemical Weapons Convention (CWC). Schedule 2 chemicals include those that are precursors to chemical weapons, chemical weapons agents or have a number of other commercial uses. They are used as ingredients to produce insecticides, herbicides, lubricants, and some pharmaceutical products. Schedule 2 chemicals can be found in applications unrelated to chemical weapons. Thiodiglycol is both a mustard gas precursor and degradant as well as an ingredient in water-based inks, ballpoint pen inks, dyes and some pesticides.45.2 This test method has been investigated for use with reagent and surface water.1.1 This procedure covers the determination of thiodiglycol (TDG) in surface water by direct injection using liquid chromatography (LC) and detected with tandem mass spectrometry (MS/MS). TDG is qualitatively and quantitatively determined by this test method. This test method adheres to single reaction monitoring (SRM) mass spectrometry.1.2 This test method has been developed by U.S. EPA Region 5 Chicago Regional Laboratory (CRL).1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 The detection verification level (DVL) and reporting range for TDG are listed in Table 1.TABLE 1 Detection Verification Level and Reporting RangeAnalyte DVL (μg/L) Reporting Range (μg/L)Thiodiglycol 20 100–10 0001.4.1 The DVL is required to be at a concentration at least 3 times below the reporting limit (RL) and have a signal/noise ratio greater than 3:1. Fig. 1 displays the signal/noise ratio at the DVL.FIG. 1 Example SRM Chromatograms Signal/Noise at Detection Verification Level1.4.2 The RL is the concentration of the Level 1 calibration standard as shown in Table 2. The reporting limit for this test method is 100 μg/L.TABLE 2 Concentrations of Calibration Standards (PPB)Analyte/Surrogate LV 1 LV 2 LV 3 LV 4 LV 5 LV 6 LV 7Thiodiglycol 100 250 500 1 000 2 500 5 000 10 0003,3’-Thiodipropanol 100 250 500 1 000 2 500 5 000 10 0001.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 加购物车

定价： 646元 加购物车

定价： 712元 加购物车

5.1 A knowledge of the hydrocarbon composition of the middle distillates, including the biodiesel blends is useful in following the effect of changes in process variables, diagnosing the source of plant upsets, and in evaluating the effect of changes in composition on product performance properties. The total aromatics content and polycyclic aromatics content are also important to evaluate the quality of diesel fuels/biodiesel blends. It requires an appropriate analytical method to make such determinations for diesel fuel/biodiesel blends production process and quality control.5.2 This test method provides a comprehensive analytical strategy for the determination of the total aromatics contents, polycyclic aromatics contents and the detail hydrocarbon composition of diesel fuel/biodiesel blends to ensure compliance with certain specifications or regulations.5.3 Test Method D2425 is applicable to the determination of the detailed hydrocarbon composition in middle distillates, however, the pre-separation procedure of elution chromatography is time-consuming and not eco-friendly. By combining with the separation procedures described in Test Method D8144, the dual column GC-MS system proposed in this method can determine the total aromatic hydrocarbon contents, polycyclic aromatic hydrocarbon contents and detailed hydrocarbon composition of diesel fuel/biodiesel blends simultaneously. The content of FAME in biodiesel blends can also be determined by GC. It is demonstrated to be time-saving and eco-friendly for the quality control of diesel fuel and biodiesel blends.1.1 This test method covers an analytical scheme using the gas chromatography/mass spectrometry (GC-MS) to determine the hydrocarbon types present in middle distillates 170 °C to 365 °C boiling range, 5 % to 95 % by volume as determined by Test Method D86, including biodiesel blends with up to 20 % by volume of fatty acid methyl ester (FAME). The detailed hydrocarbon composition, total aromatic hydrocarbon and polycyclic aromatic hydrocarbon contents can be determined. The hydrocarbon types include: paraffins, noncondensed cycloparaffins, condensed dicycloparaffins, condensed tricycloparaffins, alkylbenzenes, indans or tetralins, or both, CnH2n-10 (indenes, etc.), naphthalenes, CnH2n-14 (acenaphthenes, etc.), CnH2n-16 (acenaphthylenes, etc.), and tricyclic aromatics. The content of FAME in biodiesel blends can also be determined by GC.1.2 The values stated in acceptable SI units are to be regarded as the standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 加购物车

定价： 646元 加购物车

定价： 646元 加购物车

定价： 646元 加购物车

定价： 571元 加购物车

定价： 712元 加购物车

定价： 646元 加购物车

定价： 646元 加购物车

定价： 646元 加购物车

定价： 646元 加购物车

定价： 646元 加购物车

定价： 646元 加购物车