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ASTM E2193-2008

用紫外线分光光度分析法测定单乙二醇紫外光透射率的试验方法

Standard Test Method for Ultraviolet Transmittance of Monoethylene Glycol (Ultraviolet Spectrophotometric Method)

适用范围:<p>Knowledge of the ultraviolet transmittance of monoethylene glycol is required to establish whether the product meets the requirements of its quality specifications.</p> <p>Dissolved oxygen in organic solvents, such as MEG, forms complexes that shift the solvent absorption from the vacuum ultraviolet range into the measurable UV range (near 190 to 250 nm). Monoethylene glycol has a UV absorption peak at 180 nm. For MEG-oxygen complexes, this peak is shifted to a longer wavelength, thus increasing the absorbability at 220 nm. </p> <p>However, this effect is not observed in water. There is no significant measurable effect due to dissolved oxygen in water that would require nitrogen sparging prior to using for collection of the reference spectrum.</p> <p>Nitrogen sparging and re-measurement of suspect or borderline glycol samples at 220 nm can be used as a tool to rule out or confirm the presence of UV affecting contaminants other than oxygen.</p><p id="s00002">1.1 This test method covers a procedure for the determination of the transmittance of monoethylene glycol (1,2-ethanediol; MEG) at wavelengths in the region 220 to 350 nm. The results provide a measure of the purity of the sample with respect to ultraviolet absorbing compounds.</p> <p id="s00003">1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p> <p id="s00004">1.3 <span class="italic">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.</span> <p id="s00005">1.4 Review the current Material Safety Data Sheets (MSDS) for detailed information concerning toxicity, first aid procedures, and safety precautions.</p>

实施日期: 2008-04-01

中标分类号: G16 - 化工 - 基本有机化工原料

ICS分类号: 71.040.50 - 化工技术 - 物理化学分析方法

标准组织: ASTM - 美国材料与试验协会标准

全文来源: WF

英文关键词: monoethylene glycol spectrophotometric ultraviolet transmittance Monoethylene glycol (MEG) Spectrophotometry--ultraviolet Transmittance and reflectance Ultraviolet (UV) spectrochemical analysis

语种: 汉语

页数: 5

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