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ASTM D7884-2019 用反相高效液相色谱法测定精对苯二甲酸中对甲酰基苯甲酸和对甲苯甲酸的试验方法 Standard Test Method for Determination of 4-Carboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Reverse Phase High Performance Liquid Chromatography
<div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.1</span> This test method covers the determination of the 4-Carboxybenzaldehyde (4-CBA) and <span style="font-style:italic;font-weight:normal;" class="overriddenformat">p</span>-Toluic acid (<span style="font-style:italic;font-weight:normal;" class="overriddenformat">p</span>-TOL) in purified terephthalic acid (PTA) by reverse phase high performance liquid chromatography (HPLC). This method is applicable for 4-CBA from 2 to 500 mg/kg and for <span style="font-style:italic;font-weight:normal;" class="overriddenformat">p</span>-TOL from 10 to 500 mg/kg, respectively.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.2</span> In determining the conformance of the test results using this method to applicable specification, results shall be rounded off in accordance with the rounding-off method of Practice <span class="Body-link1 cdone">E29</span>.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.3</span> The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p></div> <div class="SectionLevel2"> <p class="caveat cdone2"><span class="Head3 cdone">1.4</span> <i>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.</i></p></div> <div class="SectionLevel2"> <p class="WTOcaveat cdone2"><span class="Head3 cdone">1.5</span> <i>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 W...
2023-05-26 02:24:01浏览：34
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RP-HPLC法测定发酵液中β-苯乙醇的研究
运用反相高效液相色谱对发酵液中的β-苯乙醇进行定性定量分析,确定了RP-HPLC测定发酵液中β-苯乙醇的含量的方法.色谱柱:Dikma Diamonsil C18(150mm×4.6mm,5μm,Waters),流动相:甲醇:水=40:60(v/v),流速:1.0mL/min,紫外检测波长:260hm,柱温:30℃,外标法定量.结果:RP-HPLC法测定浓度在4～20μL/10mL时线性关系良好,r=0.9998,平均加样回收率为97 71%,RSD为1.04%(n=5).此方法准确,灵敏,简单,重现性好,适合于发酵液这种复杂体系中β-苯乙醇的定量分析....
2020-06-12 15:40:20浏览：1411
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RP-HPLC法测定发酵液中β-苯乙醇的研究
运用反相高效液相色谱对发酵液中的β-苯乙醇进行定性定量分析,确定了RP-HPLC测定发酵液中β-苯乙醇的含量的方法.色谱柱:Dikma Diamonsil C18(150mm×4.6mm,5μm,Waters),流动相:甲醇:水=40:60(v/v),流速:1.0mL/min,紫外检测波长:260hm,柱温:30℃,外标法定量.结果:RP-HPLC法测定浓度在4～20μL/10mL时线性关系良好,r=0.9998,平均加样回收率为97 71%,RSD为1.04%(n=5).此方法准确,灵敏,简单,重现性好,适合于发酵液这种复杂体系中β-苯乙醇的定量分析....
2020-03-23 18:23:25浏览：1441
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