Beijing Bei Fen Tianpu Instrument Technology Co., Ltd
Beijing Beifen Tianpu Instrument Technology Co., Ltd.
Study on Testing Water Content of Interior Wall Coating by Gas Chromatograph
Release time:
2021-12-28
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Gas chromatography (GC) is a separation technique. In practical work, the samples to be analyzed are often multi-component mixtures in complex matrices. For samples containing unknown components, they must be separated first, and then the relevant components can be further analyzed. For the test of the water content of the interior wall paint, we can use the GC9800 online gas chromatograph. In addition, electronic balance, micro sampler, small glass bottle with rubber stopper, glass syringe, pipette, capillary column and other equipment are needed.
气相色谱是一种分离技术。在实际工作中，需要分析的样品通常是复杂基质中的多种混合物。对于成分未知的样品，首先要分离，然后进一步分析相关成分。GC9800在线气相色谱法可用于检测内墙涂料中的水分。此外，还需要电子天平、微型进样器、小玻璃瓶、玻璃注射器、吸管、毛细管柱等设备。
检测试剂为水，二甲基甲酰胺，内标为无水乙醇(色谱纯化)。在使用乙醇和二甲基甲酰胺之前，应使用卡尔费休法来确定其水分。如果含水量大于0.01%，需要干燥脱水，直至达到要求。
测试原则：
在搅拌均匀的样品中，加入适量内标，稀释少许二甲基甲酰胺。摇匀后，将样品通过载气(H2)载气(0.3μL)送入气相色谱柱。样品中的水分与色谱柱中的其他挥发性物质分离，用热导池法检测，记录色谱图，用内标法测定含水量。
确定相对质量修正系数：
1.准备标准样品。
纯化水1.15g分别从10ml样品瓶中称量，以无水醇0.2g为内标色谱柱，以2ml移液管或玻璃注射器为稀释剂，以2ml无水二甲基甲酰胺为稀释剂密封摇动。
2.确定相对质量修正系数。
稳定后，用1.0μL微进样器吸收0.3μL标准样品，注入气相色谱仪，记录色谱图和色谱数据。色谱仪按分析条件运行一次，4-5针标准样品可连续进样。
3.计算相对质量修正系数。
计算出纯水对无水乙醇的质量校正系数Fi值。
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