用于給發(fā)動(dòng)機(jī)冷卻降溫的發(fā)動(dòng)機(jī)冷卻液的主要成分為水和乙二醇，添加乙二醇主要是防止在寒冷的冬季停車時(shí)因冷卻液結(jié)冰而脹裂散熱器，凍壞發(fā)動(dòng)機(jī)氣缸或氣缸蓋，同時(shí)避免夏季溫度較高時(shí)發(fā)動(dòng)機(jī)出現(xiàn)開鍋現(xiàn)象。如果在發(fā)動(dòng)機(jī)運(yùn)行過程中冷卻液出現(xiàn)泄漏并進(jìn)入發(fā)動(dòng)機(jī)，會(huì)削弱發(fā)動(dòng)機(jī)油的潤(rùn)滑能力；同時(shí)，乙二醇會(huì)促進(jìn)發(fā)動(dòng)機(jī)潤(rùn)滑油漆膜和沉積物的生成，增大磨損。通過測(cè)試在用發(fā)動(dòng)機(jī)油中乙二醇的含量，監(jiān)測(cè)乙二醇的濃度，可以預(yù)警冷卻液的泄漏程度，避免因乙二醇泄漏積累而損害發(fā)動(dòng)機(jī)，具有較強(qiáng)的應(yīng)用價(jià)值。

ASTM D7922-14的標(biāo)準(zhǔn)采用苯硼酸作為衍生試劑，將樣品中的乙二醇衍生后通過頂空進(jìn)樣器導(dǎo)入氣相色譜進(jìn)行定量分析，這種方法對(duì)于設(shè)備配置要求和衍生試劑成本均較高，不利于推廣。現(xiàn)有技術(shù)中還有采用正己烷稀釋發(fā)動(dòng)機(jī)油油樣，然后用水萃取溶液中的乙二醇，后采用氣相色譜法來測(cè)定乙二醇的含量，這種方法中所采用的試劑正己烷毒性較大，且實(shí)驗(yàn)過程較繁瑣，也不利于推廣應(yīng)用。

浩瀚色譜（山東）應(yīng)用技術(shù)開發(fā)有限公司研究出一種新的發(fā)動(dòng)機(jī)油中乙二醇含量的測(cè)定方法，以解決現(xiàn)有技術(shù)中的問題。


玻璃柱測(cè)發(fā)動(dòng)機(jī)油中乙二醇 測(cè)試譜圖：


Glass column measuring ethylene glycol in engine oil
Measuring ethylene glycol in engine oil with glass column Details:

Name: Glass Column
Fixative: 5% polyethylene glycol 20M
Carrier: Chromosorb T 30/60 mesh
Specification: 1.2m*6.4mm (outer diameter)
Model: 5%peg-20M/Chromosorb T
Application: Determination of trace glycol in engine oil by gas chromatography


The main components of the engine coolant used to cool the engine are water and ethylene glycol. The addition of ethylene glycol is mainly to prevent the radiator from expanding and cracking due to the freezing of the coolant during the parking in the cold winter, and freezing the engine cylinder or cylinder. Cover, and at the same time avoid the engine boiling phenomenon when the temperature is high in summer. If the coolant leaks and enters the engine during engine operation, it will weaken the lubricating ability of the engine oil; at the same time, glycol will promote the generation of engine lubricating paint film and deposits, increasing wear. By testing the content of ethylene glycol in the engine oil in use and monitoring the concentration of ethylene glycol, the degree of leakage of the coolant can be warned to avoid damage to the engine due to accumulation of ethylene glycol leakage, which has strong application value.

The ASTM D7922-14 standard uses phenylboronic acid as the derivatization reagent. After derivatizing the ethylene glycol in the sample, it is introduced into the gas chromatography through the headspace sampler for quantitative analysis. This method has high equipment configuration requirements and high cost of derivatization reagents. Not conducive to promotion. The prior art also uses n-hexane to dilute the engine oil sample, then extracts the ethylene glycol in the solution with water, and finally uses gas chromatography to determine the content of ethylene glycol. The reagent used in this method is more toxic than n-hexane. Large, and the experimental process is cumbersome, and it is not conducive to popularization and application.

Haohan Chromatography (Shandong) Applied Technology Development Co., Ltd. has developed a new method for the determination of glycol content in engine oil to solve the problems in the existing technology.


Test spectrum of ethylene glycol in engine oil measured by glass column: