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目前,测定饮用水中的丙酮和丁酮浓度,GB5750—85《生活饮用水标准检验方法》及其修订版均无分析方法.我们采用顶空气相色谱法直接测定饮用水和水源水中的丙酮和丁酮,方法简便、快速、灵敏、干扰少.1 实验部分1.1 原理 水中丙酮和丁酮在密封的顶空瓶中.在一定温度下,经一定时间的平衡后在气液两相中达到动态平衡,两相浓度成正比.用聚乙二醇(PEG)6000柱分离,FID检测器检测.1.2 试剂及仪器 丙酮、丁酮均为色谱纯;1ml、5μl、1μl注射器;恒温水浴:精度为±1℃;100ml顶空气液平衡瓶;1102型色谱仪(上海分析仪器厂),2m×3mm不锈钢柱,PEG6000:6201担体=7:100,柱温90℃,气化室温度150℃,检测室温度150℃.载气:氮气流速25ml/min,氢气流速30ml/min,空气流速125ml/min.
At present, there is no analytical method for the determination of acetone and butanone concentrations in drinking water, GB5750-85 Standard Test Method for Domestic Drinking Water and its revisions, and we use headspace gas chromatography to directly determine the contents of acetone and Butanone, the method is simple, fast, sensitive, less interference .1 Experimental 1.1 Principle Water acetone and butanone in sealed headspace bottles at a certain temperature, after a certain period of time in the gas-liquid two phase to achieve dynamic Balance, two-phase concentration is proportional to polyethylene glycol (PEG) 6000 column separation, FID detector detection .1.2 reagents and instruments acetone, butanone are chromatographic pure; 1ml, 5μl, 1μl syringe; ± 1 ℃; 100ml headspace liquid balance bottle; 1102 chromatograph (Shanghai Analytical Instrument Factory), 2m × 3mm stainless steel column, PEG6000: 6201 carrier = 7: 100, column temperature 90 ℃, gasification chamber temperature 150 ℃, Room temperature 150 ° C. Carrier gas: nitrogen flow rate 25 ml / min, hydrogen flow rate 30 ml / min, air flow rate 125 ml / min.