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首页> 外文期刊>CHROMATOGRAPHY >Purge-and-Trap Extraction with a Miniaturized Extraction Capillary for the Determination of Aqueous Formic Acids in Ion Chromatography
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Purge-and-Trap Extraction with a Miniaturized Extraction Capillary for the Determination of Aqueous Formic Acids in Ion Chromatography

机译：小型萃取毛细管吹扫捕集萃取，用于离子色谱法中甲酸水溶液的测定

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Aqueous formic acid (FA) was determined by purge-and-trap extraction with a miniaturized extraction capillary using ion chromatography (IC). The extraction capillary was prepared by packing particulate activated carbon in a stainless-steel capillary (0.8 mm i.d., 1.6 mm o.d.). FA was purged from the sample solution and extracted on the extraction medium in its molecular form. Following extraction, the extraction capillary was connected directly to a six-port valve of the IC. The extracted analyte was eluted with sodium hydroxide solution as the formate ion and introduced to a conventional IC. The extraction capillary can be reused after conditioned by passing hydrochloric acid solution. The limit of detection of FA in a standard aqueous sample is 0.5 mg/L. The method was successfully applied to determine FA in fruit juices without significant interference.
机译：甲酸水溶液（FA）使用离子色谱仪（IC）通过微型萃取毛细管通过吹扫捕集萃取法测定。通过将颗粒状活性炭填充在不锈钢毛细管（内径为0.8 mm，外径为1.6 mm）中来制备萃取毛细管。从样品溶液中清除FA，并以分子形式提取到提取介质中。提取后，将提取毛细管直接连接至IC的六通阀。提取的分析物用氢氧化钠溶液作为甲酸盐离子洗脱，并引入常规IC中。通过使盐酸溶液经过调节后，提取毛细管可以重复使用。标准水溶液样品中FA的检出限为0.5 mg / L。该方法成功应用于果汁中FA的测定，无明显干扰。

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