离子色谱法测定酒精和甲醇中的四种无机阴离子

Determination of four anions in alcohol and methanol by ion chromatography

建立了离子色谱测定酒精和甲醇中F^-、Cl^-、SO_4^(2-)、NO_3^-4种无机阴离子的方法。试样中加入适量氢氧化钠溶液,恒温水浴蒸至近干,用水定容至刻度。色谱柱采用AS15-HC阴离子色谱柱,流动相为40 mmol/L氢氧化钠溶液,流速1.0 m L/min。结果表明:4种阴离子呈良好线性关系(r=0.99902~0.99983),方法检出限分别为0.5、0.5、1.0、1.0 mg/kg,在低、中、高3个加标水平下的平均回收率为82%~110%,相对标准偏差为1.45%~4.64%(n=6)。该方法准确、简便、灵敏、通用、重现性好,可用于酒精、甲醇中4种阴离子的实际检测。

A comprehensive analytical method based on ion chromatography was developed for the determination of four Inorganic anions in alcohol and methanol.The samples were added proper amount of sodium hydroxide solution,then evaporated to dry in a constant temperature water bath and set the volume to scale.The solution was separated by the AS15-HC separating column with the mobile phase of 40 mmol/L sodium hydroxide solution and 1.0 mL/min flow rate.The results indicated that the calibration curves showed good linear relation for 4 anions（ r = 0.99902-0.99983）. The detection limits for the method were 0.5,0.5,1.0 mg/kg and 1.0 mg/kg respectively.The mean recoveries at three spiked concentration levels （low, middle, high） were 82% - 110%, and the relative standard derivations were 1.45 % -4.64% （ n = 6）.The method is reliable, simple and convenient, sensitive, universal and reproducible,which could be rapidly applied in the determination of 4 anions in alcohol and methanol.