离子色谱法测定浓香型白酒窖泥中水溶性钾的含量

Determination of Water-soluble Potassium in Nongxiangxing Baijiu Cellar Mud by ICS

建立了离子色谱法测定浓香型白酒窖泥中水溶性钾含量的方法。样品经风干过筛、称量、加水超声提取、离心取上清液、过0.22μm微孔滤膜后稀释进样,采用IonPacTM CS12A RFICTM分离柱(4×250mm)分离,20mmol/L甲基磺酸水溶液为淋洗液进行等度洗脱,流速:1.0mL/min,进样量:25μL,检测器:ICS-5000+DC电导检测器。在0.5~10.0mg/L范围内呈线性,相关系数R^(2)=0.99998,窖泥样品加标回收率为92.3%~101.62%。该方法满足方法学精密度的要求,可用于检测窖泥中水溶性钾的含量,从而监测窖泥的老熟过程中水溶性钾的含量水平,为浓香白型白酒窖池的日常养护供数据依据。

To establish an ion chromatography method for the determination of water-soluble potassium in luzhou-flavor white wine cellar mud.the samples were air-dried,screened,weighed,ultrasonic extraction was added with water,and the supernatant was extracted by centrifugation.After passing through 0.22μm microporous filtration membrane,the supernatant was diluted and injected.The separation was performed on an IonPacTM CS12A RFICTM separation column(4×250mm),and 20mmol/L methylsulfonate aqueous solution was used as eluent for isoelution.1.0mL/min,sample size:25μL,detector:ICS-5000+DC conductivity detector.The results were linear in the range of 0.5~10.0mg/L,and the correlation coefficient R^(2) was 0.99998.The recoveries of pit mud samples were 92.3%~101.62%.This method can meet the requirements of methodological precision,and can be used to detect the content of water-soluble potassium in pit mud,so as to monitor the content level of water-soluble potassium in the aging process of pit mud,and provide data basis for the daily maintenance of luzhou-flavor baijiu cellar.