超声萃取-ICP-OES法快速测定食品中硼砂

建立超声萃取-电感耦合等离子体发射光谱（ICP-OES）法快速测定食品中硼砂含量的方法。食品样品经水超声萃取后,直接采用ICP-OES法测定其中硼元素含量,再换算成硼砂的含量。该法在0.05⁵0mg/L范围内线性良好,相关系数为0.9999,检出限为0.95mg/kg（以硼砂计）,低中高三个不同浓度加标回收率为99.1%¹02.4%,相对标准偏差为0.55%⁰.80%。该方法操作简单,分析快速、灵敏、准确,适用于食品中硼砂含量的测定。 

Rapid determination of borax in food by ICP-OES method with water ultrasonic extraction

Rapid determination method of borax content in food by inductively coupled plasma atomic emission spectrometry ( ICP- OES) with water ultrasonic extraction was established. Food sample was extracted by water ultrasonic, and the boron element content in food was directly determined by ICP- OES method, conversion into borax content again.The calibration curve was linear in the range of 0.05⁵0mg /L, the correlation coefficient was 0. 9999 and the detection limit was 0.95mg /kg ( the borax) , the spiked recoveries ranged from 99.1% to 102.4% of three different levels, the relative standard deviation was 0.55% ⁰.80%.It indicated that the method was simple, sensitive, accurate and short of analytical cycle, which could meet the demand for the determination of borax content in food.