【摘要】 盐酸为浸提剂,超声波提取空气-乙炔火焰原子吸收光谱法测定烟叶样品中的微量钙、镁。与干法、湿法处理样品进行对照实验,三者间无显著性差异,超声波-酸浸法处理的精密度和回收率略优;测定了国家烟草标准样品GBW08514和GBW08515中钙、镁的含量,其结果与标准值相符;检测了9个2003年度湖南烟叶中的Ca、Mg含量,钙的校准曲线线性范围为0.0-5.0mg/L,线性相关系数是1.0000,方法检出限为0.1602mg/L,回收率为98.9%-101.5%,相对标准偏差≤0.28%;镁的校准曲线线性范围为0.0-0.8mg/L,线性相关系数为0.9992,检出限为0.0039mg/L,回收率为98.5%-102.6%,相对标准偏差≤0.36%;此法快速、安全,适合烟叶中钙、镁的快速检测。更多还原

【Abstract】 The calcium and the magnesium in tobacco sample were extracted by ultrasonic with acid,and determined by flame atomic absorption spectrometry(FAAS). Compared with the dry method,and the wet method, the ultrasonic-acid method has no large difference but with better relative standard deviation and recovery. The tobacco standard samples of GBW08514 and GBW08515 were determined by the ultrasonic-acid method,the results are identical with the standard value. The method was used to analyze nine Hunan tobacco leaves of 2003 with the line range of 0. 0-5. 0mg/L,the correlative coefficient of 1. 0000,the detection limit of 0. 1602mg/L,the recovery of 98. 9%-101. 5% and the relative standard deviation(RSD) of ≤0. 28% for calcium,and the line range of 0. 0-0. 8mg/L,the correlative coefficient of 0. 9992,the detection limit of 0. 0039mg/L,the recovery of 98. 5%-102. 6% and the relative standard deviation (RSD) of <0. 36% for magnesium. This method is fast,safe and suitable for determination of calcium and magnesium in tobacco samples.更多还原