烟草中钾的流动注射光散射法测定

Determination of Potassium in Tobacco by Flow Injection Analysis-Light Scattering Photometry

利用流动注射与光散射光谱法进行了烟草中钾含量的测定试验，并采用该法和AAS法分别测定了5种牌号卷烟样品中的钾含量。结果表明：K[B（C6H5）4]沉淀在碱性介质中产生的散射光强比在酸性介质中的大；测定波长为420nm，散射光强最大；在10～60μg／mL浓度范围内，散射光强与钾离子浓度线性正相关；方法的检出限为0.547μg／mL，回收率〉90.70％，CV〈3.17％，该法的测定结果与AAS法无显著性差异，适合烟草中钾含量的快速分析。

The potassium contents in 5 tobacco samples were determined with AAS and FIA-LSP （flow injection analysis-light scattering photometry）, respectively. The results indicated that： 1 ） the scattering intensity produced by potassium tetraphenylboron precipitated in basic medium was higher than that precipitated in acid medium; 2） the maximum scattering intensity was obtained at the wavelength of 420 nm, and the intensity linearly positively correlated with potassium concentration within the range of 10-60 mg/mL; 3） the recovery of potassium was over 90.70% with coefficient of variation under 3.17% at the detection limit of 0. 547 mg/mL; and 4） there was no significant difference between the results determined by AAS and FIA-LSP. FIA-LSP is suitable for rapid analysis of potassium in tobacco.