建立了一种检测木质纤维素原料中铁含量的三波长可见光谱法。 首先在选定的条件下采用酸水解法对样品进行预处理, 然后进行1,10-菲罗啉显色并以基于416, 510和700 nm波长处的吸光度检测的三波长光谱法来定量样品中的铁含量。 结果表明: 该方法能有效扣除酸水解样品生成的羟甲基糠醛、 酸溶木素等产物以及基线漂移对测定结果的影响; 与电感耦合等离子体发射光谱法(ICP-OES法)的测定结果相比, 该方法的相对误差小于5%。 该方法操作简单、 测定结果准确, 适用于一般科研单位和生产企业对木质纤维素原料中铁含量的测定。

The present paper described a triple-wavelength visible spectroscopic method for the determination of iron content in lignocellulosic materials. After the sample was pretreated with acidic hydrolysis method under selected conditions, the color agent, 1,10-phenanthroline monohydrate, was added in the filtrate and then measured by a triple-wavelength spectroscopic method at wavelengths of 416, 510 and 700 nm, from which the iron contents of the sample can be calculated. The results showed that this method can efficiently deduct the influences of acidic soluble lignin and furfural compounds generated during the sample pretreatment and baseline drift caused by the tiny particles in the filtrates. It not only has a good measurement precision but also is accurate, in which the relative differences of the results obtained by the present method and ICP-OES method is less than 5%. The method is simple and practical, and suitable for industrial applications.