甲壳素富集固相反射分光光度法测定矿样中的铁

Solid Phase Reflection Spectrophotometric Determination of Iron in Geological Samples Enriched by Chitin

本文研究了一种新的固相分光光度法——固相反射分光光度法。论文从理论上推导出反射吸收值ＡＲ与物质相应的浓度ｃ的定量关系。并以甲壳素为吸附剂，以铁（Ⅱ）、邻二氮菲和十二烷基磺酸钠（ＳＬＳ）的缔合物为被吸附物，进行了甲壳素相的反射分光光度法研究。实验表明，ｐＨ在２～９范围内，振荡７ｍｉｎ后，０．０３０ｇ甲壳素对含铁（Ⅱ）６μｇ的缔合物有８９．３％的吸附率，并形成红色稳定的甲壳素相，其最大吸收波长为５０８ｎｍ，铁含量在１～６μｇ／２５ｍＬ范围内，有良好的线性关系，检出限为０．０１２ｍｇ／Ｌ，相对标准偏差为３．５８％。方法用于白云岩中铁的测定，结果令人满意。

This paper studied a new solid phase spectrophotometry solid phase reflection spectrophotometry.The paper infers a quantitative relationship between the reflection adsorption value A R and the analytical concentration c.Choosing chitin as the adsorbent to adsorb the complex of iron,phenanthroline and lauryl sodium sulfate.We studied the chitin phase reflection spectrophotometry.Experiments show that,in pH 2～9 medium ,shaking for 7min,0.030g chitin can adsorb 89.3% of the iron complex and form a stable red chitin phase.Its maximum reflection adsorption wavelength is 508nm .In the range of 1～6μg/25mL Fe,there is a good linear relationship between A R and c.The determination limit is 0.012μg/25mL,and the RSD is 3.58% .This method has been successfully used in the determination of iron in geological samples.