论文部分内容阅读
提出用分光光度法测定催化裂化干气制乙苯催化剂中镧含量的方法。用偶氮胂（Ⅲ）作显色剂，与镧在ｐＨ＝２．８～３．０条件下显色，在最大吸收波长６６５ｎｍ处，测得表观摩尔吸光系数为４．８６×１０４Ｌ／（ｍｏｌ·ｃｍ），线性范围为０～３７μｇ／２５ｍｌ。方法可直接用于催化剂中镧的测定。其加标回收率为９８．４％～１０３．１％，相对标准偏差小于１．０７％，方法的准确性和精密度良好。
A spectrophotometric method for determination of lanthanum in ethylbenzene catalyst for FCC dry gas was proposed. Arsenazo (Ⅲ) was used as a chromogenic reagent, and lanthanum was developed at pH = 2.8 ~ 3.0. The maximum absorption wavelength at 665nm showed that the apparent molar absorptivity was 4.86 × 104 L / (Mol · cm), the linear range of 0 ~ 37μg / 25ml. The method can be directly applied to the determination of lanthanum in catalyst. The spiked recoveries were 98.4% -103.1% with relative standard deviations less than 1.07%. The accuracy and precision of the method were good.