钛铁试剂分光光度法测定土壤中铁

Spectrophotometric Determination of Iron and Titanium in Soil Using Trion

研究了钛铁试剂分光光度法测定土壤中铁的方法，探讨了方法的最佳条件。结果表明，以钛铁试剂为显色剂，可于560nm处测定土壤中铁的含量，铁含量在0-3mg／L范围内服从比尔定律，线性回归方程为Y=0．0889x，相关系数1=0．9984，表观摩尔吸光系数为K560=5．12×10^4L·mol^-1·cm^-1。该方法简便，选择性好，灵敏度高。此法用于土壤中铁的测定，结果与磺基水杨酸法相符。样品标准加入回收率分别为95．6％～99．9％，相对标准偏差为0．34％-0．53％（n=6）。

A new method for spectrophotometric determination of iro studied, and the optimal conditions of the method were investigated. n and titanium in soil using tiron was The results showed that using tiron as chromogenic reagent, the amount of Fe was determined at 560nm in soil sample. Beer＇s law was obeyed in the range of 0 -3 mg/L for iron（ Ⅲ ） , the linear regression equation was y = 0.0889x with correlation coefficient of 0. 9984 ,and the apparent molor absorption coefficient was found as 5.12 ×10^4 L · mol^-1 · cm^-1 This method was simple, sensitive and has a good selectivity. It has been used for the determination of iron and titanium in soil, and the results obtained agreed with those ones achieved by Sulfosalicylic acid method. The recovery was 95.6% -99.9%, the RSD was 0.34% -0.53% （n =6）.