紫外分光光度法测定粉条中铝含量的 两种前处理方法比较

Comparison of 2 pretreatment methods for determination of aluminium in starch noodles by ultraviolet spectrophotometry

中文关键词:  紫外分光光度法  粉条  铝  前处理方法

英文关键词:ultraviolet spectrophotometry  starch noodles  aluminum  pretreatment method

中文摘要:

      目的 比较干法灰化和湿法消解2种前处理方法对粉条中铝残留量测定的影响。方法 分别用干法灰化和湿法消解两种方法处理样品, 采用国标方法显色后用紫外分光光度法测定加标样品及质控样中铝的含量, 比较回收率和重复性。结果 干法灰化法回收率和重复性都明显高于湿法消解法。干法灰化法的回收率为99.3%~110.5%, 平均回收率为104.3%; 湿法消解法的回收率为70.2%~83.0%,平均回收率为77.6%; 干法灰化法的重复性RSD为9.3%, 湿法消解法的RSD为14.9%。结论 干法灰化法的前处理方法简单、快捷、可操作性强, 对环境和实验者的危害更小, 更适合应用于粉条的批量检验。

英文摘要:

      Objective To compare the effects of dry ashing and wet digestion on the determination of residual aluminum in vermicelli. Methods Samples were treated by 2 pretreatment methods and analyzed by national standard method. Ultraviolet spectrophotometer was used to determine the content of standard-added samples and quality control samples. The recoveries and reproducibility of pretreatment methods were compared. Results The recovery and reproducibility of dry ashing method were obviously higher than those of wet digestion method. The recoveries of dry ashing method were ranged from 99.3% to 110.5%. The average recovery was 104.3%. The recoveries of wet digestion method were ranged from 70.2% to 83.0%. The average recovery was77.6%. The RSD for reproducibility of dry ashing method was 9.3% and the wet digestion method was 14.9%. Conclusion The pretreatment method of dry ashing is easy, fast, maneuverable and less harm to the environment and the experimenter, which is more suitable for batch inspection of vermicelli.