电位滴定仪法连续自动测定玉米脂肪酸值标准适用性研究

Standard Adaptability Verification about Continuous Automatic Potentiometric Titration Method for Determination of Fatty Acid Value of Corn

本研究通过与国家标准规定的手工滴定法进行对照,验证连续自动电位滴定法测定玉米脂肪酸值的准确性、重复性、提取液稳定性等性能参数是否满足现有国家标准中规定的要求。研究结果表明,与国家标准方法相比,连续自动电位滴定法测定玉米的脂肪酸值,方法准确性和重复性无显著性差异,能够满足国家标准的各项性能参数要求;样品提取液在敞口条件下放置时间<98min不会影响检测数据的准确性和稳定性。该方法操作简便易行,具有分析精度高、人为误差小、分析速度快和便于实现自动化分析等优点。

By comparing with the manual titration method specified in the national standard, the accuracy, repeatability, stability and other performance parameters of continuous automatic potentiometric titration for determination of corn fatty acid value were verified to meet the requirements specified in the existing national standard. Compared with the national standard method, the continuous automatic potentiometric titration method has no significant difference in the accuracy and repeatability of the method in determining the fatty acid value of corn, which can meet the requirements of various performance parameters of the national standard. The accuracy and stability of the test data will not be affected if the sample extract is placed within 98 min under the condition of exposure. The method is simple and easy to operate, with the advantages of high analysis accuracy, small human error, fast analysis speed and easy to realize automatic analysis.