基于标准差传递规律的手机比色法测定亚甲基蓝溶液

采用基于误差传递规律的手机比色法测定亚甲基蓝溶液,根据颜色三原色值RGB与灰度值Gr之间的关系,通过标准差传递公式的运算,从理论上证实了间接测量法的可行性。分析了不同光照环境对采集照片质量的影响,将3款不同型号的手机作为采样工具进行对比。结果表明,间接测量法的精密度显著提高,3款手机图片颜色的间接测量值XR、XG、XB与亚甲基蓝质量浓度C之间的变化趋势一致,其中XB与质量浓度C成正比,据此建立了亚甲基蓝质量浓度测定的新方法。该方法对样品测定的相对标准偏差为2.7%~4.8%,加标回收率为91.3%~101%,其稳定性、精密度和准确度均符合测定需求。

Determination of Methylene Blue Solution by Mobile Phone Colorimetric Method Based on Standard Deviation Transfer Law

The methylene blue(MB)solution was determined by mobile phone colorimetric method based on standard deviation transfer law.Through the relationship between the color primary color value RGB and the gray value Gr,calculated by the standard deviation transfer formula,the feasibility of the indirect measurement method was proved theoratically.The influences of three kinds of lighting environment on the quality of photos were analyzed,and three types of mobile phones were used as sampling tools.Results showed that the precision of indirect measurement method was significantly improved.The indirect measurement values XR,XG,XB of phone picture color showed a similar changing trend with methylene blue concentration.XB was proportional to the concentration C.A new method for the determination of methylene blue concentration was established.The recoveries for the method were between 91.3% and 101% with the relative standard deviations of 2.7%-4.8%.The stability,precision and accuracy meet the requirements for determination.