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在国内化学测量工作中,581型比色计和72型分光光度计被广泛使用。这两种仪器的吸光度值读数均是以检流计表面非均匀对数刻度换算而得来的。这两种仪器结构简单、使用方便,但由于表面读数的限制,降低了分析的灵敏度,因此,造成测量数据的标准差加大,从而给分析测试结果带来较大的误差。采用差示比色技术,就可以使在高含量组份的测试中提高灵敏度,从而减小读数的系统误差。下面就差示技术的原理及减小误差的途径进行初步探讨。差示比色的基本原理见参考文献[1]、[2],在一般的比色分析中,往往以组分的空白液调零作参比,如图1所示。当测量高含量组分时,样品C_1的透光度T_1为10％,样品
In the domestic chemical measurement work, 581 colorimeter and 72 spectrophotometer is widely used. The absorbance readings of both instruments are based on a non-uniform logarithmic scale of the galvanometer surface. The two instruments are simple in structure and easy to use. However, the sensitivity of the analysis is reduced due to the limitation of the surface reading. Therefore, the standard deviation of the measurement data is increased, which brings great errors to the analysis and test results. Using differential colorimetric technology, you can increase the sensitivity of high-content components in the test, thereby reducing the systematic error of readings. Below the principle of differential technology and ways to reduce the error to explore. The basic principle of differential colorimetric see reference [1], [2], in the general colorimetric analysis, the component of the blank fluid is often zero for reference, as shown in Figure 1. When measuring high content of components, sample C_1 transmittance T_1 is 10% of the sample