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分光光度计是一种可用于测量物质微量组分的分析仪器,现已广泛应用于环保、医疗卫生、石油化工、冶金、机械、农业等各个领域。在检定这种仪器时,应注意以下几个问题。一、波长的准确性波长的准确性直接影响分析结果的正确性。以72型分光光度计为例,若波长选择440nm,以含铬量为90μg·ml~(-1) 的重铬酸钾溶液为标准,仪器波长误差引起的相对测定误差在430nm处为7.7％,在450nm处的测定误差为-5.9％;若波长选择510nm,以含钴量为4000μg·ml~(-1) 的氯化钴溶液为标准,波
Spectrophotometer is a kind of analytical instrument which can be used to measure the trace components of materials, and has been widely used in various fields such as environmental protection, medical treatment and sanitation, petrochemical industry, metallurgy, machinery and agriculture. In testing this instrument, should pay attention to the following questions. First, the accuracy of wavelength Wavelength accuracy of a direct impact on the accuracy of the analysis results. Take type 72 spectrophotometer as an example, if the wavelength is 440nm, the relative measurement error caused by the wavelength error of the instrument is 7.7% at the wavelength of 430nm with the potassium dichromate solution containing 90μg · ml -1 of Cr as the standard. , And the measurement error at 450 nm is -5.9%; if the wavelength is selected at 510 nm, using a cobalt chloride solution containing 4000 μg · ml -1 of cobalt as a standard, the wave