Research on Photometric Traceability Technology of Multi-Parameter Rapid Food Tester

With the increasing prominence of food safety issues, the application of multi-parameter rapid food testers is becoming more and more widespread. The aim of this paper was to address the need for metrological traceability of spectrophotometric multi-parameter rapid food testers for rapid food safety testing applications. In this paper, the photometric linear calibration device for multi-parameter food on-site rapid detector, a standard filter with a transmission ratio measurement range of 5% ∼ 90% and Urel=0.4% ∼ 2.6% (k=2), was developed to address the need for photometric linear calibration of multi-parameter food on-site rapid detector in different nanometer bands. The developed absorbance linear solution standards included: potassium dichromate linear solution standards (0.1 μg/μL, 0.2 μg/μL, 0.4 μg/μL, 0.6 μg/μL), cobalt chloride linear solution standards (10 μg/μL, 20 μg/μL, 30 μg/μL, 40 μg/μL) and copper sulfate linear solution standards (10 μg/μL, 20 μg/μL, 40 μg/μL, 60 μg/μL), which could satisfy the requirements for linear calibration of the spectrophotometric calibration system in the range of 400 nm ∼ 600 nm. The developed fiber optic spectrometer for calibration of multi-parameter on-site rapid food tester proved to be effective in testing the wavelength accuracy of multi-parameter on-site rapid food tester, with the wavelength accuracy of the fiber optic spectrometer reaching ±1.0 nm. This study could effectively solve the demand for photometeric traceability of multi-parameter food rapid detectors, providing new scientific support for the rapid development and technological progress of rapid detection instruments.