Background library expansion method for direct spectroscopic quantification of additives in mixed systems

Abstract

A method for expanding background database for direct spectroscopy quantitative analysis of additives in mixing system, relates to an auxiliary measuring method for content of additives and comprises the steps of (1) Determining the new background components spectrum bnew to be added; (2) Comparing consistency between the new background components spectrum bnew and the original background matrix B0. There is no need to expand and the operation ends if the height is consistent or differs a lot; if a certain difference exists, enter step (3); (3) Adding the new background components spectrum bnew into the original background matrix B0 to form the new background matrix B1; (4) Calculating the variance value set D1 of space angle value between the calibrated sample set S0 and the new background matrix B1, regressing D1 and the content set C0 of the tested additive in the calibrated sample set S0 to obtain the adjusted new standard curve. The invention does not require quantification or modelling for the new background, with low workload and cost. It is applicable to site rapid determination and rapid adjustment of models after conventional sampling.

Description

technical field [0001] The invention relates to an auxiliary measurement method for additive content, in particular to a background library expansion method for direct spectral quantification of additives in a mixed system. Background technique [0002] On-site rapid detection often encounters the analysis task of whether a certain type of sample is adulterated or whether the ratio meets the requirements. For example, in product quality inspection and food and drug supervision, it is necessary to quickly detect the content of additives. In the prior art, chromatography and spectrophotometry based on characteristic wavelengths are the most widely used methods for detecting the content of additives, such as "A High Performance Liquid Chromatography Method for Determination of Ascorbic Acid Content in Porphyra zebra" with the patent publication number "CN102507757A". The method of ", the patent publication number is " CN104297175A " " the method adopting spectrophotometry to me...

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Problems solved by technology

However, the spectrophotometric method based on the quantification of characteristic peaks cannot analyze samples lacking characteristic peaks; the multivariate statistical analysis modeling method needs to update and calibrate the model to adapt to the addition of new samples, and the model update is to some extent a remodeling In this process, it is necessary to re-quantify the measured object in a new background, and then import it into the original model sample set for re-modeling, which requires a lot of work and high cost; these methods cannot easily respond to system changes

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