Method for detecting content of fluorescent brightening agent in paper

Abstract

The invention provides a method for detecting a fluorescent brightening agent in paper. The method comprises the steps as follows: 1), sample pretreatment: preparing a standard fragment sample, and soaking the standard fragment sample by different solutions respectively after weighed; 2), adjusting the excitation wavelength of a fluorospectro photometer to be 345 nm, and detecting the sample; 3), weighing a defined quantity of a VBL fluorescent brightening agent to configure a standard liquid with appropriate concentration, scanning an excitation curve and an emission curve, and measuring a standard curve; and 4), measuring the content of the fluorescent brightening agent in different paper samples, and obtaining the content of the fluorescent brightening agent of the detected paper sample through comparison with the standard curve. Compared with a traditional detecting method, the method provided by the invention can detect relevant data rapidly and accurately, the problem of manual interpretation errors caused by manual operation is avoided, and the health and safety of relevant toilet paper products can be elevated accurately; and meanwhile, experimental instruments adopted by the invention are simple, the data repeatability is good, the reliable quality monitoring guarantee is provided, and accordingly the guaranteeing advantages on the product quality monitoring are achieved.

Description

technical field [0001] The invention relates to the technical field of quantitative detection methods for fluorescent whitening agents in household papers such as toilet papers that are in contact with human bodies. Background technique [0002] In the production process of toilet paper, many manufacturers use recycled waste paper as the main pulp raw material in order to reduce production costs. Since the waste paper will inevitably bring ink into the pulp during the recycling process, it reduces the cost of paper. Whiteness. In order to make up for the loss of whiteness, some manufacturers add fluorescent whitening agents to the pulp. Although the visual whiteness of the paper is improved, the fluorescent whitening agents are absorbed by the human body after the skin contacts them, and accumulate in the human body, weakening the whiteness. Immunity of the human body increases the burden on the liver, and may also lead to cell distortion. When in contact with the human bod...

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Problems solved by technology

[0018] At present, the determination method of fluorescent agent components in paper is usually based on the national standard GB / T 5009.78-2003 "Analysis Method for Hygienic Standards of Base Paper for Food Packaging". Under the conditions of 254nm and 365nm ultraviolet light irradiation, the maximum fluorescent area shall not be greater than 5mm 2 , this method only depends on the naked eye observation of the inspector, and cannot quantitatively evaluate the fluorescent substances in the paper, and the detection is greatly affected by human factors and environmental factors, which may easily cause differences in judgment

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