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Method for detecting lead chrome green addition content of tea leaves

A detection method, an art-green technology, applied in measuring devices, material analysis by optical means, instruments, etc., can solve problems such as the inability to exclude other sources of lead and chromium, the inability to perform rapid detection, and the insufficient scope of application. Low system maintenance cost, good application prospects, and the effect of automatic detection

Inactive Publication Date: 2016-03-23
ZHEJIANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Atomic fluorescence spectrometry has the characteristics of high sensitivity, strong selectivity, small sample amount and simple method; but its disadvantage is that the scope of application is not wide enough
[0009] The above methods all identify the presence of heavy metals lead and chromium, and then infer the content of art green, but in the process of processing, other sources of lead and chromium cannot be ruled out
Therefore, the detection of heavy metals lead and chromium alone cannot determine that lead and chromium must come from art green
Moreover, a large amount of reagents are required for pretreatment when using the above method for detection, the process is cumbersome, and rapid detection cannot be achieved

Method used

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  • Method for detecting lead chrome green addition content of tea leaves
  • Method for detecting lead chrome green addition content of tea leaves
  • Method for detecting lead chrome green addition content of tea leaves

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Embodiment Construction

[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0045] 1. Establishment of linear regression model:

[0046] (1) Tea leaves are crushed into powder, mixed evenly with art green according to a certain proportion, and prepared into a test sample whose content of art green is in a gradient distribution.

[0047] Weigh 0mg, 1.5mg, 2mg, 1.5mg, 2mg, 2.5mg Art Green respectively, then add 1g, 3g, 2g, 1g, 1g, 1g tea powder respectively, grind and mix evenly to obtain 0mg / g (Art Green mass / tea quality), 0.5mg / g, 1mg / g, 1.5mg / g, 2mg / g, 2.5mg / g mixed powder, prepared into 6 test objects with gradient distribution of art green content. 20 samples were taken for each content level, and a total of 120 test samples were obtained from 6 test objects.

[0048] Each test sample was mixed with potassium bromide crystals (KBr) at a mass ratio of 1:49, thoroughly ground, and pressed into tablets.

[0049] (...

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Abstract

The invention discloses a method for detecting the lead chrome green addition content of tea leaves. The method includes the steps of firstly, using tea leaves with different lead chrome green addition contents as test samples, and obtaining infrared absorption spectrums, within the set wave number range, of all the test samples; secondly, extracting transmittance of characteristic absorption peaks of lead chrome green and obtaining absorbance of all the characteristic absorption peaks according to the infrared absorption spectrums of the test samples; thirdly, establishing linear regression models between lead chrome green contents and all the absorbance; fourthly, obtaining the absorbance, at the characteristic absorption peaks of lead chrome green, of the test samples, and obtaining the contents of lead chrome green in the test samples according to the linear regression models. The method has the advantages of being simple, rapid and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of art green content detection, in particular to a method for detecting the added content of art green in tea. Background technique [0002] The color of tea plays a decisive role in its quality evaluation. This indicator is not only an important basis for tea classification but also an important factor for distinguishing the quality of tea. In recent years, in order to seek profits, unscrupulous traders have illegally added artistic green to tea to achieve the purpose of improving the appearance of tea. [0003] Art green is a heavy metal mixed dye, also known as "lead chrome green", "emerald chrome green" or "paint green". An industrial pigment. Its main chemical composition is lead chromate, which is very harmful to the human body and can cause anemia, kidney damage, lead poisoning, dermatitis, eczema, chromic nose disease and skin ulcers, etc. The International Cancer Research Center (IARC) has Includ...

Claims

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Application Information

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IPC IPC(8): G01N21/3563
Inventor 李晓丽张裕莹何勇
Owner ZHEJIANG UNIV
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