Method for determining ratio of lead isotopes in sample of different parts of waxberry tree and identifying origin of waxberry

A technique for isotope ratios, samples, used in analytical chemistry to address issues of increased uncertainty and complexity

Active Publication Date: 2015-12-30
INSPECTION & QUARANTINE TECH CENT OF NINGBO ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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Problems solved by technology

But in fact, plant-based agricultural products are affected by differences in fertilization, meteorological conditions, and farmland soil characteristics, and animal-source foods are also affected by factors such as feed types and feeding methods. The above factors make the identification of the origin of agricultural products uncertain. The development of more effective traceability technology is also an urgent need to accurately identify the origin of agricultural products

Method used

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  • Method for determining ratio of lead isotopes in sample of different parts of waxberry tree and identifying origin of waxberry
  • Method for determining ratio of lead isotopes in sample of different parts of waxberry tree and identifying origin of waxberry
  • Method for determining ratio of lead isotopes in sample of different parts of waxberry tree and identifying origin of waxberry

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Experimental program
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Embodiment 1

[0062] The determination of the isotope ratio of the lead of the different parts samples of bayberry tree in the Cixi origin of embodiment 1

[0063] Waxberry sample, bayberry leaf sample, bayberry branch sample, bayberry tree root sample or bayberry tree root soil sample is to use ceramic scissors after drying bayberry, bayberry tree leaf, bayberry tree branch, bayberry tree root or bayberry tree root soil respectively After cutting it small, it is made by grinding it with a mortar.

[0064] (1) Weigh 1g red bayberry sample, add 10mL concentrated nitric acid; 0.5g leaf sample, add 9mL concentrated nitric acid; For tree branch samples, add 10mL of concentrated nitric acid; for 0.3g bayberry tree root samples, add 7mL of concentrated nitric acid;

[0065] Put them into a microwave digestion apparatus (Multiwave 3000 produced by Anton Paar) for digestion. The heating program is 5min to 400w, hold for 5min, then rise to 800w for 5min, hold for 5min, cool down to room temperature...

Embodiment 2

[0080] Get the red bayberry sample of Cixi, Yuyao, Wenzhou three producing areas, measure the isotope ratio of lead according to the method step of embodiment 1 207 Pb / 206 Pb and 206 Pb / 208 Pb, make a correlation distribution map, such as figure 1 as shown, figure 1 It can be seen that there are significant differences among the isotope ratio distributions of lead in the three producing areas, and each has a different distribution interval. therefore figure 1 It can be used to identify bayberry from different origins. Determination of the isotope ratio of lead on bayberry samples of unknown origin 207 Pb / 206 Pb and 206 Pb / 208 Pb, by observing which distribution interval its numerical distribution is close to, it can be identified as the origin of the distribution interval.

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Abstract

The invention discloses a method for determining a ratio of lead isotopes in a sample of different parts of a waxberry tree and identifying an origin of waxberry. The method comprises the following steps: measuring a sample of different parts of the waxberry tree, preprocessing the sample, digesting the sample by virtue of microwave, purifying the sample by utilizing SR resin-B resin, eluting to obtain a lead sample, and then detecting the lead sample by adopting a thermal surface ionization mass spectrometry to obtain a ratio of lead isotopes in the lead sample. A correlation distribution map can be drawn according to the ratio of the lead isotopes of the sample of the same part in different origins and can be used for identifying the origin situation of the waxberry tree sample of an unknown origin. The thermal surface ionization mass spectrometry is first used for rapidly determining the ratio of lead isotopes in the sample of different parts of the waxberry, a scientific, independent and invariable identify identification information can be provided for tracking the waxberry source, and the method is reliable and stable. Particularly for the products of a large-sized area, the difference can be effectively distinguished. The method is high in detection efficiency; moreover, the detection result is high in precision and good in effect.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a method for measuring the isotope ratio of lead in samples of different parts of red bayberry and identifying the origin of red bayberry. Background technique [0002] The globalization of the food market and the frequent occurrence of food safety incidents have increased the public's attention to the labeling of food origin, leading consumers to pay more and more attention to the source of food. To study the traceability of food and establish a corresponding food traceability system is an important means to ensure food safety. Origin traceability technology has also been widely used in animal / plant-derived foods, such as fruits, vegetables, grains, milk, meat, etc. [0003] The origin traceability analysis technology of agricultural products is mainly based on the identification of specific indicators in agricultural products from different regions. The developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N27/626
Inventor 钟莺莺冯睿俞雪钧殷居易樊苑牧倪梅林劳华均
Owner INSPECTION & QUARANTINE TECH CENT OF NINGBO ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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