Method for detecting perchlorate in tea leaves

A technology of perchlorate and detection method, which is applied in the detection field and achieves the effect of good linear relationship

Inactive Publication Date: 2020-12-01
陈泽宇
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above situation, we intend to invent a method for detecting perchlorate in tea, aiming to use the most convenient pretreatment method and the most reasonable equipment to make up for the gap in the detection of perchlorate in domestic tea

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  • Method for detecting perchlorate in tea leaves

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] A method for detecting perchlorate in tea, comprising the steps of:

[0023] S1. Sample sampling: Weigh 0.5g tea sample and put it into a measuring cup, wherein the measurement accuracy of the tea sample is accurate to 0.0001g;

[0024] S2. Sample soaking: Take 40mL of boiling water, add it into the measuring cup containing the sample, soak the tea sample, and let it stand to cool to room temperature;

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Abstract

The invention discloses a method for detecting perchlorate in tea leaves. The method comprises the following steps: S1, sampling a sample: weighing 0.5 g of tea leaf sample and putting the tea leaf sample into a measuring cup, wherein the measuring precision of the tea leaf sample is accurate to 0.0001 g; S2, soaking the sample: filtering the soaking solution in the step S2, and then, filling a 100mL volumetric flask with the filtered soaking solution; S3, filtering the sample: adding a perchlorate isotope internal standard solution into the 100mL volumetric flask filled with the soak solution; S4, fixing the volume of the sample; S5, purifying the sample; and S6, detecting on a machine. Compared with a liquid mass method, ion chromatography takes ion exchange as a main working mechanism,a pure water phase sample extracting solution is allowed to be directly injected in a large volume, and the perchlorate can obtain higher separation column efficiency; and meanwhile, after a mobile phase of the ion chromatography is inhibited by an electrolysis inhibitor, a matrix is water, and a stable high-molecular polymer exchange chromatographic column is matched, so that the baseline noise of the mass spectrum can be greatly reduced, higher sensitivity and analysis method specificity are obtained, and the detection requirements of the perchlorate in the tea leaves are met.

Description

technical field [0001] The invention belongs to the technical field of detection, and more specifically relates to a method for detecting perchlorate in tea. Background technique [0002] Perchlorate is a persistent toxic substance. After the human thyroid gland absorbs perchlorate, affected by it, it will reduce the absorption of iodine, which will disturb the metabolism and endanger human health. Long-term perchlorate intake, especially for pregnant women, embryos, and babies, is very harmful and should be paid attention to. [0003] The main sources of perchlorate pollution are aerospace, pyrotechnics manufacturing, arms industry, rubber products, fuel coatings, etc. Sources of perchlorate in tea include natural occurrence and man-made pollution, which may come from the soil used in the planting process, natural fertilizers, irrigation water, industrial discharge, etc., as well as the use of chlorine-containing disinfectants during processing and the migration of packag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96
CPCG01N30/96
Inventor 陈泽宇毛林夏郑洪国袁智
Owner 陈泽宇
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