Method for measuring content of nitrite in edible salt

A technology of nitrite and determination method, which is applied in the field of determination of nitrite content in table salt, can solve the problems of needing large instruments, interference, and high analysis cost, and achieve high recovery accuracy, improved result accuracy, and precise detection high degree of effect

Active Publication Date: 2017-09-05
YIYANTANG YINGCHENG HEALTH SALT MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the better methods for measuring nitrite include derivative ultraviolet photometry, ion chromatography ultraviolet photometry, gas molecular absorption photometry, etc. These methods can accurately measure trace NO 2 - , but all require large instruments and high analysis costs
So far, the country has only established the determination method of nitrite in food diazo coupling photometry (GB / T 5009.33-2008), but the determination of nitrite content in table salt has not yet established an industry standard analysis method, and due to existing Nutrient-specific salt and other products are becoming more and more market-oriented. Many metal ions and mineral elements in table salt, as well as potassium iodate, a commonly used additive in table salt, are likely to cause serious problems when the nitrite content is detected by diazo coupling photometry. Large interference makes the accuracy of the nitrite content measured by this method not high, and the recovery rate and precision cannot be guaranteed

Method used

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  • Method for measuring content of nitrite in edible salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dispose of salt solution as follows:

[0022] (1) Preparation of salt sample solution: pipette 10 g of salt sample, dissolve it in 100 mL of deionized water, and prepare a salt solution with a concentration of 0.1 g / mL;

[0023] (2) Flow the above salt solution through Chelex-100 resin at a flow rate of 1.2mL / min, the particle size of the resin is 100-200 mesh, the diameter of the resin layer is 3mm, the height of the resin layer is 6cm, and the filtrate I is collected;

[0024] (3) Flow the filtrate I through a 732-type cation exchange resin at a flow rate of 1.5 mL / min, the resin particle size is 100-150 mesh, the diameter of the resin layer is 4 mm, and the height of the resin layer is 7 cm to collect the filtrate II;

[0025] (4) Flow the filtrate II through maleic rosin glyceryl acrylate macroporous adsorption resin at a flow rate of 2.0mL / min, the particle size of the resin is 60-100 mesh, the diameter of the resin layer is 5mm, and the height of the resin layer i...

Embodiment 2

[0035] Dispose of salt solution as follows:

[0036] (1) Prepare salt sample solution: pipette 20g salt sample, dissolve it with 200mL deionized water, and prepare a salt solution with a concentration of 0.1g / mL;

[0037] (2) Flow the above salt solution through Chelex-100 resin at a flow rate of 1.2mL / min, the particle size of the resin is 100-200 mesh, the diameter of the resin layer is 6mm, the height of the resin layer is 8cm, and the filtrate I is collected;

[0038] (3) Flow the filtrate I through a 732-type cation exchange resin at a flow rate of 1.5 mL / min, the resin particle size is 100-150 mesh, the diameter of the resin layer is 7 mm, and the height of the resin layer is 9 cm to collect the filtrate II;

[0039] (4) Flow the filtrate II through maleic rosin glyceryl acrylate macroporous adsorption resin at a flow rate of 2.0mL / min, the particle size of the resin is 60-100 mesh, the diameter of the resin layer is 8mm, and the height of the resin layer is 10cm to coll...

Embodiment 3

[0042] Dispose of salt solution as follows:

[0043] (1) Prepare salt sample solution: pipette 15g salt sample, dissolve it with 150mL deionized water, and prepare a salt solution with a concentration of 0.1g / mL;

[0044] (2) Flow the above salt solution through Chelex-100 resin at a flow rate of 1.2mL / min, the particle size of the resin is 100-200 mesh, the diameter of the resin layer is 5mm, the height of the resin layer is 7cm, and the filtrate I is collected;

[0045] (3) Flow the filtrate I through the 732-type cation exchange resin at a flow rate of 1.5 mL / min, the resin particle size is 100-150 mesh, the diameter of the resin layer is 6 mm, and the height of the resin layer is 8 cm to collect the filtrate II;

[0046] (4) Flow the filtrate II through maleic rosin glyceryl acrylate macroporous adsorption resin at a flow rate of 2.0mL / min, the particle size of the resin is 60-100 mesh, the diameter of the resin layer is 6mm, and the height of the resin layer is 8cm to col...

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Abstract

The invention provides a method for measuring content of nitrite in edible salt. The method includes following steps: (1), preparing an edible salt sample : using deionized water to dissolve an edible salt sample to prepare an edible salt solution of 0.1m / mL in concentration; (2), enabling the edible salt solution to flow through EDTA-type chelated resin at a flowing speed of 1.2mL / min, and collecting filtrate I; (3), enabling the filtrate I to flow through 732-type cation exchange resin at a flowing speed of 1.5mL / min, and collecting filtrate II; (4), enabling the filtrate II to flow through maleic rosin acrylic glyceride macroporous adsorption resin, and collecting filtrate III; (5), adopting diazo coupling spectrophotometry to detect nitrite ions in the filtrate III. The method can well eliminate interference caused by metal ions, mineral elements and other additives in the edible salt and has the advantages of accurate detection result, high recovery rate and high precision.

Description

technical field [0001] The invention belongs to the technical field of food safety detection, and in particular relates to a method for determining the content of nitrite in table salt. Background technique [0002] The food industry is a lifeline industry related to the national economy and people's livelihood, and it is also an important symbol of a country's economic development level and people's quality of life. Food safety is closely related to people's life and property. Edible salt industry, as an important branch of the food industry, is a kind of seasoning widely used in food and a necessity in people's life. Its quality directly affects people's life and health. [0003] Nitrite (NO 2 - ) As a food preservative and coloring agent, it can improve the color and taste of food, but nitrite is a strong oxidant. After entering the human body, it can oxidize low iron hemoglobin in the blood into methemoglobin, and lose the function of transporting oxygen. Cause tissu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 张红宇谢成军秦雪莲袁成琳
Owner YIYANTANG YINGCHENG HEALTH SALT MFG
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