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Method for unbalanced enrichment and measurement of ultra-trace lead and cadmium ions in beverage

A measurement method and technology for cadmium ions, which are applied in the measurement of color/spectral characteristics and the preparation of samples for testing, etc., can solve the problems of affecting the chemical form distribution of heavy metals, difficult to reflect the existing forms of heavy metals, and disrupting solution balance, etc., to improve immunity. , the effect of reducing the detection limit and reducing the interference of lead and cadmium measurement

Inactive Publication Date: 2016-08-03
BOHAI UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spectrophotometry, atomic spectroscopy, electrochemical voltammetry, etc. are not in-situ sampling and measurement. The sampling process and sample treatment destroy the balance of the solution and affect the chemical form distribution of heavy metals in the sample. The measurement results are difficult to reflect the actual existence of heavy metals. form
The ion-selective electrode only responds to specific free metal ions. It can measure the ion content in the solution in situ by potentiometric measurement without destroying the solution balance. It has the advantages of fast, sensitive, and simple equipment. The disadvantage is that the detection limit is relatively low. High, the concentration of heavy metal ions in most liquid drinks is lower than its response range, which limits the application of this method

Method used

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  • Method for unbalanced enrichment and measurement of ultra-trace lead and cadmium ions in beverage

Examples

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Effect test

Embodiment 1

[0033] 1) Take a cellulose acetate membrane with a molecular weight cut-off of 2000-12000 as a dialysis membrane, soak it in deionized water and boil to pretreat the cellulose acetate membrane, change the water every 20 minutes, and the cumulative boiling time is 2 hours;

[0034] 2) Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, put the binder water-soluble sodium alginate into the dialysis bag, soak and purify in deionized water for 12 hours;

[0035] 3) Prepare the purified binding agent into a 0.002mol / L sodium alginate aqueous solution, and take 3 acquisition devices made of polypropylene with a volume of 2mL, such as figure 1 As shown, the acquisition device includes a fixed plate 1, on which a shell 2 with an inner edge is provided, a support body 3 is arranged in the shell 2, and a The dialysis membrane 4 is provided with an inverted tapered groove 301 on the support body 3, and the groove 301 and the dialysis membrane 4 are surrounded...

Embodiment 2

[0039] 1) Take a cellulose acetate membrane with a molecular weight cut-off of 2000-12000 as a dialysis membrane, soak it in deionized water and boil to pretreat the dialysis membrane, change the water every 20 minutes, and the cumulative boiling time is 1 hour;

[0040] 2) Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, put the binder water-soluble sodium alginate into the dialysis bag, soak in deionized water for 72 hours for purification, and change the water every 24 hours;

[0041] 3) The purified binding agent is made into a 0.005mol / L sodium alginate aqueous solution, and three collection devices whose material is polypropylene and have a volume of 2mL are the same as in Example 1; L sodium alginate aqueous solution, seal the device with the cellulose acetate membrane pretreated in step 1), put the dialysis membrane of the device downward, hang it on the support and float in the juice drink for 120h, take out all 3 collection devices at a...

Embodiment 3

[0045] 1) Take a cellulose acetate membrane with a molecular weight cut-off of 2000-12000 as a dialysis membrane, soak it in deionized water and boil to pretreat the dialysis membrane, change the water every 30 minutes, and the cumulative boiling time is 3 hours;

[0046] 2) Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, put the binder water-soluble sodium alginate into the dialysis bag, soak in deionized water for 36 hours for purification, and change the water every 18 hours;

[0047] 3) The purified binding agent is made into a 0.005mol / L sodium alginate aqueous solution, and three collection devices whose material is polypropylene and have a volume of 2mL are the same as in Example 1; L sodium alginate aqueous solution, seal the device with the cellulose acetate membrane pretreated in step 1), put the device dialysis membrane downward, hang it on the support and float in the wine for 48 hours, take out all 3 collection devices at a time, T...

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Abstract

A non-equilibrium enrichment and measurement method for ultra-trace lead and cadmium ions in beverages. A dialysis bag is made of cellulose acetate dialysis membrane, and the binder sodium alginate is put into the dialysis bag, soaked and purified in deionized water; the purified The sodium alginate solution was made into a solution, and the sodium alginate solution was taken according to the volume of the collection device and put into the collection device, and the collection device was sealed with cellulose acetate dialysis membrane, and after enrichment and sampling in a liquid drink, the concentration of the binder was determined. The cumulative amount of lead ions and cadmium ions, and finally calculate the concentration of heavy metal cations in the drink. The advantages are: the method can in-situ non-equilibrium separation and enrichment of lead ions and cadmium ions in beverages, reduce matrix interference, and accurately measure ultra-trace lead ions and cadmium ions in liquid beverages.

Description

technical field [0001] The invention belongs to the field of food safety, in particular to a method for non-equilibrium enrichment and measurement of ultra-trace lead and cadmium ions in drinks. Background technique [0002] In recent years, with the rapid development of my country's economy, the problem of environmental pollution has become increasingly prominent. The pollution of water, soil and sediment by heavy metals has become very common, which in turn poses a serious threat to my country's food safety. The biological toxicity of heavy metals is not only related to their total amount, but also depends on their morphological distribution to a greater extent. Studies have shown that the bioavailability of heavy metals is closely related to the concentration of free metals. Due to the complex composition of food, there may be a large amount of organic matter such as amino acids, sugars, organic acids, and pigments, and there may be inorganic matter such as high-concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N21/31
CPCG01N1/28G01N21/31
Inventor 陈宏王悦励建荣赵刚蔡艳荣
Owner BOHAI UNIV
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