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Method for determining trace copper, trace zinc and trace iron in mineral water through ion pair-cloud point extraction- cloud point extraction-flame atomic absorption spectrometry

A flame atomic absorption and spectrometry technology, which is applied in the measurement of color/spectral characteristics and the preparation of samples for testing, can solve problems such as the reduction of extraction efficiency, and achieve high accuracy, low detection limit, and good enrichment effect. Effect

Inactive Publication Date: 2015-12-09
GUANGDONG PHARMA UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this reagent is prone to binding non-target cations in the pre-concentration step, resulting in a decrease in extraction efficiency

Method used

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  • Method for determining trace copper, trace zinc and trace iron in mineral water through ion pair-cloud point extraction- cloud point extraction-flame atomic absorption spectrometry
  • Method for determining trace copper, trace zinc and trace iron in mineral water through ion pair-cloud point extraction- cloud point extraction-flame atomic absorption spectrometry
  • Method for determining trace copper, trace zinc and trace iron in mineral water through ion pair-cloud point extraction- cloud point extraction-flame atomic absorption spectrometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Determination of metal ion content in standard solution:

[0047] Accurately pipette the standard solution (0.25mL Cu 2+ 10μg / mL, 0.1mL Zn 2+ 10μg / mL, 0.1mLFe 3+ 100μg / mL) into a 50mL centrifuge tube, add 0.8mL of 5% (v / v) TritonX-114 solution, 0.4mL of 0.01mmol / L 5-Br-PADAP-TPB solution, 2.0mL buffer (Cu 2+ , Zn 2+ , Fe 3+ There are buffer systems respectively 6, 7, and 4), and dilute to 50 mL with triple-distilled water. Tighten the cap of the centrifuge tube, shake well, place in a constant temperature water bath at 40°C, heat for 15 minutes, take it out, and immediately place it in a centrifuge while it is still hot and centrifuge at 3500r / min for 10 minutes. After the centrifugation, take it out, put it in an ice-water bath to cool for 10 minutes, make the enriched phase become a viscous liquid phase, discard the water phase and add 10% HNO 3 After the methanol reduces the viscosity of the rich phase, set the volume to 1mL, and measure according to the foll...

Embodiment 2

[0052] The standard solution in Example 1 of the same batch was used, except that the amount of TritonX-114 solution was 0.4 ml, and the amount of 5-Br-PADAP-TPB was 0.1 ml.

Embodiment 3

[0054] The standard solution in Example 1 of the same batch was used, except that the amount of TritonX-114 solution was 1.2 ml, and the amount of 5-Br-PADAP-TPB was 1 ml.

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Abstract

The present invention provides a method for determining trace copper, trace zinc and trace iron in mineral water through ion pair-cloud point extraction- cloud point extraction-flame atomic absorption spectrometry. The method comprises: S1, adding a surfactant solution, a 5-Br-PADAP-TPB positive 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol-tetraphenylboron sodium solution and a proper amount of a buffer solution to a sample, and carrying out volume metering with water; S2, heating the mixture obtained in the S1, and carrying out centrifugation while hot; and S3, after completing the centrifugation, placing in an ice water bath, cooling, discarding the water phase, adding a diluent, and detecting by using a flame atomic absorption spectrometry method. According to the method of the present invention, the copper detection limit, the zinc detection limit and the iron detection limit respectively are 0.444 [mu]g / L, 0.135 [mu]g / L and 0.779 [mu]g / L.

Description

technical field [0001] The invention belongs to the technical field of food detection, and more specifically relates to a method for determining trace amounts of copper, zinc and iron in mineral water by ion pair-cloud point extraction-flame atomic absorption spectrometry. Background technique [0002] Although trace elements only account for 0.01% of body weight, they are related to the health of life. Copper, zinc and iron are extremely important to the healthy development of the human body. However, their intake is only required at trace levels, and excessive intake of the above trace elements can cause adverse health effects. Living water is one of the main sources for the human body to absorb trace elements. With the development of modern industry and agriculture, the problem of mineral water sources being polluted has become more and more prominent. In the purification process of mineral water, inorganic pollutants are often not effectively removed. Therefore, the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
Inventor 王梅钟怡洲杨冰仪张泽华邹志辉
Owner GUANGDONG PHARMA UNIV
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