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Method for determining concentration of heavy metal ion

A heavy metal ion and concentration technology, which is applied in the direction of chemical reaction of materials for analysis, chemiluminescence/bioluminescence, etc., can solve the problems of complex synthesis routes of polymers, large quenching constants, and high difficulty of synthesis, and achieve excellent solubility , Low production equipment requirements, good linear correlation effect

Inactive Publication Date: 2009-08-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the quenching constant is also very large, reaching 10 4 order of magnitude, but the synthesis routes of these polymers are very complicated, and the synthesis difficulty is quite high, and organic noble metal catalysts are also used in the synthesis process, which itself is also a polluting and energy-intensive process

Method used

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  • Method for determining concentration of heavy metal ion
  • Method for determining concentration of heavy metal ion
  • Method for determining concentration of heavy metal ion

Examples

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Embodiment 1

[0039] The following examples will illustrate that the poly(7-sulfonic acid-1-naphthylamine) of the present invention is in an aqueous solution system, adopts hydrogen peroxide / ferrous sulfate redox system to initiate polymerization, and realizes according to the chemical oxidation polymerization reaction path .

[0040] Accurately measure 6mL of water into a 50mL beaker, and then add 2mL of NaOH solution with a concentration of 1mol / L. Accurately weigh 446.5 mg (2 mmol) of 7-sulfonic acid-1-naphthylamine, and transfer it into the above aqueous alkali solution. Stir the blended system with a magnetic stirrer for 18 minutes to completely dissolve the monomer in the aqueous alkali solution, and then add 1 mL (0.05 mmol) of FeSO with a concentration of 50 mmol / L to the beaker. 4 Add 1ml (10mmol) hydrogen peroxide to the solution within about 5 minutes, at this time, the color of the solution changes from light gray to dark brown. The beaker was sealed and the reaction was conti...

Embodiment 2～7

[0042] The following examples will illustrate the influence of different oxygen single ratios on the polymerization yield in the present invention.

[0043] Repeat Example 1, change the amount of oxidant hydrogen peroxide added, so that the oxygen ratio is 1:1, 2:1, 3:1, 4:1, 8:1, 10:1. A black solid powder was obtained with yields of 15.8%, 21.7%, 23.7%, 25.3%, 87.6%, and 59.5%, respectively. The conductivity measured by tablet method is 2.12×10 -6 S / cm, 2.12×10 -6 S / cm, 2.20×10 -6 S / cm, 2.19×10 -6 S / cm, 1.25×10 -6 S / cm, 0.65×10 -6 S / cm.

Embodiment 8～10

[0045] The following examples illustrate the effect of reaction time on polymer yield in the present invention.

[0046] Example 1 was repeated, and the reaction time was changed so that the reaction time was 6h, 12h, and 28h respectively, and black solid powder was obtained with yields of 44.3%, 52.5%, and 81.4%, respectively. The conductivity measured by tablet method was 1.36×10 -6 S / cm, 1.45×10 -6 S / cm, 2.12×10 -6 S / cm.

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Abstract

The invention discloses a method for measuring the concentration of heavy metal ions. Mix with two or more known heavy metal ion aqueous solutions of different concentrations, and make the concentration of the polysulfonated naphthylamine in the mixed solution identical to the concentration in step a, measure the fluorescence luminous intensity value of a plurality of mixed solutions respectively and represent with I ; C, the I0 / I value is used as the ordinate, and the heavy metal ion concentration value is used as the abscissa, and a plurality of numerical values ​​are utilized to make a straight line to obtain the Stern-Volmer formula: b and in I0 / I=b+kc The value of k; d, the polysulfonated naphthylamine aqueous solution is mixed with the heavy metal ion solution to be measured, and the concentration of the polysulfonated naphthylamine in the mixed solution is the same as the concentration in step a, and the fluorescent luminescence of the mixed solution is measured For the intensity value, the concentration of heavy metal ions is obtained according to the Stern-Volmer formula of the aforementioned known b value and k value. The method of the invention can be used to determine the concentration of heavy metal ions.

Description

technical field [0001] The invention relates to a method for measuring the concentration of heavy metal ions. Background technique [0002] Water-soluble conjugated polymers are a new type of conductive polymers. Their rare water solubility makes them unique in the family of conductive polymers, and it also broadens a broader field for the practical application of conductive polymers. This is mainly due to the water solubility of this type of polymer often has better fluorescence properties. And it has a wide range of fluorescent light emission, all in the light emission interval of 410nm ~ 580nm. Different polymers have different fluorescence quantum efficiencies, ranging from 0.08 to 0.94. For example, the fluorescence quantum efficiency of poly-p-phenylene vinylene (PPV) derivatives is between 0.14 and 0.54 (Fan QL, Lu S, Lai Y H, Hou XY, Huang W. Synthesis, characterization, and fluorescence quenching of novel cationic phenyl -substituted poly(p-phenylenevinylene)s.Ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/76
Inventor 李新贵沈华军黄美荣
Owner TONGJI UNIV
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