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Reagent for lead concentration determination and method of determining lead concentration

A determination method and technology of lead concentration, applied in chemical method analysis, measuring device, analysis using chemical indicators, etc.

Inactive Publication Date: 2009-08-12
KOWA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is useful for the determination of lead concentration using the absorbance method when the interfering substance is calcium ions, but it is not suitable for the case where the interfering substance is zinc ions

Method used

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  • Reagent for lead concentration determination and method of determining lead concentration
  • Reagent for lead concentration determination and method of determining lead concentration
  • Reagent for lead concentration determination and method of determining lead concentration

Examples

Experimental program
Comparison scheme
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Embodiment

[0080] Hereinafter, examples are given to illustrate the present invention in further detail, but the present invention is not limited to these examples.

reference example 1

[0081] Reference Example 1 Synthesis of Polymer Introduced with Porphyrin Core

[0082] 91.1 mg of protoporphyrin IX disodium salt and 35.6 g of acrylamide were dissolved in dimethyl sulfoxide (DMSO) to make the total amount 490 mL. Move it into a three-necked flask, add 10 mL of 500 mmol / L azobisisobutyronitrile (AIBN), and quickly close the stopper. While stirring under a nitrogen atmosphere, the three-necked flask was immersed in a water bath adjusted to 60° C. to start polymerization. After 4 hours, the obtained polymerization solution was added dropwise to a large amount of methanol as a precipitating agent. The aggregated and precipitated polymer is recovered, and the polymer introduced with porphyrin core is isolated. After dissolving in pure water, it was added to methanol again to refine it.

Embodiment 1

[0083] Embodiment 1 Selection of masking agent

[0084] Dissolve the porphyrin core-introduced polymer in ultrapure water so that the absorbance at 466 nm when diluted twice (the blank is water) is between 0.7 and 0.8. This solution was mixed with a 1 mol / L calcium chloride solution at a ratio of 64:1 to obtain a reagent for measuring lead concentration containing a porphyrin polymer.

[0085] As test water, a lead-zinc mixed solution having a pH of 12 with a lead and zinc content of 2.5 μmol / L and a CAPS buffer was prepared.

[0086] 250 μL of a reagent for measuring lead concentration containing a porphyrin polymer diluted 10 times with pure water, 250 μL of a lead-zinc mixed solution, and 25 μL of various chelating agent solutions of various concentrations (100 mM or less) shown in Table 1 were mixed. The pH of the solution after mixing is 10-12.5. After heating at 75°C for 5 minutes, the absorption spectrum was measured using a UV-Vis spectrophotometer. Similarly, the a...

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Abstract

To provide a lead concentration determination reagent which realizes accurate determination of the lead concentration of a sample solution in a simple manner with safety, even when the sample solution contains zinc ions, and a lead concentration determination method making use of the reagent. The lead concentration determination reagent contains (A) a porphyrin derivative and (B) at least one species selected from among ethylenediamine-N,N'-dipropionic acid, ethylenediamine-N,N'-diacetic acid, and 1,6-diaminohexane-N,N,N',N'-tetraacetic acid.

Description

technical field [0001] The present invention relates to a reagent for measuring lead concentration for accurately measuring the concentration of lead in a sample solution in which zinc ions coexist, and a method for measuring lead concentration using the reagent. Background technique [0002] Since lead is a soft and easy-to-work metal, it was widely used as a material for water pipes in Japan until the 1970s. It was previously thought that lead could form an oxide film on the surface, so it was difficult to dissolve. However, after the 1980s, the problem of its trace dissolution has been paid attention to, and water supply companies have gradually replaced lead water pipes with stainless steel pipes. It is known that even a trace amount of lead is highly toxic to the human body, showing nervous system disorders, or poisoning symptoms such as anemia, headache, loss of appetite, and lead colic. [0003] In addition, lead is also used in lead storage batteries, glass-ceramic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N31/22G01N21/77
CPCG01N31/22G01N21/77
Inventor 浅野贵春藪崎克己水品惠一
Owner KOWA CO LTD
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