Detection method of lead ion

A detection method, lead ion technology, applied in the field of ion detection, can solve the problems of poor stability, strong toxicity, expensive reagents, etc., and achieve the effect of less sampling, low detection cost, and simple and convenient operation

Active Publication Date: 2012-03-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has a simple reaction, detects lead ions by changing color, and has a fast detection sp

Method used

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  • Detection method of lead ion
  • Detection method of lead ion
  • Detection method of lead ion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Detection of lead ions in water samples

[0027] 1) Prepare lead ion aqueous solutions of different concentrations:

[0028] Mix lead nitrate with ultrapure water to prepare 4×10 -7 M (mol / L) C1 solution, the concentration is 2×10 -6 C2 solution of M at a concentration of 8×10 -6 D1 solution of M at a concentration of 2 × 10 -5 D2 solution of M at a concentration of 4×10 -5 D3 solution of M at a concentration of 8×10 -5 E1 solution of M at a concentration of 1.2×10 -4 E2 solution of M at a concentration of 1.6×10 -4 E3 solution of M at a concentration of 2 x 10 -4 F1 solution of M at a concentration of 4 × 10 -4 F2 solution of M.

[0029] 2) Preparation of detection solution

[0030] Take 6mL of 5mmol / L chloroauric acid aqueous solution and add it to 100mL of deionized water, add 20mmol / L cetyltrimethylammonium bromide aqueous solution 4mL under stirring conditions, and then slowly add freshly prepared 3 mL of sodium borohydride aqueous solution with a concen...

Embodiment 2

[0044] Detection of lead ions in blood samples

[0045] 1) Preparation of detection solution

[0046] The procedure is the same as the preparation of the detection solution in Example 1, except that dodecyltrimethylammonium bromide is substituted for hexadecyltrimethylammonium bromide.

[0047] 2) Processing of blood samples

[0048] Add 3mol / L nitric acid aqueous solution to completely oxidize the organic components in the blood sample. The volume ratio of nitric acid aqueous solution to blood is 1:5, then drop 0.1mol / L sodium hydroxide to neutrality, and filter the obtained filtrate. for pretreated blood samples.

[0049] 3) Detection of lead ions in blood samples

[0050] First, take 5 mL of the gold nanoparticle detection solution prepared in Example 2, and then adjust the pH value to 8.5 with 0.1 mol / L sodium hydroxide aqueous solution to obtain a gold nanoparticle detection solution with a pH value of 8.5.

[0051] Subsequent steps are the same as the detection of le...

Embodiment 3

[0053] Detection of lead ions in food

[0054] The preparation process of the detection solution is the same as in Example 1, except that trioctylmethylammonium chloride replaces hexadecyltrimethylammonium bromide.

[0055] Dissolve the food to be tested in water to obtain a food sample, add concentrated nitric acid with a concentration of 98% to the food sample, the volume ratio of concentrated nitric acid to the food sample is 1:1, so that the organic components in the food sample are completely oxidized, and then Add 0.1mol / L sodium hydroxide dropwise to neutrality, and filter the obtained filtrate to be the pretreated food sample. Other operations are roughly the same as step 3) in Example 2, except that the pH value of the detection solution is adjusted to 10.

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Abstract

The invention relates to a detection method of a lead ion. The method is characterized by comprising the steps of: adding a chloroauric acid water solution into deionized water, adding a cationic surfactant water solution under magnetic stirring, then slowly adding a newly prepared reductant water solution dropwisely, conducting magnetic stirring for 30min under room temperature, thus obtaining asurfactant modified Au nanoparticle detection liquid; taking two parts of the detection liquid in an equivalent amount; adding two parts of a thiosulfate water solution of an equivalent volume into the two detection liquids respectively, and shaking them uniformly so as to obtain a first mixed solution and a second mixed solution; adding ultrapure water and a solution to be detected in an equivalent volume into the first mixed solution and the second mixed solution respectively, mixing them well so as to form a third mixed solution and a fourth mixed solution; comparing the color change of the third mixed solution and the fourth mixed solution so as to determine whether existing a lead ion in the detected solution. The thiosulfate can be sodium hyposulfite or potassium thiosulfate. The method provided in the invention has the advantages of simple, convenient and rapid operation, low detection cost, small sampling amount and wide application scope.

Description

technical field [0001] The invention relates to the field of ion detection, in particular to a detection method for lead ions. Background technique [0002] With the development of industrial technology, various pollution problems, especially heavy metal pollution, are becoming more and more serious. According to statistics, a total of 31 heavy metal pollution incidents occurred across the country in the two years from 2009 to 2010; the Ministry of Land and Resources has publicly stated that 12 million tons of grain in China are polluted by heavy metals every year, and the direct economic loss exceeds 20 billion yuan; in January 2011, Anhui The outbreak of children's "excessive blood lead" incident in Huaining is a wake-up call for people. There are many industries involved in heavy metal emissions, including mining, metal smelting, chemicals, electroplating, leather, pesticides, feed, and IT industries. A large part of heavy metal pollutants enter ponds, rivers, lakes and...

Claims

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Application Information

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IPC IPC(8): G01N1/38G01N21/78G01N21/33
Inventor 张玉杰吴爱国
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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