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Detection method of trace methylmercury in alga

A detection method, the technology of methylmercury, which is applied in the field of analytical chemistry and food safety detection, can solve the problems of loss, expensive, cumbersome operation, etc., and achieve the effect of high accuracy, convenient operation and wide detection range

Inactive Publication Date: 2015-03-11
DONGCHEN LEADER TESTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The steps of these pretreatment methods are cumbersome and easy to lose in the process of processing.
The cold trap capture method is currently the most reliable method, but in addition to the cumbersome operation, the method also uses expensive ethylating reagents

Method used

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  • Detection method of trace methylmercury in alga

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Ultrasonic extraction of methylmercury

[0037] Wash commercially available seaweed with clean water, air-dry, grind, pass through a 100-mesh sieve, and add 2wt% HNO 3 solution, then placed in an ultrasonic cleaner, heated to 50°C, ultrasonically treated for 30 minutes, taken out and left to cool, and centrifuged to obtain a seaweed sample solution for later use;

[0038] (2) Drawing of standard curve

[0039] The 1g / L methylmercury standard stock solution was mixed with HNO 3 Dilute the solution to 10mg / L standard application solution, pipette 0mL, 1mL, 2 mL, 4 mL, 10 mL, 20 mL and 30mL standard application solution into a 50ml volumetric flask, and use HNO 3 Dilute the solution to volume and shake well to obtain the standard solution series with concentration C of 0mg / L, 0.4mg / L, 0.8mg / L, 2mg / L, 4mg / L and 6mg / L respectively;

[0040] (3) Determination of methylmercury content by flame atomic absorption spectrometry

[0041] Using a mercury hollow cathode lamp,...

Embodiment 2

[0056] The difference from Example 1 is only in step (1).

[0057] (1) Ultrasonic extraction of methylmercury

[0058] Wash commercially available seaweed with clean water, air-dry, grind, pass through a 300-mesh sieve, and add 2wt% HNO 3 solution, then placed in an ultrasonic cleaner, heated to 55°C, ultrasonically treated for 20 minutes, taken out and left to cool, and centrifuged to obtain a seaweed sample solution for later use;

[0059] Steps (2) and (3) are the same as in Example 1.

[0060] The absorbance of the sample solution is: 0.061, and the concentration of methylmercury in the sample solution can be obtained as 0.454mg / L.

[0061]

Embodiment 3

[0063] The difference from Example 1 is only in step (1).

[0064] (1) Ultrasonic extraction of methylmercury

[0065] Wash commercially available seaweed with clean water, air-dry, grind, pass through a 300-mesh sieve, and add 2wt% HNO 3 solution, then placed in an ultrasonic cleaner, heated to 60°C, ultrasonically treated for 30 minutes, taken out and left to cool, and centrifuged to obtain a seaweed sample solution for later use;

[0066] Steps (2) and (3) are the same as in Example 1.

[0067] The absorbance of the sample solution is: 0.058, and the concentration of methylmercury in the sample solution can be obtained as 0.431mg / L.

[0068]

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Abstract

The invention provides a detection method of trace methylmercury in alga. The detection method comprises the following steps: (1) ultrasonic extraction of methylmercury; (2) drawing of a standard curve; (3) measurement of the content of methylmercury in a standard solution and a sample solution by adopting the flame atomic absorption spectrometry. The content of trace methylmercury is measured by the combination of the ultrasonic extraction and the flame atomic absorption spectrometry, the detection range is wide, methylmercury with the concentration of 0-4 mg / L can be detected, and the detection method has relatively high accuracy, besides, is convenient, fast, simple and safe in operation, and is suitable for industrial application.

Description

technical field [0001] The invention relates to the fields of analytical chemistry and food safety detection, in particular to a method for detecting trace amounts of methylmercury in seaweed. [0002] Background technique [0003] Mercury is an extremely toxic and accumulative heavy metal pollutant. It exists in the form of metallic mercury, inorganic mercury and organic mercury in nature. Methylmercury is the main form of organic mercury and is an environmental pollutant with neurotoxicity. , mainly invades the central nervous system, can cause language and memory impairment, etc., and its toxicity is hundreds of times that of other mercury compounds. To date, only methylmercury has often been detected in actual samples. In addition, inorganic mercury in the environment can be gradually methylated under the action of organisms (especially microorganisms) and converted into highly toxic methylmercury. Therefore, research on the content of methylmercury in food (especiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/34
Inventor 熊开胜张海防谢建庭
Owner DONGCHEN LEADER TESTING
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