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Method for measuring heavy metal Pb in aquatic product

A method of determination and technology of aquatic products, applied in the field of analytical chemistry, can solve problems such as endangering human health, failure to discharge, poisoning of aquatic organisms, etc., and achieve the effect of low cost and strong operability

Inactive Publication Date: 2017-02-22
防城港市质量技术监督局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Heavy metal enrichment exists in aquatic products, which will poison aquatic organisms, and then accumulate in the human body and cannot be excreted, endangering human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for assaying heavy metal Pb in aquatic products, comprising the following steps:

[0021] (1) make Pb standard solution curve;

[0022] (2) Dissect the aquatic product with a stainless steel knife, take the back muscle of the fish, grind it in a blender, and mix it to obtain the aquatic product sample;

[0023] (3) Take 100 g of aquatic product samples and put them into a beaker, add 5 mL of concentrated nitric acid, and heat and digest on a hot plate; the conditions for heating and digestion on a hot plate are: temperature 130°C, time 120 min;

[0024] (4) When the aquatic product sample is digested to 50g, add 5mL concentrated nitric acid and 2mL hydrogen peroxide, and continue to heat and digest on the electric heating plate;

[0025] (5) When the aquatic product sample is digested to 25g, take it down and cool it down. After cooling, add 2mL of 10% ammonium chloride and 10mL of 3mol / L HCl, put it into a colorimetric tube, and set the volume to 100mL. If th...

Embodiment 2

[0028] A method for assaying heavy metal Pb in aquatic products, comprising the following steps:

[0029] (1) make Pb standard solution curve;

[0030] (2) Dissect the aquatic product with a stainless steel knife, take the back muscle of the fish, grind it in a blender, and mix it to obtain the aquatic product sample;

[0031] (3) Take 100 g of aquatic product samples and put them into a beaker, add 5 mL of concentrated nitric acid, and heat and digest on a hot plate; the conditions for heating and digestion on a hot plate are: temperature 160°C, time 180 min;

[0032] (4) When the aquatic product sample is digested to 50g, add 5mL concentrated nitric acid and 2mL hydrogen peroxide, and continue to heat and digest on the electric heating plate;

[0033] (5) When the aquatic product sample is digested to 25g, take it down and cool it down. After cooling, add 2mL of 10% ammonium chloride and 10mL of 3mol / L HCl, put it into a colorimetric tube, and set the volume to 100mL. If th...

Embodiment 3

[0036] A method for assaying heavy metal Pb in aquatic products, comprising the following steps:

[0037] (1) make Pb standard solution curve;

[0038] (2) Dissect the aquatic product with a stainless steel knife, take the back muscle of the fish, grind it in a blender, and mix it to obtain the aquatic product sample;

[0039] (3) Take 100 g of aquatic product samples and put them into a beaker, add 5 mL of concentrated nitric acid, and heat and digest on a hot plate; the conditions for heating and digestion on a hot plate are: temperature 150°C, time 160 min;

[0040] (4) When the aquatic product sample is digested to 50g, add 5mL concentrated nitric acid and 2mL hydrogen peroxide, and continue to heat and digest on the electric heating plate;

[0041] (5) When the aquatic product sample is digested to 25g, take it down and cool it down. After cooling, add 2mL of 10% ammonium chloride and 10mL of 3mol / L HCl, put it into a colorimetric tube, and set the volume to 100mL. If th...

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Abstract

The invention relates to a method for measuring heavy metal Pb in an aquatic product. The method includes the steps of firstly, making a Pb standard solution curve; secondly, dissecting the aquatic product with a stainless steel knife, taking the back meat of fish, smashing in a stirrer, and evenly mixing to obtain an aquatic product sample; thirdly, taking 100g of the aquatic product sample, placing into a beaker, adding 5mL of concentrated nitric acid, and heating on an electric heating plate for decomposing; fourthly, when the aquatic product sample is decomposed to 50g, adding 5mL of concentrated nitric acid and 2mL of hydrogen peroxide, and heating on the electric heating plate for decomposing; fifthly, when the aquatic product sample is decomposed to 25g, taking down, cooling, adding 2mL of 10% ammonium chloride and 10mL of 3mol / L HCl after cooling, loading into a colorimetric cylinder, setting volume to 100mL, and filtering before measuring if the solution is turbid; sixthly, using an atomic absorption spectrometry method to perform measuring, recording the data result, substituting the measuring result into a Pb standard solution curve, and calculating to obtain the heavy metal Pb content in the aquatic product. The method can accurately measure the Pb content and is high in operability and low in cost.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a method for determining heavy metal Pb in aquatic products. Background technique [0002] Heavy metals refer to metals with a density above 5×103kg / m3, such as gold (Au), silver (Ag), mercury (Hg), copper (Cu), lead (Pb), cadmium (Cd), chromium (Pb), etc. . Some heavy metals enter the human body through food, interfere with the normal physiological functions of the human body, and endanger human health. They are called toxic heavy metals, mainly mercury, cadmium, chromium (Pb), lead, arsenic (As), zinc (Zn), tin (Sn) Wait. Among them, arsenic is originally a non-metallic element, but according to its chemical properties and in view of its toxicity, it is generally listed as a toxic heavy metal element. Human activities can easily cause heavy metal pollution in water quality. By eating aquatic products, people accumulate heavy metals in the human body and seriously damage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/44
CPCG01N21/3103G01N1/44
Inventor 李燕
Owner 防城港市质量技术监督局