Method for removing heavy metal lead and cadmium in gracilaria seaweed

A technology of heavy metals and Gracilaria, applied in the removal of heavy metals lead and cadmium from Gracilaria seaweed, and the field of removing heavy metals lead and cadmium, which can solve the problems that the research on heavy metal removal has not been reported yet

Inactive Publication Date: 2012-02-22
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the investigation and research work on the content of heavy metals in edible seaweeds on the market has been reported, but so far, the research on the removal of heavy metals in edible seaweeds on the market has not been reported

Method used

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  • Method for removing heavy metal lead and cadmium in gracilaria seaweed
  • Method for removing heavy metal lead and cadmium in gracilaria seaweed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] ① Take Gracilaria from Tiaoshun Island, Zhanjiang, and rinse it thoroughly with clear water to remove impurities such as sediment, broken shells, and insects in Gracilaria, rinse it, drain, and set aside;

[0022] ② Take 1000g of Gracilaria treated above, add 6 liters of 0.2mol / L citric acid solution to soak, make sure that Gracilaria is immersed in the liquid, the treatment temperature of citric acid solution is 30°C (room temperature), shake in water bath for 24 hours;

[0023] ③ The determination of heavy metal ions in this experiment was determined by graphite furnace atomic absorption spectrometry in GB17378.6~1998 "Marine Monitoring Specifications", and the measurement results are shown in the following table;

[0024]

[0025] GB2760~2005 limits of pollutants in food, lead in leafy vegetables ≤ 0.3mg / kg, cadmium ≤0.2mg / kg, Table 1 shows that neither cadmium nor lead in Gracilaria before treatment meets the limits of pollutants in GB2762~2005 in food Vegetable ...

Embodiment 2

[0030] ① Take Gracilaria from Tiaoshun Island, Zhanjiang, and rinse it thoroughly with clear water to remove impurities such as sediment, broken shells, and insects in Gracilaria, rinse it, drain, and set aside;

[0031] ② Take 1000g of Gracilaria treated above, add 6 liters of 18% acetic acid solution to soak, make sure that Gracilaria is immersed in the liquid, the treatment temperature of the acetic acid solution solution is 30°C (room temperature), and shake in a water bath for 24 hours;

[0032] ③ The determination of heavy metal ions in this experiment was determined by graphite furnace atomic absorption spectrometry in GB17378.6~1998 "Marine Monitoring Specifications". The measurement results are as follows:

[0033]

[0034] The concentration of Cd in Gracilaria algae samples before treatment was 0.2869 mg / kg, and the concentration of Cd in this test sample after treatment with 18% acetic acid was 0.0573 mg / kg, and the removal rate of Cd was 85.0%, which was a good r...

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Abstract

The invention relates to a method for removing heavy metal lead and cadmium in gracilaria seaweed. The method comprises the steps of flushing gracilaria clean with clear water, soaking the gracilaria in organic acid solution, performing water bath oscillation for 12 to 24 hours at the temperature ranging from 20 DEG C to 80 DEG C, fishing out, draining or washing the gracilaria to be neutral, and removing the heavy metal lead and cadmium in the gracilaria seaweed. By adopting the method, the removing effect of lead and cadmium in the gracilaria seaweed is remarkable, the removing rate of cadmium (Cd) is larger than 80%, and the removing rate of Palladium (Pd) is larger than 90%. Food acids are adopted by the method, products meet the edible hygienic standard after treatment, used organic acids can be degraded under the aerobic and anaerobic conditions, and secondary pollution is avoided. The gracilaria seaweed which does not meet the edible standard due to the fact that heavy metal lead and cadmium exceed the standard is changed to be safe to eat through organic acid treatment, and accordingly the method improves utilizing value of the gracilaria and has wide market prospect.

Description

technical field [0001] The invention relates to a method for removing heavy metal lead and cadmium, in particular to a method for removing heavy metal lead and cadmium in Gracilaria algae, belonging to the field of food processing. Background technique [0002] Gracilaria ( Gracilaria ), commonly known as "Asparagus", "Sea Vegetable", "Oyster Vegetable", belongs to red algae and is an important large-scale economical seaweed. Gracilaria is a natural and ideal health food raw material with high dietary fiber, high protein, low fat, low calorie, and rich in minerals and vitamins. Gracilaria also contains algal erythrin, phycocyanin, prostaglandin, hemagglutinin, water-soluble polysaccharides, antioxidants and other biologically active substances that are beneficial to the human body. It can be used as a diet food for obese patients, diabetes, high blood pressure, heart disease Health food for the sick. The application of Gracilaria is getting more and more attention fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L1/337A23L1/015A23L17/60A23L5/20
Inventor 潘江球李思东杨磊谢主兰张钰莹
Owner GUANGDONG OCEAN UNIVERSITY
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