CN102356892A - Method for removing heavy metal lead and cadmium in gracilaria seaweed - Google Patents
Method for removing heavy metal lead and cadmium in gracilaria seaweed Download PDFInfo
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- CN102356892A CN102356892A CN2011102875502A CN201110287550A CN102356892A CN 102356892 A CN102356892 A CN 102356892A CN 2011102875502 A CN2011102875502 A CN 2011102875502A CN 201110287550 A CN201110287550 A CN 201110287550A CN 102356892 A CN102356892 A CN 102356892A
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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
The present invention relates to a kind of method of removing heavy metal lead and cadmium, be specifically related to a kind of method of removing fragrant plant mentioned in ancient texts marine alga heavy metal lead and cadmium, belong to food processing field.
Background technology
Fragrant plant mentioned in ancient texts (
Gracilaria) be commonly called as " asparagus ", " edible seaweed ", " oyster dish ", belong to red algae, be important large-scale economic type marine alga.The fragrant plant mentioned in ancient texts algae is a kind of high dietary-fiber, high protein, low fat, low heat energy and the natural desirable healthy food material that is rich in minerals and vitamins.Contain also in the fragrant plant mentioned in ancient texts that the marine alga red eggs are white, phycocyanin, prostaglandin, hemagglutinin, water-soluble polysaccharide, polyphenoils etc. are to human body beneficial's bioactivator, can be used as diet food, diabetes, the hypertension of adiposis patient, cardiac's health food.The application of fragrant plant mentioned in ancient texts algae more and more receives food scholar, nutritionist's attention.Yet along with the burning of using, contain heavy metal coal, oil that contains the heavy metal agricultural chemicals; Contain a large amount of dischargings of heavy metal industry (plating, process hides, dyestuff and anticorrosion etc.) waste water; Heavy metal is more and more serious to the particularly hydrobiological pollution of environment, has caused people's great concern.Polysaccharide in the fragrant plant mentioned in ancient texts alginic cell wall is very strong to the accumulation ability of heavy metal, and many countries are a kind of important indicant of fragrant plant mentioned in ancient texts eutrophication as the marine pollution degree.Marine alga is as edible, and poisonous lead, mercury, cadmium etc. possibly cause the problem of potential hazard to become the focus of people's extensive concern in the marine alga.If this problem can not get solving and will inevitably restrict the fragrant plant mentioned in ancient texts frond and on edible, health food, must use.Heavy metal pollution problem how to remove the fragrant plant mentioned in ancient texts marine alga has become the focus of current scientific research.
At present, what report morely is the heavy metal removal in Chinese medicine and the water body, does not appear in the newspapers for the heavy metal removal method of edible seaweed.At present, to the existing report of the enquiry based work of content of beary metal in the edible seaweed on the market, but up to now, the research that heavy metal in the edible seaweed class on the market is removed does not appear in the newspapers as yet.
Summary of the invention
The heavy metal lead and the cadmium removal method that the purpose of this invention is to provide a kind of edible fragrant plant mentioned in ancient texts marine alga ready-to-eat food are handled through organic acid, make the fragrant plant mentioned in ancient texts marine alga reach the standard of edible safety.
The object of the invention can be realized the heavy metal removal of edible fragrant plant mentioned in ancient texts marine alga as ready-to-eat food through following technological measure:
Through with the fragrant plant mentioned in ancient texts marine alga at ambient temperature cleaning and removing impurity, acid treatment obtain the fragrant plant mentioned in ancient texts marine alga of edible safety, can be directly as the ready-to-eat food raw material;
The preliminary treatment of a, raw material: select the few fragrant plant mentioned in ancient texts of impurity, fully wash, remove and be entrained in impurity such as the silt in the fragrant plant mentioned in ancient texts, broken shell, insect with the thread clear water, the clean back of rinsing draining, for use;
B, the fragrant plant mentioned in ancient texts frond that rinsing is clean are put into certain density organic acid soln, and the consumption of solution was advisable to soak frond, and the part by weight of frond and solution is 1:5 ~ 8; Frond heavily is a weight in wet base; Soak, guarantee that fragrant plant mentioned in ancient texts is dipped under the liquid, 20 ℃ ~ 40 ℃; Water-bath was vibrated 12 ~ 24 hours, pulled, drains the fragrant plant mentioned in ancient texts marine alga of (or washing is to neutral) can be removed heavy metal lead and cadmium out;
Fragrant plant mentioned in ancient texts raw material described in the above-mentioned steps a can be dried product or the fresh fragrant plant mentioned in ancient texts of fragrant plant mentioned in ancient texts;
Frond in frond described in the above-mentioned steps b and the acid solution ratio is the weight in wet base after fresh fragrant plant mentioned in ancient texts is cleaned back weight in wet base or the abundant soaking and washing of dried fragrant plant mentioned in ancient texts;
Organic acid described in the above-mentioned steps b is citric acid or acetic acid;
The solution molar concentration of the citric acid described in the above-mentioned steps b is 0.1 mol/L ~ 0.3mol/L, and mass percent concentration is 1.9% ~ 6.0%, and treatment temperature is 20 ℃ ~ 40 ℃, water-bath vibration 12 ~ 24 hours;
The solution molar concentration of the acetic acid described in the above-mentioned steps b is 0.5 mol/L ~ 5mol/L, and mass percent concentration is 3% ~ 18.0%, and treatment temperature is 20 ℃ ~ 40 ℃, water-bath vibration 12 ~ 24 hours.
The present invention has following advantage:
It is remarkable that lead in the fragrant plant mentioned in ancient texts algae of the present invention and cadmium get removal effect, and the Cd clearance can be greater than 90%, and the Pd clearance can be greater than 95%;
The used organic acid of the present invention is citric acid or acetic acid, and the removal process can be carried out under the acid condition of gentleness, and these two kinds of acid are food acid, and the product after the processing meets food sanitation standard;
The used organic acid of the present invention is citric acid or acetic acid, under aerobic and anaerobic conditions, all can degrade, and can not cause secondary pollution;
The used organic acid of the present invention is citric acid or acetic acid, belongs to food and uses metal ion chelation agent, and complexing power is medium, can select cationic ion-exchange resin for use, exchanges with the heavy metal of removing in the liquid, and citric acid or acetic acid can reuse.
The specific embodiment
Through embodiment the present invention is explained further details below, these embodiment only are used for explaining the present invention, do not limit the scope of the invention.
Embodiment 1
1. get Zhanjiang and transfer, fully wash, remove and be entrained in impurity such as the silt in the fragrant plant mentioned in ancient texts, broken shell, insect with the thread clear water along the thin fragrant plant mentioned in ancient texts in island, the clean back of rinsing draining, subsequent use;
2. get the above fragrant plant mentioned in ancient texts 1000g that handles well, add 6 liters of immersions of citric acid solution of 0.2mol/L, guarantee that fragrant plant mentioned in ancient texts is dipped under the liquid, the citric acid solution treatment temperature is 30 ℃ (room temperatures), water-bath vibration 24 hours;
3. this experiment heavy metal ion is measured and is adopted GBl7378.6 ~ 1998 " marine monitoring standard " to measure with GFAAS, measures result such as following table;
The pollutant middle period vegetables ekalead≤0.3mg/kg that limits the quantity of in GB2760 ~ 2005 food; Cadmium≤0.2mg/kg; Table 1 shows; Fragrant plant mentioned in ancient texts frond cadmium before handling and lead all do not meet the vegetables standard during pollutant is limited the quantity of in GB2762 ~ 2005 food, meet the vegetables standard during pollutant is limited the quantity of in GB2762 ~ 2005 food after the processing.
Cd concentration reaches 0.3837 mg/kg before handling in the fragrant plant mentioned in ancient texts algae sample, is 0.0359 mg/kg through the Cd concentration after the citric acid treatment of 0.2 mol/L in this test specimen, and the Cd clearance is 90.6%, and removal effect is better.
Pd concentration reaches 4.9230 mg/kg before handling in the fragrant plant mentioned in ancient texts algae sample, and after the citric acid solution of 0.2 mol/L was handled, the removal effect of Pb was better, and the Pd clearance is 94.5%.
With to compare difference little after the acid treatment, Cu combined attitude before Cu content in the fragrant plant mentioned in ancient texts algae was handled, and was present in the tissue with the form of chlorophyll verdigris, was difficult to removal.Can know also that from this table Cu content meets the vegetables standard during pollutant is limited the quantity of in GB2762 ~ 2005 food.
Embodiment 2
1. get Zhanjiang and transfer, fully wash, remove and be entrained in impurity such as the silt in the fragrant plant mentioned in ancient texts, broken shell, insect with the thread clear water along the thin fragrant plant mentioned in ancient texts in island, the clean back of rinsing draining, subsequent use;
2. get the above fragrant plant mentioned in ancient texts 1000g that handles well, add 6 liters of immersions of acetic acid solution of 18%, guarantee that fragrant plant mentioned in ancient texts is dipped under the liquid, acetic acid solution solution-treated temperature is 30 ℃ (room temperatures), water-bath vibration 24 hours;
3. this experiment heavy metal ion is measured and is adopted GBl7378.6 ~ 1998 " marine monitoring standard " to measure with GFAAS, measures result such as following table:
Cd concentration reaches 0.2869 mg/kg before handling in the fragrant plant mentioned in ancient texts algae sample, is 0.0573 mg/kg through the Cd concentration after 18% the acetic acid treatment in this test specimen, and the Cd clearance is 85.0%, and removal effect is better.
Pb concentration reaches 4.9230 mg/kg before handling in the fragrant plant mentioned in ancient texts algae sample, and 18% acetate is 93.4% to the clearance of Pb in the fragrant plant mentioned in ancient texts algae, and removal effect is very obvious.
It is, similar before Cu content in the fragrant plant mentioned in ancient texts algae is handled with the situation that citric acid is removed with to compare difference little after the acid treatment.
Fragrant plant mentioned in ancient texts frond cadmium before handling and lead all do not meet the vegetables standard during pollutant is limited the quantity of in GB2762 ~ 2005 food, meet the vegetables standard during pollutant is limited the quantity of in GB2762 ~ 2005 food after the processing.
Claims (5)
1. method of removing heavy metal lead and the cadmium of fragrant plant mentioned in ancient texts marine alga is characterized in that may further comprise the steps:
(1) preliminary treatment of raw material: select the few fragrant plant mentioned in ancient texts of impurity, fully wash, remove and be entrained in the impurity in the fragrant plant mentioned in ancient texts with clear water, the clean back of rinsing draining, for use;
(2) rinsing is clean fragrant plant mentioned in ancient texts frond is put into organic acid soln; Consumption was advisable to soak frond, and the part by weight of frond and acid solution is 1:5 ~ 8, and frond heavily is a weight in wet base; Immersion guarantees that fragrant plant mentioned in ancient texts is dipped under the liquid; 20 ℃ ~ 80 ℃, heavy metal lead and the cadmium that can remove the fragrant plant mentioned in ancient texts marine alga to neutrality are pulled, are drained or wash in water-bath vibration 12 ~ 24 hours out.
2. according to the described a kind of method of removing heavy metal lead and the cadmium of fragrant plant mentioned in ancient texts marine alga of claim 1, it is characterized in that: described raw material is dried product or the fresh fragrant plant mentioned in ancient texts of fragrant plant mentioned in ancient texts.
3. according to the described a kind of method of removing heavy metal lead and the cadmium of fragrant plant mentioned in ancient texts marine alga of claim 1, it is characterized in that: described organic acid is citric acid or acetic acid.
4. according to the described a kind of method of removing heavy metal lead and the cadmium of fragrant plant mentioned in ancient texts marine alga of claim 3; It is characterized in that: described citric acid solution molar concentration is 0.1 mol/L ~ 0.8mol/L; Mass percent concentration is 1.9% ~ 6.0%, and treatment temperature is 20 ℃ ~ 80 ℃, water-bath vibration 12 ~ 24 hours.
5. according to the described a kind of method of removing heavy metal lead and the cadmium of fragrant plant mentioned in ancient texts marine alga of claim 3; It is characterized in that: described acetum molar concentration is 0.5 mol/L ~ 5mol/L; Mass percent concentration is 3% ~ 18.0%, and treatment temperature is 20 ℃ ~ 80 ℃, water-bath vibration 12 ~ 24 hours.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949471A (en) * | 2014-05-12 | 2014-07-30 | 湖南农业大学 | Method for removing heavy metals Pb and Cd in oil crop meals by using organic acid salt |
| CN103949470A (en) * | 2014-05-05 | 2014-07-30 | 湖南农业大学 | Method for removing heavy metals (Pb, Zn, Cu, Cd and As) in plants by using different acids |
| CN105712794A (en) * | 2016-04-28 | 2016-06-29 | 天津芦阳化肥股份有限公司 | Special organic-inorganic blue-green alga compound fertilizer for soybeans and preparation method thereof |
| CN105712793A (en) * | 2016-04-28 | 2016-06-29 | 天津芦阳化肥股份有限公司 | Special organic-inorganic blue-green alga compound fertilizer for corn and preparation method thereof |
| CN105948898A (en) * | 2016-04-28 | 2016-09-21 | 天津芦阳化肥股份有限公司 | Blue-green algae organic-inorganic wheat special-purposed composite fertilizer and preparation method thereof |
| CN106360263A (en) * | 2016-11-08 | 2017-02-01 | 中国农业大学 | Method for eluting heavy metal cadmium in shii-take |
| CN108703302A (en) * | 2018-05-09 | 2018-10-26 | 无锡群硕谷唐生物科技有限公司 | A kind of processing method removing chromium and arsenic in kelp |
| CN110022692A (en) * | 2016-08-29 | 2019-07-16 | 赛克洛普公司 | Pollutant is removed from organic matter |
| CN110558474A (en) * | 2019-09-19 | 2019-12-13 | 广东海洋大学 | Simple method for removing cadmium from scallop processing waste |
| CN113749227A (en) * | 2021-07-26 | 2021-12-07 | 大连盖世健康食品股份有限公司 | Novel method for solving standard exceeding of heavy metal lead in seaweed product |
| CN114681495A (en) * | 2020-12-29 | 2022-07-01 | 四川新绿色药业科技发展有限公司 | Preparation method of seaweed extract capable of efficiently removing heavy metals, seaweed extract prepared by preparation method and preparation |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949470A (en) * | 2014-05-05 | 2014-07-30 | 湖南农业大学 | Method for removing heavy metals (Pb, Zn, Cu, Cd and As) in plants by using different acids |
| CN103949471A (en) * | 2014-05-12 | 2014-07-30 | 湖南农业大学 | Method for removing heavy metals Pb and Cd in oil crop meals by using organic acid salt |
| CN105712794A (en) * | 2016-04-28 | 2016-06-29 | 天津芦阳化肥股份有限公司 | Special organic-inorganic blue-green alga compound fertilizer for soybeans and preparation method thereof |
| CN105712793A (en) * | 2016-04-28 | 2016-06-29 | 天津芦阳化肥股份有限公司 | Special organic-inorganic blue-green alga compound fertilizer for corn and preparation method thereof |
| CN105948898A (en) * | 2016-04-28 | 2016-09-21 | 天津芦阳化肥股份有限公司 | Blue-green algae organic-inorganic wheat special-purposed composite fertilizer and preparation method thereof |
| CN110022692A (en) * | 2016-08-29 | 2019-07-16 | 赛克洛普公司 | Pollutant is removed from organic matter |
| CN106360263A (en) * | 2016-11-08 | 2017-02-01 | 中国农业大学 | Method for eluting heavy metal cadmium in shii-take |
| CN108703302A (en) * | 2018-05-09 | 2018-10-26 | 无锡群硕谷唐生物科技有限公司 | A kind of processing method removing chromium and arsenic in kelp |
| CN108703302B (en) * | 2018-05-09 | 2021-04-16 | 无锡新禾创工食品科技有限公司 | Processing method for removing chromium and arsenic in kelp |
| CN110558474A (en) * | 2019-09-19 | 2019-12-13 | 广东海洋大学 | Simple method for removing cadmium from scallop processing waste |
| CN114681495A (en) * | 2020-12-29 | 2022-07-01 | 四川新绿色药业科技发展有限公司 | Preparation method of seaweed extract capable of efficiently removing heavy metals, seaweed extract prepared by preparation method and preparation |
| CN113749227A (en) * | 2021-07-26 | 2021-12-07 | 大连盖世健康食品股份有限公司 | Novel method for solving standard exceeding of heavy metal lead in seaweed product |
| CN113749227B (en) * | 2021-07-26 | 2023-10-13 | 大连盖世健康食品股份有限公司 | Method for solving problem of exceeding of heavy metal lead in seaweed product |
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