CN112198032A - Standard sample for heavy metal in packaging paper and preparation method thereof - Google Patents
Standard sample for heavy metal in packaging paper and preparation method thereof Download PDFInfo
- Publication number
- CN112198032A CN112198032A CN202011202748.1A CN202011202748A CN112198032A CN 112198032 A CN112198032 A CN 112198032A CN 202011202748 A CN202011202748 A CN 202011202748A CN 112198032 A CN112198032 A CN 112198032A
- Authority
- CN
- China
- Prior art keywords
- packaging paper
- heavy metal
- standard sample
- powder
- preparing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Wrappers (AREA)
Abstract
The invention is applicable to the technical field of standard substance preparation, and discloses a heavy metal standard sample in packaging paper and a preparation method thereof, wherein the preparation method comprises the following steps: 1. polishing the surface of the blank packaging paper to make the surface rough; 2. preparing a heavy metal mixed solution; 3. preparing a bearing matrix of a target element; 4. preparing a protective film base material; 5. uniformly coating the bearing matrix containing the target elements on two surfaces of blank packing paper, and drying; 6. coating the protective film base material on two surfaces coated with the bearing substrate, drying and cutting to obtain the heavy metal standard sample in the packaging paper. The standard sample of the heavy metal in the packaging paper prepared by the invention can be used for comparison of heavy metal detection data in the packaging paper in a laboratory, verification of accuracy of a detection method, calibration of a detection instrument, quality control and assessment of a test result and the like.
Description
Technical Field
The invention belongs to the technical field of standard samples, and particularly relates to a standard sample of heavy metal in packaging paper and a preparation method thereof.
Background
The paper invention has epoch-making significance in human development history, greatly promotes the progress of human civilization, and the paper media still plays an important role in the current times of media prosperity. Paper is of no use, and particularly, printing, packaging and other industries are very important. With the development of society and the improvement of environmental protection consciousness of people, paper products are more and more paid more attention to modern society by the green and environmental protection materials.
During the production of paper, various chemicals such as bleaches, processing aids, printing inks, anti-corrosion and anti-microbial agents, etc. need to be added to improve the performance and aesthetic properties of various paper products. However, it has been found that these chemicals remain in the paper and migrate to the contact material, and some of the migrates have toxic or even carcinogenic effects, which may pose a health hazard to consumers, and this has led to concern and research on the safety of paper materials.
Currently, governments and consumers around the world increasingly attach importance to the hygienic safety of paper contact materials (including food containers, utensils) and packaging materials, and also set increasingly strict standards for hygiene limits. Developed countries such as the united states, the european union, and japan have established standards for regulations and limits on packaging materials that come into contact with food, and have implemented strict market admission control. After WTO is added in China, the international market share of exported food packaging and contact materials tends to rise year by year, and meanwhile, the situations of forbidden entry, return and destruction and the like are increased continuously because safety and sanitary items do not meet the regulatory standards of developed countries and regions such as the United states, European Union, Japan and the like, so that huge economic losses are caused to enterprises. In recent years, the european union has announced to our country the safety and hygiene issues of nearly hundreds of food packaging and contact materials. After the countries such as Japan and America, etc. examine that the food packaging material exported by China finds the unqualified condition, the measures of withholding are adopted.
The problem that the content of heavy metals in paper exceeds the standard is always taken into consideration, particularly, lead, chromium, cadmium and arsenic have greater harm to human beings, and the heavy metals cannot be decomposed in the human body and are difficult to be discharged out of the body to cause enrichment, so that the health of the human body is finally harmed. Lead is the first harmful heavy metal recognized by human beings, is an element with greater harmfulness, exists in large quantity in the environment, is easily enriched by plants, and is transferred into the body from the food chain. Lead is accumulated in the body for a long period of time, and is not easily discharged out of the body by metabolism, and thus, is likely to cause damage to the human body. The influence on the brain and the nervous system can be caused under the influence of low lead concentration for a long time. Acute lead poisoning of human body can cause symptoms of headache, shivering, digestive system diseases, nervous dysphoria and the like, and even death.
As a preservative, arsenic mainly destroys the redox ability of cells and influences the normal metabolism of the cells. Cadmium causes osteoporosis and softening of bones in the human body, causes spasm of the human body, seriously causes natural fracture, and has carcinogenic and teratogenic effects. The hexavalent chromium is the most toxic of chromium and the compounds thereof, and eating excessive hexavalent chromium compounds can cause thickening of oral mucosa, regurgitation and vomiting, severe abdominal pain and hepatomegaly, and is accompanied with symptoms such as headache, dysphoria, tachypnea, purplish nails of lips and lips, muscle spasm and the like, and can cause circulatory failure, unconsciousness and even death in severe cases. Lead is used as a stabilizer, and lead and its compounds can cause damage to various systems such as nerves, hematopoiesis, digestion, kidney, cardiovascular and endocrine after entering the body, and lead poisoning can be caused if the content of lead is too high.
With the development of the fast food industry and the cooked food industry, the amount of wrapping paper in direct contact with food is increasing for consumers to eat and carry conveniently. For example, in european restaurants, foods such as hamburgers, egg tarts, and snacks are directly packaged with paper or paper boxes, and paper cans coated with plastic films are widely used for packaging various beverages such as milk, fruit juice, and milk tea. Meanwhile, paper packaging containers with multiple functions of oil resistance, fresh preservation, sterilization, corrosion prevention and the like emerge endlessly in the packaging markets of countries all over the world. Based on the wide application of paper products, paper is a recyclable material, and in order to enhance heavy metal detection of the paper products, improve detection level and accuracy, particularly trace detection, reduce harm of heavy metals to people and practically improve the healthy living standard of people, the paper has great demand on heavy metal standard samples in packaging paper.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a standard sample of heavy metal in packaging paper and a preparation method thereof. The method comprises the steps of firstly preparing a bearing matrix containing heavy metal elements and a protective film base material, uniformly coating (drying) the base material on two surfaces of blank packaging paper with polished surfaces, cutting the blank packaging paper into small blocks of 5 x 5mm, and preparing the heavy metal standard sample in packaging paper after uniformity and stability tests and joint assignment. The standard sample can be used for comparison of heavy metal detection data in packaging paper in a laboratory, accuracy verification of a detection method, calibration of a detection instrument, quality control and assessment of a test result and the like.
The technical scheme of the invention is as follows: a preparation method of a standard sample of heavy metal in packaging paper is characterized by comprising the following steps:
(1) polishing the surface of the blank packaging paper to make the surface rough;
(2) preparing a mixed stock solution containing lead, cadmium, chromium and arsenic;
(3) uniformly mixing the cassava powder, the agaric powder, the peach gum powder, the agar powder, the carbomer and the alginic acid, slowly adding the mixture into a mixed reserve aqueous solution under a stirring state, and preparing a bearing matrix containing a target element;
(4) uniformly mixing pure water, waterborne polyurethane resin and carbomer to obtain a protective film base material;
(5) uniformly coating the bearing substrate containing the target element prepared in the step (3) on the first surface (front surface) of the blank packaging paper polished in the step (1) by adopting a coating process, drying, and coating and drying the second surface (back surface);
(6) and (5) coating the base material of the protective film prepared in the step (4) on two sides of the packaging paper treated in the step (5), and drying. Cutting the sample into small blocks of 5 x 5mm by using a cutting machine, and preparing the heavy metal standard sample in the packaging paper after uniformity and stability tests and joint assignment.
In the mixed stock solution in the step (2), the concentration range of each element is 1-50000 mg/L.
The mass ratio of the cassava flour, the nostoc commune powder, the peach gum powder, the agar powder, the carbomer and the alginic acid in the step (3) is (cassava flour) 0.5-1: (Auricularia auricula powder) 0.8-1.2: (peach gum powder) 0.8-1.2: (agar powder) 1.2-1.8: (carbomer) 0.03-0.08: 0.3-0.8 of (alginic acid), wherein the optimal mass ratio is 1: 1: 1: 1.5: 0.05: 0.5. the mass of the dry base material and the water is 4: 1-6: 1, the optimal proportion is 5: 1.
in the adding process of the step (3), the stirring speed is increased by 120r/min along with the increase of the system viscosity, circulating cooling water is introduced into a jacket of a stirrer to reduce the temperature, and the stirring speed is maintained to continue stirring for 15 min.
The mass ratio of the water to the waterborne polyurethane resin in the step (4) is 1: 1-1: 3, the optimal mass ratio is 1: 2; the mass ratio of water to carbomer is 1: 0.03 to 1: 0.08, and the optimal mass ratio is 1: 0.05.
compared with the prior art, the invention has the following remarkable advantages:
1. the prior art is that the paper product is prepared by directly adding a target compound after crushing a paper shell and then soaking and mixing the crushed paper shell, and because the paper product mainly contains wood fibers, the paper product is not easy to be prepared into powder with uniform particle size, and most of the paper product is flocculent fibers, the aim of uniformly and stably obtaining target substances is not easy to achieve. The invention adopts a coating process to uniformly coat the target substance on the surface of the substrate, thereby overcoming the problem of difficult grinding.
2. The surface of the blank packaging paper is polished, so that target elements can permeate into the packaging paper, the adhesive force of the bearing matrix on the surface of the packaging paper is improved, and the effect of preventing the coating layer from falling off is achieved.
3. The invention adopts cassava powder, nostoc commune powder, peach gum powder, agar powder, carbomer and alginic acid as the bearing matrix of target elements, the materials are all compatible with water, a gel substance with slight fluidity is formed after the materials are mixed with proper amount of water, water-soluble target compounds can be uniformly dispersed in the bearing matrix, and the target compounds are kept not to be layered or segregated, and meanwhile, the gel mixture with slight fluidity also meets the requirements of a coating process on coating slurry.
4. The matrix effect of the cassava powder, the agaric powder, the peach gum powder, the agar powder and the alginic acid which are used as the target element bearing matrix is similar to that of the wood fiber. Carbomer is acrylic acid cross-linked resin, the base material of the protective film is water-based polyurethane resin, and the two substances are components of ink and adhesive used in the production process of packaging paper, so that the matching of the standard sample and the base material of an actual tested sample is ensured to the greatest extent by the heavy metal standard sample in the packaging paper provided by the invention.
5. The water-based polyurethane protective film is coated on the target element bearing substrate coating, the protective effect is provided for the heavy metal standard sample target element bearing substrate coating in the packaging paper while the procedure of printing ink on the surface of the packaging paper is simulated, the target element bearing substrate can be effectively prevented from falling off due to friction of a standard product in the processes of cutting, transporting and using, and the change of the content of the target element due to the fact that the standard sample absorbs moisture and is damped is prevented to a certain extent.
6. The heavy metal standard sample in the packaging paper provided by the invention is a small block with the size of 5 x 5mm, and compared with the existing powdery standard sample, the heavy metal standard sample has the advantages of good stability, difficulty in moisture absorption and wetting, convenience in weighing and the like. The sample matrix is paper, and compared with other materials, the sample matrix is a relatively good digestion material, and the measurement result can be directly influenced if the prepared sample can be completely digested. The chemical components of the materials used in the preparation process are consistent with those of actual commodities, and the matching of the base materials of the standard sample and the actual tested sample is ensured to the greatest extent. The data obtained when the standard heavy metal sample in the packaging paper is inspected by the Grubbs inspection method, the Dixon inspection method and the F inspection method are reliable and effective, the detection requirement of the standard sample is met, and the method can be used for measurement and calibration of related instruments, inspection and method verification during instrument periods, assessment of measuring personnel and the like, and provides a basis for subsequent preparation control.
Detailed Description
The invention is further illustrated with reference to the following examples, without limiting the scope of the invention thereto. The waterborne polyurethane resin used in the invention is a Dow chemical YH-3000 type product.
Example 1:
this example was conducted to prepare a total weight of 10000g, lead content: 34mg/kg, cadmium content: 20mg/kg, chromium content: 40mg/kg, arsenic content: 35mg/kg of wrapping paper is taken as an example.
The production method comprises the following steps:
(1) polishing two surfaces of the blank packaging paper to make the surfaces rough;
(2) accurately weighing 0.5436g of lead nitrate, 0.4207g of cadmium nitrate, 1.8307g of chromium nitrate and 0.6069g of sodium arsenite according to the mass, dissolving in 5L of deionized water, and uniformly mixing to prepare a mixed stock solution containing lead, cadmium, chromium and arsenic elements;
(3) transferring the mixed stock solution into a stirrer, and uniformly mixing 200g of accurately weighed cassava powder, 200g of nostoc commune powder, 200g of peach gum powder, 300g of agar powder, 10g of carbomer and 100g of alginic acid; slowly adding the mixture into a mixed stock solution containing lead, cadmium, chromium and arsenic while stirring, wherein the stirring speed is increased along with the increase of the system viscosity in the adding process, then keeping the rotating speed of 120r/min, introducing circulating cooling water into a stirrer jacket, and stirring for 15min to prepare a bearing matrix containing the target element;
(4) cleaning the mixture in a stirrer, adding 2L of pure water and 4000g (solid content: 45%) of waterborne polyurethane resin into the stirrer, mixing at a rotating speed of 60r/min for 10min, slowly adding 100g of carbomer while stirring, and mixing at a rotating speed of 60r/min for 20min to obtain a base material of the protective film;
(5) uniformly coating the bearing substrate containing the target element prepared in the step (3) on the first surface of the blank packaging paper polished in the step (1) by adopting a coating process, horizontally standing for 10min, transferring into a forced air oven, drying at 80 ℃ for 15min, taking out, and coating and drying the second surface according to the steps;
(6) and (3) respectively coating the protective film base material prepared in the step (4) on two sides of the packaging paper treated in the step (5) by adopting the process in the step (5), drying, and cutting into small blocks of 5 x 5mm by using a cutting machine to obtain the heavy metal standard sample in the packaging paper.
First, uniformity test
The uniformity test was carried out for the example of lead (Pb) in the standard sample of the packaging paper obtained by the above method.
The test method comprises the following steps: randomly 15 samples (total number of samples less than 500 bottles) were taken from the total sample population, each sample was tested 2 times under repeated conditions, and repeated tests should be individually sampled. The content of lead (Pb) in the packaging paper was determined by inductively coupled plasma emission spectrometry (ICP-OES), and all repetitive tests of the samples were performed in a random order in order to reduce the influence of directional variations in the measurements.
The data statistical analysis method comprises the following steps: carrying out data statistics processing by adopting a single-factor variance analysis method, and carrying out sample uniformity evaluation, wherein a related calculation formula is as follows:
total number of measurements:
total test mean value:
the sum of the difference between groups:
within-group variance and sum:
degree of freedom between groups: gamma ray1＝m-1
In-group degree of freedom: gamma ray2＝N-m
Statistic F:
according to degree of freedom (gamma)1，γ2) And given significance level α (taking α ═ 0.05), the clinical significance was found from the F distribution tableF of worldαComparing the value with the F value calculated by the formula, if the calculated F value is less than FαValues, indicating no significant differences between samples within a sample. The results of the uniformity test and the anova analysis of the lead (Pb) content in the packaging paper manufactured according to the above examples are shown in table 1.
Table 1 lead (Pb) uniformity validation and uncertainty introduced by it
From the above test results, the statistical calculation of the lead (Pb) content in the packaging paper of this lot resulted in a test threshold value of F < F0.05(14,15), indicating that the standard sample had no significant difference between bottles and within bottles, and that the samples of the packaging paper material containing lead (Pb) of this lot had good uniformity.
Secondly, testing the stability of the sample:
the test method comprises the following steps: the stability of the samples was monitored at month, 2 months, 3 months, 5 months, 8 months, 13 months, 15 months, 19 months after the completion of the aliquoting of the samples. Randomly extracting 5 bottles of samples from the stock samples at each time point for testing, and taking the total average value of the extracted samples as the stability test result of the characteristic quantity value at the time point, wherein the stability test adopts inductively coupled plasma emission spectrometry (ICP-OES) to determine the lead (Pb) content in the packaging paper.
The stability assessment basis model can be expressed as the formula:
Y＝β0+β1X
in the formula:
β1、β0-regression coefficients;
x- - -time;
y- -characteristic value of the standard sample candidate.
For stable standard samples, beta1Is zero. X and YWhether a linear relation exists between the two can be checked by a t-test method. the relevant test formula of the t test method is as follows:
assuming that there are n observations of X, Y (X)i，Yi) Y on each analog straight lineiCan be expressed by the formula:
Yi＝β0+β1Xi
slope:
estimate of intercept: beta is a0＝Y-β1X
Beta can be calculated by error analysis0And beta1Standard deviation of
β1Standard deviation of (d):
standard deviation per point on the straight line:
based on beta1The standard deviation of (a), can be judged by the following t-test: the batch of standard samples was monitored 8 times in total, i.e. t (0.95,6) ═ 2.45 was found in the table where n ═ 8 was found. The slope significance test is shown in table 2 below.
TABLE 2 stability test of lead (Pb) in packaging paper
From the above examination, | β can be found1|<t(0.95,n-2)·S(β1) Then the slope is not significant and no instability is observed. The sample has no significant difference in 19 months experiment period and has good stability.
The standard sample is used by multiple users such as the Jinan customs, and is proved to be: the standard sample has good uniformity and stability, and when the heavy metal in the packaging paper is actually analyzed and tested, the standard sample has high matching degree with the sample base material, and the detection result has good accuracy and reliability, so that the method is suitable for quality evaluation, laboratory approval, capability verification and the like of the detection work of the heavy metal in the packaging paper among laboratories.
The standard sample for analyzing and testing heavy metals in the paper for packaging provided by the invention has the advantages of strong designability of components, high uniformity of the standard sample and good stability.
The uniformity and 19-month stability experiments of the samples show that the standard sample of the heavy metal in the packaging paper prepared by the formula and the preparation method has good uniformity and stability. Has innovativeness, basic property and good market application prospect.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A preparation method of a standard sample of heavy metal in packaging paper is characterized by comprising the following steps:
(1) polishing the surface of the blank packaging paper to make the surface rough;
(2) preparing a mixed stock solution containing lead, cadmium, chromium and arsenic;
(3) uniformly mixing the cassava powder, the agaric powder, the peach gum powder, the agar powder, the carbomer and the alginic acid, slowly adding the mixture into a mixed reserve aqueous solution under a stirring state, and preparing a bearing matrix containing a target element;
(4) uniformly mixing pure water, waterborne polyurethane resin and carbomer to obtain a protective film base material;
(5) uniformly coating the bearing substrate containing the target element prepared in the step (3) on the first surface of the blank packaging paper polished in the step (1) by adopting a coating process, drying, and coating and drying the second surface;
(6) and (5) coating the base material of the protective film prepared in the step (4) on two sides of the packaging paper treated in the step (5), and drying.
2. The method for preparing a standard sample of heavy metals in packaging paper as claimed in claim 1, wherein the packaging paper prepared in step (6) is cut into small pieces of 5 x 5mm by a cutting machine.
3. The method for preparing the standard sample of the heavy metal in the packaging paper as claimed in claim 1, wherein the concentration range of each element in the mixed stock solution in the step (2) is 1-50000 mg/L.
4. The preparation method of the standard sample of the heavy metal in the packaging paper, as claimed in claim 1, wherein the mass ratio of the cassava powder, the nostoc commune powder, the peach gum powder, the agar powder, the carbomer and the alginic acid in the step (3) is 0.5-1: 0.8-1.2: 0.8-1.2: 1.2-1.8: 0.03 to 0.08: 0.3 to 0.8.
5. The method for preparing the standard sample of the heavy metal in the packaging paper as claimed in claim 4, wherein the mass ratio of the cassava powder, the nostoc commune powder, the peach gum powder, the agar powder, the carbomer and the alginic acid in the step (3) is 1: 1: 1: 1.5: 0.05: 0.5.
6. the method for preparing the standard sample of the heavy metal in the packaging paper as claimed in claim 1, wherein the total mass of the cassava powder, the nostoc commune powder, the peach gum powder, the agar powder, the carbomer and the alginic acid in the step (3) and the mass of the water are 4: 1-6: 1.
7. the method for preparing the standard sample of the heavy metal in the packaging paper as claimed in claim 1, wherein in the step (4), the mass ratio of pure water to the aqueous polyurethane resin is 1: 1-1: 3; the mass ratio of the pure water to the carbomer is 1: 0.03 to 1: 0.08.
8. the method for preparing the standard sample of the heavy metal in the packaging paper as claimed in claim 7, wherein the mass ratio of the pure water to the aqueous polyurethane resin in the step (4) is 1: 2; the mass ratio of the pure water to the carbomer is 1: 0.05.
9. the method for preparing a standard sample of heavy metal in packaging paper as claimed in any one of claims 1 to 8,
in the adding process of the step (3), the stirring speed is increased to 120r/min along with the increase of the system viscosity, circulating cooling water is introduced into a jacket of a stirrer to reduce the temperature, and the stirring speed is maintained to continue stirring for 15 min;
the step (4) is uniformly mixed as follows: stirring and mixing pure water and the waterborne polyurethane resin, slowly adding carbomer under the stirring state, and uniformly mixing to obtain the base material of the protective film.
10. A heavy metal standard sample prepared by the preparation method according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011202748.1A CN112198032A (en) | 2020-11-02 | 2020-11-02 | Standard sample for heavy metal in packaging paper and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011202748.1A CN112198032A (en) | 2020-11-02 | 2020-11-02 | Standard sample for heavy metal in packaging paper and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112198032A true CN112198032A (en) | 2021-01-08 |
Family
ID=74012297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011202748.1A Pending CN112198032A (en) | 2020-11-02 | 2020-11-02 | Standard sample for heavy metal in packaging paper and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112198032A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454337A (en) * | 2013-08-01 | 2013-12-18 | 浙江中烟工业有限责任公司 | Method for quantifying content of arsenic and lead in quality control sample of tipping paper for cigarette |
| CN104101572A (en) * | 2013-04-11 | 2014-10-15 | 江苏中烟工业有限责任公司徐州卷烟厂 | Method for detecting content of heavy metals in inner liner for cigarette |
| CN105758682A (en) * | 2016-02-01 | 2016-07-13 | 许菲菲 | Preparation method of standard substance for detecting harmful heavy metal in ornaments |
| CN108120625A (en) * | 2017-09-30 | 2018-06-05 | 广东华科检测技术服务有限公司 | Total lead and total cadmium standard sample and preparation method thereof in textile |
| CN111323282A (en) * | 2020-04-10 | 2020-06-23 | 广州海关技术中心 | Preparation method of paint powder standard sample containing 17 migratable elements limited in toy field |
| CN111610174A (en) * | 2020-06-04 | 2020-09-01 | 云南省计量测试技术研究院 | Preparation method of heavy metal-containing tobacco matrix standard substance |
| NL2028902B1 (en) * | 2021-08-02 | 2021-12-14 | Qingdao Customs Tech Center | Standard sample of heavy metals in packaging paper and preparation method thereof |
-
2020
- 2020-11-02 CN CN202011202748.1A patent/CN112198032A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101572A (en) * | 2013-04-11 | 2014-10-15 | 江苏中烟工业有限责任公司徐州卷烟厂 | Method for detecting content of heavy metals in inner liner for cigarette |
| CN103454337A (en) * | 2013-08-01 | 2013-12-18 | 浙江中烟工业有限责任公司 | Method for quantifying content of arsenic and lead in quality control sample of tipping paper for cigarette |
| CN105758682A (en) * | 2016-02-01 | 2016-07-13 | 许菲菲 | Preparation method of standard substance for detecting harmful heavy metal in ornaments |
| CN108120625A (en) * | 2017-09-30 | 2018-06-05 | 广东华科检测技术服务有限公司 | Total lead and total cadmium standard sample and preparation method thereof in textile |
| CN111323282A (en) * | 2020-04-10 | 2020-06-23 | 广州海关技术中心 | Preparation method of paint powder standard sample containing 17 migratable elements limited in toy field |
| CN111610174A (en) * | 2020-06-04 | 2020-09-01 | 云南省计量测试技术研究院 | Preparation method of heavy metal-containing tobacco matrix standard substance |
| NL2028902B1 (en) * | 2021-08-02 | 2021-12-14 | Qingdao Customs Tech Center | Standard sample of heavy metals in packaging paper and preparation method thereof |
| NL2028902B9 (en) * | 2021-08-02 | 2022-02-07 | Qingdao Customs Tech Center | Standard sample of heavy metals in packaging paper and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Hall et al. | Determination of dietary starch in animal feeds and pet food by an enzymatic-colorimetric method: Collaborative study | |
| Nayik et al. | Physico-chemical, enzymatic, mineral and colour characterization of three different varieties of honeys from Kashmir valley of India with a multivariate approach | |
| Dorsey-Redding et al. | Relationships among maize quality factors | |
| Keskin-Šašić et al. | Total phenolic content and antioxidant capacity of fruit juices | |
| Zhu et al. | Relationship between instrumental and visual color in a raw, fresh beef and chicken model system | |
| Kayode et al. | Physico-chemical investigation of honey samples from bee farmers in Ekiti State, Southwest Nigeria | |
| Galiotou‐Panayotou et al. | Phytase–phytate–pectin hypothesis and quality of legumes cooked in calcium solutions | |
| Hmar et al. | Physico-chemical, mechanical and antioxidant properties of kendu (Diospyros melanoxylon Roxb.) | |
| Ali et al. | Antioxidant activity of fruits available in Aizawl market of Mizoram, India | |
| NL2028902B9 (en) | Standard sample of heavy metals in packaging paper and preparation method thereof | |
| Senhofa et al. | The effect of packaging type on quality of cereal muesli during storage. | |
| CN112198032A (en) | Standard sample for heavy metal in packaging paper and preparation method thereof | |
| Akbar et al. | Aflatoxin occurrence in nuts consumed in Arak, Iran | |
| Kolapo et al. | Aflatoxin, nutritive values and microbiological status of stored cakes of some selected Nigerian oil seeds | |
| Perišić et al. | Impact of diatomaceous earth application on the rheological properties of wheat, triticale and rye flour dough | |
| Asema et al. | Study of heavy metal content by AAS in a variety of flavours of jam samples and its physicochemical characterization | |
| Shoaei et al. | The risk assessment of sulphite intake through dried fruit consumption in Hamadan, Iran | |
| Allah et al. | Assessment of toxic and essential heavy metals in imported dried fruits sold in the local markets of Jordan | |
| Ishiwata et al. | Evaluation of the Contents of Antifungal Agents Allowed as Food Additives in Foods and the Daily Intake Deduced from the Results of the Official Inspection in Japan in Fiscal Year 1994 Concentration of Food Additives in Foods and the Daily Intake in Japan (Report No. 2) | |
| Ukom et al. | Physicochemical properties and antioxidant activities of honey from southern Nigeria | |
| Nassehinia et al. | Comparing efficiency of rice washing and soaking processes in reducing the amount of aflatoxin B1. | |
| Gudi et al. | Quantitative evaluation of hydrogen cyanide content, chemical and functional properties of gari from Akwanga, Nasarawa state, Nigeria | |
| Hewawasam | Variation of Histamine Development in Different Body LMcations of YeHowfin Tuna (Thunnus albacares) Stored at 0 C | |
| Okoye et al. | Nitrite, nitrate and nitrosamine concentrations in common wine brands, malt drinks and fruit juices in Makurdi, Benue State | |
| Masitah et al. | Analyze of formalin in kolang kaling (Arenga pinnata Merr) and black grass jelly (Mesona palustris BL) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210108 |
|
| WD01 | Invention patent application deemed withdrawn after publication |