CN113777202A - Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products - Google Patents
Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products Download PDFInfo
- Publication number
- CN113777202A CN113777202A CN202111095144.6A CN202111095144A CN113777202A CN 113777202 A CN113777202 A CN 113777202A CN 202111095144 A CN202111095144 A CN 202111095144A CN 113777202 A CN113777202 A CN 113777202A
- Authority
- CN
- China
- Prior art keywords
- nitrogen
- sulfur
- sample
- content
- standard
- 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
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/66—Thermal conductivity detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for simultaneously and rapidly measuring the nitrogen and sulfur content in aquatic products, belonging to the technical field of aquatic product detection, and the method comprises the following steps: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) a testing step, 4) instrument conditions used in an experiment, and 5) calculation and expression of results; the method of the invention utilizes aquatic products to be burnt and decomposed into gas at 900 ℃ in oxygen-enriched atmosphere, the gas enters a reduction copper part at the lower part of a combustion tube under the driving of high-purity helium as carrier gas, sulfur trioxide is converted into sulfur dioxide, nitrogen oxide is converted into nitrogen, water and carbon dioxide in the mixed gas are respectively absorbed through 2 purification columns, the adsorption columns adsorb the sulfur dioxide, and the rest nitrogen directly enters a thermal conductivity detector to detect the content of the nitrogen. Heating the sulfur dioxide adsorption column, and loading the analyzed sulfur dioxide into a thermal conductivity detector by helium to detect the content of the sulfur dioxide; the method meets the detection requirements that nitrogen and sulfur in the aquatic products are not needed to be digested, a solid sample can be directly injected and simultaneously measured, and the timeliness is strong.
Description
Technical Field
The invention belongs to the technical field of aquatic product detection, and particularly relates to a method for simultaneously and rapidly determining the nitrogen and sulfur content in an aquatic product.
Background
Aquatic products are important sources for acquiring high-quality proteins by human beings, and the detection method corresponding to the content of the proteins in the current food is the national standard GB 5009.5-2016 determination of the proteins in food in national standard for food safety, and the method needs to add concentrated sulfuric acid for high-temperature decomposition at 420 ℃ under the condition of catalytic heating, and the generated ammonia is combined with the sulfuric acid to generate ammonium sulfate; alkalifying and distilling to free ammonia, absorbing with boric acid, titrating with sulfuric acid or hydrochloric acid standard titration solution, calculating nitrogen content according to acid consumption, and multiplying by conversion coefficient to obtain protein content. The method is far away from the requirement of real-time monitoring of product quality; in addition: the detection principle in national food safety standard GB 5009.34-2016 is to acidify and distill the sample in a closed container, the distillate is absorbed by lead acetate solution, the absorbed solution is acidified by hydrochloric acid, the iodine standard solution is titrated, and the sulfur dioxide content in the sample is calculated according to the consumed iodine standard solution (the standard is only used for drying food). At present, two existing detection methods are complex in detection steps, multiple in factors influencing data accuracy and long in time consumption.
Disclosure of Invention
The technical scheme to be solved by the invention is to provide a method for simultaneously and rapidly measuring the nitrogen and sulfur content in aquatic products. The method utilizes aquatic products to generate nitrogen oxide gases such as carbon dioxide, water, nitric oxide and the like and gases such as sulfur dioxide, sulfur trioxide and the like by combustion decomposition at 900 ℃ in an oxygen-rich atmosphere, under the drive of high-purity helium as carrier gas, the high-purity helium enters the reduction copper at the lower part of the combustion tube, redundant oxygen is absorbed, sulfur trioxide is converted into sulfur dioxide, nitric oxide is converted into nitrogen, then magnesium perchlorate and phosphorus pentoxide are adopted to absorb water in the mixed gas, alkali asbestos is adopted to absorb carbon dioxide in the mixed gas, the rest gas is nitrogen and sulfur dioxide, a carbon molecular sieve is adopted to absorb the sulfur dioxide in the rest gas, the rest nitrogen directly enters a thermal conductivity detector to detect the content of the nitrogen, after the nitrogen detection is finished, heating the sulfur dioxide adsorption column, resolving sulfur dioxide from the adsorbent, and loading helium into a thermal conductivity detector to detect the content of the sulfur dioxide; the method meets the detection requirements that nitrogen and sulfur in the aquatic products are not needed to be digested, a solid sample can be directly injected and simultaneously measured, and the timeliness is strong.
The invention is completed according to the following operation method:
a method for simultaneously and rapidly measuring the nitrogen and sulfur content in aquatic products comprises the following steps: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) a testing step, 4) instrument conditions used in an experiment, and 5) calculation and expression of results;
1) instruments and equipment:
(1) the direct sample introduction nitrogen and sulfur tester comprises a solid sample introduction system, a two-stage purging device, 2 purifying and filling columns, 1 adsorption column, a nickel-chromium wire resistance furnace, a quartz tube, 2 gas path control systems and a tin foil cup; the solid sample introduction system is sequentially connected with 2 purifying filling columns and 1 adsorption column, the quartz tube is positioned in the nickel-chromium wire resistance furnace, and 2 gas path control systems respectively control high-purity helium and oxygen;
(2) the thermal conductivity cell detector comprises a Mass Flow Controller (MFC), a gas circuit control system, a reference gas flow controller and a detector;
(3) high purity helium and oxygen;
2) preparation of a standard curve: respectively weighing a sample of standard substance laver, placing in a tinfoil cup, placing in a nickel-chromium wire resistance furnace, performing pyrolysis, sequentially passing through 2 purifying and filling columns to respectively adsorb H2O and CO2The nitrogen oxides are reduced into N by copper in a nickel-chromium wire resistance furnace2，N2Loading high-purity helium gas into a thermal conductivity detector for measurement; heating the adsorption column, SO2Analyzing from the adsorption column agent, loading helium into a thermal conductivity detector to detect the content of the helium, and drawing a standard curve by using the nitrogen-sulfur concentration and the fluorescence area of a thermal conductivity cell;
3) the testing steps are as follows:
uniformly mixing the crushed (or homogenized fresh) samples, putting the mixture into a tin foil cup, and measuring the nitrogen and sulfur value by using the instrument and equipment in the step 1), wherein the detection method is the same as the preparation of the standard curve in the step 2);
4) conditions of the apparatus used for the experiment:
(1) conditions of the solid sample injection system: the purging time is 20 s; the pyrolysis temperature is 900 ℃, and the time is 100 s; the first purifying packed column filler is magnesium perchlorate and phosphorus pentoxide for adsorbing H2O; the second purifying packed column has alkali asbestos and phosphorus pentoxide as stuffing for adsorbing CO2(ii) a The adsorption column is filled with carbon molecular sieve for adsorbing SO2；
(2) Thermal conductivity cell detector conditions: the thermistor is 8K omega, the amplification circuit is 7 times, the carrier gas flow rate is 250mL/min, the reference gas flow rate is 50mL/min, and the reading time is 6(s);
5) and calculating and expressing the result:
drawing a standard working curve by using an external standard method in data processing software, storing the standard working curve, analyzing and processing the peak area of a sample, correcting by using an external standard to obtain the concentration of nitrogen and sulfur in the sample to be detected, and calculating according to the following formulas (1) and (2) to obtain the content of the substance to be detected in the sample:
X1＝C/m/100..............(1)
in the formula:
X1-the content of test substance N in the sample, g/100 g;
c, the concentration of N in the sample to be detected, mg;
m represents the sample weight and mg;
X2＝C/m/100..............(2)
in the formula:
X2-the content of the test substance S in the sample, g/100 g;
c, the concentration of S in the sample to be detected, mg;
m represents the sample amount, mg.
Compared with the prior art, the invention has the beneficial effects that:
1. the experimental conditions are reasonably selected, the detection data is accurate and reliable, the nitrogen and sulfur in the aquatic products can be directly subjected to solid sample injection and simultaneously measured without digestion, and the pollution caused by digestion with strong acid is avoided;
2. the method has the characteristics of high detection speed of the nitrogen and sulfur content in the aquatic product and strong timeliness of quality supervision. Meanwhile, the defects of detection data distortion and long detection result period caused by incomplete digestion or distillation in the traditional national standard method are overcome.
3. The configuration conditions of the direct sample introduction nitrogen and sulfur tester can simultaneously measure the nitrogen and sulfur in the sample, and the analysis time is shortened from hours of the traditional national standard method to only 6 minutes, thereby meeting the requirement of implementing supervision on the effectiveness of measuring the nitrogen and sulfur content in the aquatic products.
Drawings
FIG. 1: fitting a spectrogram by using a nitrogen standard curve;
FIG. 2: fitting a spectrogram of a sulfur standard curve;
FIG. 3: the linear relation of the nitrogen and sulfur is well related as can be seen from figure 1, figure 2 and figure 3 of the spectrograms of the nitrogen and sulfur standard curves, and instruments and conditions selected by the invention can completely meet the requirement of simultaneously and rapidly detecting the nitrogen and sulfur in aquatic products.
Detailed Description
The technical contents of the present invention will be described in detail below by way of examples with reference to the accompanying drawings, but the scope of the present invention is not limited in any way by the examples.
The aquatic products have various types and varieties, and representative laver, scallop, prawn and grilled fish fillet in the aquatic products are selected as verification examples.
Example 1: determination of nitrogen (N) and sulfur (S) in scallop:
a method for simultaneously and rapidly measuring the nitrogen and sulfur content in aquatic products comprises the following steps: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) a testing step, 4) instrument conditions used in an experiment, and 5) calculation and expression of results;
1) instruments and equipment: a direct sample introduction nitrogen and sulfur tester, a thermal conductivity cell detector and high-purity helium and oxygen; the direct sample introduction nitrogen and sulfur tester is developed for solving the technical problem of the invention;
(1) direct sample introduction nitrogen and sulfur tester: the device is provided with a solid sample introduction system, a two-stage purging device, two purifying and filling columns, 1 adsorption column, a nickel-chromium wire resistance furnace, a quartz tube, 2 gas path control systems and a tinfoil cup; the solid sample introduction system is sequentially connected with 2 purifying filling columns and 1 adsorption column, the quartz tube is positioned in the nickel-chromium wire resistance furnace, and 2 gas path control systems respectively control high-purity helium and oxygen;
(2) thermal conductivity cell detector part: the device is provided with a Mass Flow Controller (MFC), a gas circuit control system, a reference gas flow controller and a detector;
(3) high purity helium and oxygen;
2) preparation of a standard curve: respectively weighing 2.24, 4.25, 5.71, 10.81, 16.51, 21.78, 25.40 and 31.61mg of samples with nitrogen content (5.0 +/-0.3%) of laver GBW10023 (GSB-14), placing the samples in tin foil, placing the tin foil in a nickel-chromium wire resistance furnace for pyrolysis, and respectively adsorbing H by generated mixed gas through 2 purification columns2O and CO2The nitrogen oxides are reduced into N by copper in a nickel-chromium wire resistance furnace2，N2Loading high-purity helium gas into a thermal conductivity detector for measurement; heating SO2Adsorption column, SO2Analyzing from the adsorption column agent, loading high-purity helium into a thermal conductivity detector to detect the content of the helium, and drawing a standard curve by using the nitrogen-sulfur concentration and the fluorescence area of a thermal conductivity cell;
3) the testing steps are as follows:
weighing about 15.0mg of scallop standard substance GBW10024(N is 12.8 +/-0.8%; S is 1.5 +/-0.1%) in a tin foil cup, and measuring the nitrogen and sulfur value by using a direct sample injection nitrogen and sulfur tester;
4) conditions of the apparatus used for the experiment:
(1) conditions of a solid sample injection device: the purging time is 20 s; the pyrolysis temperature is 900 ℃, and the time is 100 s; the first purifying packed column filler is magnesium perchlorate and phosphorus pentoxide for adsorbing H2O; the second purifying and filling adsorption column has alkali asbestos and phosphorus pentoxide as stuffing for adsorbing CO2(ii) a The adsorption column is filled with carbon molecular sieve for adsorbing SO2；
(2) Conditions of the thermal conductivity cell instrument: the thermistor is 8K omega, the amplification circuit is 7 times, the carrier gas flow rate is 250mL/min, the reference gas flow rate is 50mL/min, and the reading time is 6(s);
5) and calculating and expressing the result:
drawing a standard working curve by using an external standard method in data processing software, storing the standard working curve, analyzing and processing the peak area of a sample, correcting by using an external standard to obtain the concentration of nitrogen and sulfur in the sample to be detected, and calculating according to the following formulas (1) and (2) to obtain the content of the substance to be detected in the sample:
X1＝C/m/100..............(1)
in the formula:
X1-the content of test substance N in the sample, g/100 g;
c, the concentration of N in the sample to be detected, mg;
m represents the sample weight and mg;
X2＝C/m/100..............(2)
in the formula:
X2-the content of the test substance S in the sample, g/100 g;
c, the concentration of S in the sample to be detected, mg;
m represents the sample weight and mg; the content of the substance to be measured in the sample can be obtained by the following calculation formula (1):
X＝C/m/10..............(1)
6. results and discussion:
TABLE 1 analytical Properties of the instruments
| Linear Range (mg) | Coefficient of correlation (R) | Detection limit (μ g/g) | RSD(％) |
| 2.0-100 | ﹥0.9999 | 0.66 | 3.79％ |
As can be seen from table 1 and fig. 1: the analysis performance of the instrument completely meets the requirement of measuring the nitrogen content;
TABLE 2 analytical Properties of the instruments
| Linear Range (mg) | Coefficient of correlation (R) | Detection limit (μ g/g) | RSD(％) |
| 2.0-100 | ﹥0.9998 | 2.29 | 5.44 |
As can be seen from table 2 and fig. 2: the analytical performance of the instrument completely meets the requirement of measuring the sulfur content; as can be seen from FIG. 3, the nitrogen and sulfur elements in the sample can be detected simultaneously.
TABLE 3 measurement results of N recovery in scallop standard substance
TABLE 4 measurement results of S recovery in scallop standard substance
As can be seen from tables 3 and 4, the measured recovery rate of N in the scallop standard substance is 100.2-102.8%, the recovery rate of S is 96.66-103.3%, the recovery effect is ideal, and the recovery effect meets the detection standard.
Example 2: determination of nitrogen (N) and sulfur (S) in fresh and alive prawn meat: the apparatus and equipment used were the same as in example 1.
Homogenizing the edible part of fresh prawn, weighing about 50.0mg in a tin foil cup, and measuring the nitrogen value by using a direct sample introduction nitrogen-sulfur tester; additionally, two 5.00g of the homogenate homogeneous sample are weighed, 0.9330g and 2.294g of prawn GB10050(N is 13.5%; S is 1.0%) which is a national standard substance are respectively added and put into a mortar for even development, and the background content of the prawn GB10050 is equivalent to 0.5 time and 1.0 time of N, 23 times and 32 times of S; respectively weighing about 50.0mg of the test sample in a tin foil cup, and measuring the nitrogen and sulfur values by using the instrument and equipment described in the embodiment 1; the other conditions were the same as those of the scallop in example 1, and the results of the normalized recovery of N and S from the fresh and alive prawn meat were measured (see tables 5 and 6).
TABLE 5 measurement results of N recovery in fresh prawn meat
TABLE 6 measurement results of S recovery in fresh prawn meat
As shown in Table 5 and Table 6, the results of the measurement of the normalized recovery rate of N in the fresh shrimp meat are 97.31-100.2%, the recovery rate of S is 96.93-105.5%, the recovery effect is ideal, and the detection standard is met.
Example 3: determination of nitrogen (N) sulfur (S) in grilled fish fillets:
cutting the baked fillet into pieces, crushing and uniformly mixing the pieces in a crusher, weighing about 20.0mg of the pieces in a tin foil cup, and measuring the nitrogen and sulfur values by using the instrument and equipment in the embodiment 1; in addition, two 1.00g of the uniformly crushed samples are weighed, 0.4167g and 1.4280g of the national standard substance prawn GB10050(N is 13.5 percent and S is 1.0 percent) are respectively added into the uniformly crushed samples to be uniformly crushed in a mortar, about 20.0mg of the samples are respectively weighed into tin foil cups according to the background content of the uniformly crushed samples which is 0.5 times and 1.0 times of N, 7.88 times and 14.76 times of S, and the nitrogen and sulfur values are measured by the instrument and the equipment which are described in the embodiment 1; the other conditions were the same as those of scallop, and the results of the recovery of N, S in the grilled fish fillet were measured (see tables 7 and 8).
TABLE 7 measurement results of recovery of N in grilled fish fillet under the standard
TABLE 8 measurement results of recovery of S from grilled fish fillet
As shown in Table 7 and Table 8, the recovery rate of N in the grilled fish fillet measured by the inventor is 95.33-101.3%, the recovery rate of S is 92.26-100.2%, and the recovery effect is ideal.
As described above, it can be seen from tables 1 and 2 that: the analytical performance of the combined instrument completely meets the requirement for measuring the content of nitrogen (N) and sulfur (S) in the dry and fresh aquatic products, and tables 3, 4, 5, 6, 7 and 8 show that the recovery rate of the standard substances and the standard samples is 92.26-105.5%, and the recovery effect is ideal. The selected instruments and instrument conditions, the gas separation and purification tube filling materials and the pretreatment of the sample are reasonable and in place. The method has the beneficial effects that the protein (N x 6.25) sulfur (S) in the aquatic product can be directly subjected to solid sample injection and simultaneously and rapidly analyzed and measured.
The method can accurately and reliably measure the N, S content in the aquatic product in only 6 minutes, and meets the current requirement on high timeliness of product quality safety monitoring.
Claims (1)
1. A method for simultaneously and rapidly measuring the nitrogen and sulfur content in aquatic products is characterized by comprising the following steps: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) a testing step, 4) instrument conditions used in an experiment, and 5) calculation and expression of results;
1) instruments and equipment:
(1) the direct sample introduction nitrogen and sulfur tester comprises a solid sample introduction system, a two-stage purging device, 2 purifying and filling columns, 1 adsorption column, a nickel-chromium wire resistance furnace, a quartz tube, 2 gas path control systems and a tin foil cup; the solid sample introduction system is sequentially connected with 2 purifying filling columns and 1 adsorption column, the quartz tube is positioned in the nickel-chromium wire resistance furnace, and 2 gas path control systems respectively control high-purity helium and oxygen;
(2) the thermal conductivity cell detector comprises a mass flow controller, a gas path control system, a reference gas flow controller and a detector;
(3) high purity helium and oxygen;
2) preparation of a standard curve: respectively weighing a sample of standard substance laver, placing in a tinfoil cup, placing in a nickel-chromium wire resistance furnace, performing pyrolysis, sequentially passing through 2 purifying and filling columns to respectively adsorb H2O and CO2The nitrogen oxides are reduced into N by copper in a nickel-chromium wire resistance furnace2，N2Loading high-purity helium gas into a thermal conductivity detector for measurement; heating the adsorption column, SO2Analyzing from the adsorption column agent, loading helium into a thermal conductivity detector to detect the content of the helium, and drawing a standard curve by using the nitrogen-sulfur concentration and the fluorescence area of a thermal conductivity cell;
3) the testing steps are as follows:
uniformly mixing the crushed samples, placing the mixture in a tin foil cup, and measuring the nitrogen and sulfur value by using the instrument and equipment in the step 1), wherein the detection method is the same as the preparation of the standard curve in the step 2);
4) conditions of the apparatus used for the experiment:
(1) conditions of the solid sample injection system: the purging time is 20 s; the pyrolysis temperature is 900 ℃, and the time is 100 s; the first purifying packed column is used for adsorbing H2O; the second purifying packed column is used for adsorbing CO2(ii) a The adsorption column is used for adsorbing SO2；
(2) Thermal conductivity cell detector conditions: the thermistor is 8K omega, the amplification circuit is 7 times, the carrier gas flow rate is 250mL/min, the reference gas flow rate is 50mL/min, and the reading time is 6(s);
5) and calculating and expressing the result:
drawing a standard working curve by using an external standard method in data processing software, storing the standard working curve, analyzing and processing the peak area of a sample, correcting by using an external standard to obtain the concentration of nitrogen and sulfur in the sample to be detected, and calculating according to the following formulas (1) and (2) to obtain the content of the substance to be detected in the sample:
X1＝C/m/100..............(1)
in the formula:
X1-the content of test substance N in the sample, g/100 g;
c, the concentration of N in the sample to be detected, mg;
m represents the sample weight and mg;
X2＝C/m/100..............(2)
in the formula:
X2-the content of the test substance S in the sample, g/100 g;
c, the concentration of S in the sample to be detected, mg;
m represents the sample amount, mg.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111095144.6A CN113777202A (en) | 2021-09-17 | 2021-09-17 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
| CN202210708575.3A CN115047126A (en) | 2021-09-17 | 2022-06-22 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111095144.6A CN113777202A (en) | 2021-09-17 | 2021-09-17 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113777202A true CN113777202A (en) | 2021-12-10 |
Family
ID=78851880
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111095144.6A Pending CN113777202A (en) | 2021-09-17 | 2021-09-17 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
| CN202210708575.3A Pending CN115047126A (en) | 2021-09-17 | 2022-06-22 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210708575.3A Pending CN115047126A (en) | 2021-09-17 | 2022-06-22 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN113777202A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047126A (en) * | 2021-09-17 | 2022-09-13 | 中国水产科学研究院黄海水产研究所 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1707253A1 (en) * | 2005-03-29 | 2006-10-04 | Elementar Analysensysteme GmbH | Method and device for simultaneous determination of isotope ratios of light elements |
| CN102004118A (en) * | 2009-12-19 | 2011-04-06 | 深圳市芭田生态工程股份有限公司 | Method for determining carbon, sulfur and chlorine in fertilizer |
| CN102053126A (en) * | 2010-11-04 | 2011-05-11 | 云南出入境检验检疫局检验检疫技术中心 | Method for measuring nitrogen, hydrogen, carbon and sulfur in tree moss concrete |
| CN107917969A (en) * | 2016-10-10 | 2018-04-17 | 赛默飞世尔科学股份有限公司 | Elemental analyser |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO20010895A1 (en) * | 2001-09-19 | 2003-03-19 | Eurovector S P A | SAMPLING DEVICE, PARTICULARLY FOR AUTOMATIC ELEMENTARY ANALYZERS. |
| CN103091136B (en) * | 2011-11-04 | 2015-04-29 | 核工业北京地质研究院 | Device for analyzing and pretreating carbon isotope in organic matter sample |
| CN102636659B (en) * | 2012-05-09 | 2014-04-23 | 长沙瑞翔科技有限公司 | Automatic sampling device |
| CN109212248B (en) * | 2018-07-20 | 2024-02-13 | 北京诺德泰科仪器仪表有限公司 | Ball valve purging device and method for solid sample injector of elemental analyzer |
| CN109557226A (en) * | 2018-12-04 | 2019-04-02 | 中国科学院地质与地球物理研究所 | It is a kind of for measuring the sampling system and its sample injection method of nitrogen isotope |
| CN113777202A (en) * | 2021-09-17 | 2021-12-10 | 中国水产科学研究院黄海水产研究所 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
-
2021
- 2021-09-17 CN CN202111095144.6A patent/CN113777202A/en active Pending
-
2022
- 2022-06-22 CN CN202210708575.3A patent/CN115047126A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1707253A1 (en) * | 2005-03-29 | 2006-10-04 | Elementar Analysensysteme GmbH | Method and device for simultaneous determination of isotope ratios of light elements |
| CN102004118A (en) * | 2009-12-19 | 2011-04-06 | 深圳市芭田生态工程股份有限公司 | Method for determining carbon, sulfur and chlorine in fertilizer |
| CN102053126A (en) * | 2010-11-04 | 2011-05-11 | 云南出入境检验检疫局检验检疫技术中心 | Method for measuring nitrogen, hydrogen, carbon and sulfur in tree moss concrete |
| CN107917969A (en) * | 2016-10-10 | 2018-04-17 | 赛默飞世尔科学股份有限公司 | Elemental analyser |
Non-Patent Citations (5)
| Title |
|---|
| ELEMENTAR: "元素分析仪 vario MACRO cube说明书", 《HTTPS://WWW.DOCIN.COM/P-1521597241.HTML》 * |
| FIBROSIS789: "有机元素分析", 《HTTPS://WWW.DOCIN.COM/P-2023823030.HTML》 * |
| MANUELA DITTMAR 等: "Organic Elemental Composition in Fingernail Plates Varies between Sexes and Changes with Increasing Age in Healthy Humans", 《GERONTOLOGY》 * |
| 尚妍 等: "生物质CHNS含量测定影响因素的实验研究", 《实验室科学》 * |
| 马蜀 等: "城市污水处理厂剩余污泥的元素含量分析", 《中国给水排水》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047126A (en) * | 2021-09-17 | 2022-09-13 | 中国水产科学研究院黄海水产研究所 | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115047126A (en) | 2022-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Suzuki et al. | A high-temperature catalytic oxidation method for the determination of dissolved organic carbon in seawater: analysis and improvement | |
| Twine et al. | The determination of phosphorus in Kjeldahl digests of plant material by automatic analysis | |
| US3540851A (en) | Method of determining trace amounts of gases | |
| CN102778541A (en) | Device and method for calibrating gas sensor | |
| CN113777202A (en) | Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products | |
| Sullivan et al. | Determination of total iodine in foods and dietary supplements using inductively coupled plasma–mass spectrometry | |
| US3025142A (en) | Method and means of detecting ammonia and amine vapor | |
| CN106501346A (en) | A kind of method of trimethylamine in quick detection aquatic products | |
| US20080276686A1 (en) | Method for analyzing gas components, apparatus for separating gas components and method for identifying the same | |
| Buckee et al. | Determination of ethanol in beer by gas chromatography (direct injection)—collaborative trial | |
| CN105675694A (en) | Smoke component concentration measurement system and smoke component concentration measurement method | |
| CN106770725B (en) | A kind of method of dinocap residual quantity in quick measurement vegetable and fruit | |
| CN112684085A (en) | Method for detecting histamine content in fish meal | |
| CN103115977A (en) | Method for rapidly detecting phosphorus hydride residue in tobaccos and tobacco products | |
| CN116242821A (en) | Preparation method of colorimetric chip for detecting food spoilage marker gas | |
| Espalha et al. | Fast and direct detection of biogenic amines in fish by GC-IMS technology | |
| Xiaowei et al. | A paper-based ratiometric fluorescent sensor for NH3 detection in gaseous phase: Real-time monitoring of chilled chicken freshness | |
| CN209656614U (en) | A kind of gas component on-line measurement device | |
| CN105651933A (en) | Method for detecting protein in feed | |
| CN102539222A (en) | Determination of total nitrogen of tobacco and tobacco products through element analysis method | |
| CN106338510A (en) | Rapid detection method for lead content of halal beef and mutton | |
| CN109406429A (en) | A method of the atomic absorption spectroscopy determination content of heavy metal lead without matrix modifier | |
| Chang | Potentiometric titration of free amine and amine carbonate in carbonated monoethanolamine solutions | |
| Carter et al. | The use of an oxygen bomb as an alternative method for digestion of fish tissue for total mercury analysis | |
| CN114814040B (en) | Method for detecting residual quantity of methyl bromide in tea |
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: 20211210 |
|
| WD01 | Invention patent application deemed withdrawn after publication |