CN108871917A - The analysis method of heavy metal element chromium and lead in a kind of quick detection vegetable oil - Google Patents
The analysis method of heavy metal element chromium and lead in a kind of quick detection vegetable oil Download PDFInfo
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- CN108871917A CN108871917A CN201810993798.2A CN201810993798A CN108871917A CN 108871917 A CN108871917 A CN 108871917A CN 201810993798 A CN201810993798 A CN 201810993798A CN 108871917 A CN108871917 A CN 108871917A
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- 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
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
Abstract
The invention discloses the analysis method of heavy metal element chromium and lead in a kind of quickly detection vegetable oil, step includes：Plant oil samples are accurately weighed in centrifuge tube, then be added concentration be 10%~50% nitric acid and 1%~20% nonionic surface active agent and a small amount of ethyl alcohol composition extract liquor, the oscillation extraction time is 1min~30min, it is subsequently placed in centrifuge and is centrifuged 10min, the transparent acid water phase extract liquor of stratification Hou Qu lower layer, and lower layer's transparent acid aqueous phase solution is pipetted in vial with liquid-transfering gun, the Matrix effects modifier and constant volume of metallic element to be measured is added, the content of each heavy metal element is directly measured with Atomic Absorption Spectrometer to acid water phase extract liquor.The present invention is first to heavy metal element in plant oil samples through micro-extraction technique separation and concentration, and combination atomic absorption spectrography (AAS) detects the content of chromium and lead.The method of the present invention is to the extraction efficiency of chromium and lead up to 98.2% or more, and method detection is limited to 0.0085mg/kg, and method is quantitatively limited to 0.0255mg/kg, relative standard deviation 0.3%.
Description
Technical field
The invention belongs to technical field of food safety detection, and in particular to a kind of quickly to detect heavy metal element in vegetable oil
The analysis method of chromium and lead.
Background technique
With China's process of industrialization accelerate, the environmental contaminants such as heavy metal element may Pollution Plant, especially pass through
Ji property crops.And a kind of product of the edible vegetable oil as enrichment method after crops processing, it is golden in raw material growth course
Category migration of elements, vegetable oil squeezing or extraction processing program and storage transport etc. are possible to by heavy metal element in the process
Pollution, the physically and mentally healthy problem of content of beary metal relationship eater whether up to standard in vegetable oil often eats heavy metals exceeding standard
Vegetable oil, heavy metal element can slowly be put aside in human body, and generate bioaccumulation effect, so as to cause subacute or chronic
Poisoning, endangers the health of people.
In order to ensure daily life healthy diet safety, China is in GB19641-2015 national food safety standard
In edible vegetable oil material the content of beary metal such as the harmful element in edible oil such as lead, chromium have been made with stringent regulation.However
In existing vegetable oil in the analysis method of heavy metal element, Sample Pretreatment Technique is mainly traditional resolution method (comprising microwave
Resolution method), ashing method, extraction etc., very little, resolution that there are sample volumes when these pretreatment technologies handle plant oil samples
The disadvantages of time is long, and resolution effect is poor, and chemical reagent consumption amount is big.
Currently, liquid-liquid dispersions micro-extraction technique is a kind of liquid-liquid extraction techniques of novel micromation, and extractant is dispersing
The superfine droplet that dispersion is formed under the action of agent, mixes well with sample solution, in a relatively short period of time, target analytes
It can reach extraction partition equilibrium in the solution.Liquid-liquid dispersions micro-extraction technique in water analysis extraction and separation metal ion,
The research of organic compound etc. compare into it is more, but in vegetable oil extraction and separation heavy metal element research report very
It is few.So carrying out the quick separating analysis method of heavy metal element chromium and lead in vegetable oil using plant oil samples as research object
Research, to push food analysis technology fast development have important practical application value.
Summary of the invention
In view of this, it is an object of that present invention to provide the analyses of heavy metal element chromium and lead in a kind of quickly detection vegetable oil
Method is mainly fats non-polar component according to vegetable oil matrix, and heavy metal element is complexed by fatty acid in vegetable oil, is utilized
Highly acid extract liquor extracts the heavy metal element of fatty acid complexing in vegetable oil, and nonpolar dispersing agent assists acid solution effectively to divide
It is scattered to and increases the probability that heavy metal element is extracted in vegetable oil, to realize that chromium and lead are efficiently separated from vegetable oil, to obtain
The acid aqueous phase solution of chromium and lead must be contained, then pass through acid aqueous phase solution of the atomic absorption light spectrometer analysis containing chromium and lead, with
The content of heavy metal chromium and lead in vegetable oil is determined, the method is fast and effective.
For achieving the above object, technical solution as described below is specifically provided：
The analysis method of heavy metal element chromium and lead, includes the following steps in a kind of quick detection vegetable oil：
1) prepare sample：Plant oil samples are pipetted in centrifuge tube；
2) liquid-liquid micro-extraction separation process：Using polyethylene glycol to isooctyl phenyl ether as dispersing agent, volume ratio 5：1 it is dilute
Nitric acid and alcohol mixed solution are as extractant, by plant oil samples, dispersing agent, extractant with volume ratio 5：0.5：0.5~3 is mixed
It closes, extraction, oscillation, centrifugation, standing observe that solution is divided into three layers：Upper layer is vegetable oil phase, and middle layer is that milky is cotton-shaped organic
Phase, lower layer are transparent acid water phase, and lower layer is that transparent acid water phase is sample to be tested；
3) prepare standard solution：Prepare blank mother liquor and chromium standard mother liquor and lead standard mother liquor；
4) standard curve is formulated：Absorption standard blank solution and chromium standard mother liquor, lead standard mother liquor are prepared different dense respectively
The chromium standard working solution and lead standard working solution for spending gradient, carry out background correction using Zeemen effect, use is non-linear automatically
By balance method fit standard curve, and the unary regression equation of absorbance value and chromium concn relationship, absorbance are acquired respectively
The unary linear regression equation of value and lead concentration relationship, related coefficient are all larger than 0.9999；
5) aas determination tenor：Lower layer's transparent acid aqueous phase solution, which is pipetted, with liquid-transfering gun is placed in vial
In, heavy metal element matrix modifier to be measured is added, water phase extract liquor is measured with graphite furnace atomic absorption spectrophotometer, surveys
The absorbance peak area for obtaining chromium and lead, substitutes into corresponding unary linear regression equation respectively, acquires heavy metal element in vegetable oil
The content of chromium and lead.
Preferably, the polyethylene glycol is 1%~20% to isooctyl phenyl ether volumetric concentration, and the dust technology volume is dense
Degree is 10%~50%, and the ethyl alcohol is dehydrated alcohol.
Preferably, the polyethylene glycol is 10% to isooctyl phenyl ether volumetric concentration, and the dust technology volumetric concentration is
20%, dust technology and ethyl alcohol volume ratio are 5 in the extractant：1.
Preferably, oscillation 1min~30min becomes milky emulsion to solution, and being placed in temperature is 20 DEG C~80 DEG C constant temperature
Delamination is observed in water bath, is subsequently placed in supercentrifuge and is centrifuged 10min, is stood observation solution and is divided into three layers.
It is further preferred that oscillation 20min becomes milky emulsion to solution, being placed in temperature is 40 DEG C of constant temperature water baths
Middle observation delamination.
Preferably, the test condition of graphite furnace atomic absorption spectrophotometer measurement chromium is：120 DEG C of drying temperature, drying time
30s, 1200 DEG C of ashing temperature, ashing retention time 20s, 2200 DEG C of atomization temperature, atomization retention time 5s, analysis wavelength
357.87nm, 20 μ L of sampling volume；Graphite furnace atomic absorption spectrophotometer measurement lead test condition be：120 DEG C of drying temperature is done
Dry time 30s, 700 DEG C of ashing temperature, ashing retention time 20s, 2200 DEG C of atomization temperature, atomization retention time 5s, divide
Analyse wavelength 283.3nm, 20 μ L of sampling volume.
Preferably, the matrix modifier of heavy metal element chromium is magnesium nitrate, and the matrix modifier of heavy metal element lead is chlorine
Change palladium and nitric acid magnesium compound.
The beneficial effects of the invention are that：To the extraction efficiency of chromium and lead up to 98.2% or more, method detects the method for the present invention
It is limited to 0.0085mg/kg, method is quantitatively limited to 0.0255mg/kg, relative standard deviation 0.3%.It is former based on the present invention
Reason is simple, and easy to operate, workload is small, environmentally protective, is able to achieve quick separating analysis, and the reproducibility of method is good, and should
Analysis method is suitable for that base promotes and applies.The present invention provides technology branch for the analysis of heavy metal element chromium and lead in edible vegetable oil
Support, to the development important in inhibiting and wide application value of food analysis technology.
Specific embodiment
More detailed elaboration is carried out to the present invention below in conjunction with specific embodiment.
Formulate standard curve：
1) prepare standard solution：Prepare blank mother liquor and chromium standard mother liquor and lead standard mother liquor；
2) standard curve is formulated：Absorption standard blank solution and chromium standard mother liquor, lead standard mother liquor are prepared different dense respectively
The chromium standard working solution and lead standard working solution for spending gradient, carry out background correction using Zeemen effect, use is non-linear automatically
By balance method fit standard curve, and the unary regression equation of absorbance value Yu chromium concn relationship is acquired respectively, be labeled as
Equation A；The unary linear regression equation of absorbance value and lead concentration relationship is labeled as equation B；Related coefficient is all larger than
0.9999。
Graphite furnace atomic absorption spectrophotometer measures heavy metal element chromium and the instrument test condition difference of lead is as shown in table 1：
The instrument test condition of table 1 measurement heavy metal element chromium and lead
Standard curve formulation is carried out according to the method described above, and the detection of following examples is carried out referring to above-mentioned test condition.
Embodiment 1
The analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil, carries out in accordance with the following steps：
1) prepare sample：5g plant oil samples are pipetted in 15ml centrifuge tube；
2) liquid-liquid micro-extraction separation process：Using polyethylene glycol, to isooctyl phenyl ether, as dispersing agent, (mass concentration is
10%), volume ratio 5：1 nitric acid (volume fraction 5%) and dehydrated alcohol mixed solution is as extractant, by plant oil sample
Product, dispersing agent, extractant are with volume ratio 5：0.5：1.5 mix, and mediate extraction oscillation 20min under normal temperature condition, after extraction,
It is subsequently placed in rapid centrifugation 10min in centrifuge, observes that solution is divided into three layers：Upper layer is vegetable oil phase, and middle layer is milky
Cotton-shaped organic phase, lower layer are transparent acid water phase.Transparent acid water phase is sample to be tested；
3) aas determination tenor：Lower layer's transparent acid aqueous phase solution, which is pipetted, with liquid-transfering gun is placed in vial
In, heavy metal element matrix modifier to be measured is added, water phase extract liquor is measured with graphite furnace atomic absorption spectrophotometer, surveys
The absorbance peak area for obtaining chromium and lead, substitutes into corresponding unary linear regression equation A and B respectively, acquires heavy metal in vegetable oil
The content of elemental chromium and lead.
After the same method, respectively the volume fraction (concentration) of extractant nitric acid be 10%, 15%, 20%, 25%,
30%, 40%, 50% when equally tested.Increase of the experiment discovery with nitric acid solution concentration, the inspection of each heavy metal element
Output is also more, but after concentration of nitric acid reaches 20%, and when concentration of nitric acid is further continued for increasing, the detected level of heavy metal element is held
Flat or reduction.Since concentration of nitric acid is increasing, the content of extractant is bigger, so that extraction yield also just increases, extraction efficiency
It is higher.But after extractant concentration is more than certain value, so that organic phase increases, and extract liquor is less, thus heavy metal in water phase
Elemental chromium and the concentration of lead also accordingly reduce.Therefore the optimal use concentration of nitric acid is 20%.
Embodiment 2
The analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil, carries out in accordance with the following steps：
1) prepare sample：5g plant oil samples are pipetted in 15ml centrifuge tube；
2) liquid-liquid micro-extraction separation process：Using polyethylene glycol to isooctyl phenyl ether as dispersing agent (mass concentration 1%),
Volume ratio is 5：1 nitric acid (volume fraction 20%) and dehydrated alcohol mixed solution by plant oil samples, divides as extractant
Powder, extractant are with volume ratio 5：1：1 mixes, and mediate extraction oscillation 20min under normal temperature condition, after extraction, is subsequently placed in
Rapid centrifugation 10min in centrifuge observes that solution is divided into three layers：Upper layer is vegetable oil phase, and middle layer is that milky is cotton-shaped organic
Phase, lower layer are transparent acid water phase.Transparent acid water phase is sample to be tested；
3) aas determination tenor：Lower layer's transparent acid aqueous phase solution, which is pipetted, with liquid-transfering gun is placed in vial
In, heavy metal element matrix modifier to be measured is added, water phase extract liquor is measured with graphite furnace atomic absorption spectrophotometer, surveys
The absorbance peak area for obtaining chromium and lead, substitutes into corresponding unary linear regression equation A and B respectively, acquires heavy metal in vegetable oil
The content of elemental chromium and lead.
After the same method, respectively dispersing agent polyethylene glycol to isooctyl phenyl ether concentration be 2%, 5%, 10%,
It is equally tested when 20%.The concentration that experiment discovery Qula leads to-X114 significantly affects the extraction efficiency of arsenic.As dispersing agent is dense
Degree increases, and the extraction efficiency of heavy metal element is higher, but after dispersant concentration is more than 10%, dispersing agent excessively causes to extract
Agent, which is dissolved in sample solution, preferably to be separated, so that the extraction efficiency of heavy metal element reduces.Therefore by polyethylene glycol pair
The optimal use concentration of isooctyl phenyl ether is 10%.
Embodiment 3
The analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil, carries out in accordance with the following steps：
1) prepare sample：5g plant oil samples are pipetted in 15ml centrifuge tube；
2) liquid-liquid micro-extraction separation process：Using polyethylene glycol, to isooctyl phenyl ether, as dispersing agent, (mass concentration is
10%), volume ratio 5：1 nitric acid (volume fraction 20%) and dehydrated alcohol mixed solution is as extractant, by vegetable oil
Sample, dispersing agent, extractant are with volume ratio 5：1：1 mixes, and mediate extraction oscillation 1min under normal temperature condition, after extraction, so
It is placed on rapid centrifugation 10min in centrifuge, observes that solution is divided into three layers：Upper layer is vegetable oil phase, and middle layer is milky wadding
Shape organic phase, lower layer are transparent acid water phase.Transparent acid water phase is sample to be tested；
3) aas determination tenor：Lower layer's transparent acid aqueous phase solution, which is pipetted, with liquid-transfering gun is placed in vial
In, heavy metal element matrix modifier to be measured is added, water phase extract liquor is measured with graphite furnace atomic absorption spectrophotometer, surveys
The absorbance peak area for obtaining chromium and lead, substitutes into corresponding unary linear regression equation A and B respectively, acquires heavy metal in vegetable oil
The content of elemental chromium and lead.
After the same method, it is carried out respectively when mediating and vibrating 5.0min, 10min, 15min, 20min, 30min same
Experiment.Experiment discovery, when originally extraction time is shorter, extraction not exclusively, with gradually increasing for extraction time, the weight that extracts
Metal element content is also the more.When extraction time reaches 15min, extraction has basically reached balance, therefore the extraction oscillation that will mediate
20min。
Embodiment 4
Laboratory operating procedures with embodiment 3, unlike respectively change ethanol consumption be 0.1mL, 0.2,0.3mL,
It is equally tested when 0.4mL.Experiment discovery, the addition of ethyl alcohol has apparent effect to the effect of extracting of experiment, with ethyl alcohol
The increase of amount, extraction equilibrium speed are accelerated, and the extraction equilibrium time is substantially stable after 0.2mL is added, therefore selection ethanol consumption is
0.2mL。
Embodiment 5
Laboratory operating procedures with embodiment 3, unlike, respectively hybrid extraction liquid be 1.0mL, 1.5mL, 2.0mL,
It is equally tested when 2.5mL, 3.0mL.When extract liquor dosage is very few, extractant is very few, and enrichment times are lower, and extractant
With sample undercompounding, as extract liquor dosage increases, the contact area face of extractant and determinand is big, improves extraction effect
Rate.But after extract liquor dosage is more than 1.0mL, milkiness organic phase obtained in extraction process also increases, and enrichment times are instead
It reduces.Therefore the dosage of acidizing extraction mixed liquor is set to 1.0mL.
Embodiment 6
Laboratory operating procedures are with embodiment 3, the difference is that not carrying out when bath temperature is 40 DEG C, 60 DEG C, 80 DEG C same
Experiment.Experiment discovery temperature is not significant on influencing during the micro-extraction, and with the rising of temperature, and extraction yield is on slightly
The trend of liter, from the aspect of reducing instrument and energy conservation to the greatest extent, selection is tested at 40 DEG C.
Embodiment 7
Six kinds of different materials (vegetable seed, soybean, corn, peanut, sunflower seeds, ready-mixed oil) plant oil samples are accurately weighed respectively
5g accurately weighs plant oil samples 5g and has in plug centrifuge tube in 15mL, with polyethylene glycol pair in six 15mL tool plug centrifuge tubes
Isooctyl phenyl ether is dispersing agent (mass concentration 10%), volume ratio 5：1 nitric acid (volume fraction 20%) and anhydrous
Alcohol mixed solution is as extractant, by plant oil samples, dispersing agent, extractant with volume ratio 5：1：1 mixing, extraction vibration of mediating
20min is swung, the constant temperature extracting at 40 DEG C after extraction, is subsequently placed in rapid centrifugation 10min in supercentrifuge, stands and see
It examines solution and is divided into three layers：Upper layer is vegetable oil phase, and middle layer is the cotton-shaped organic phase of milky, and lower layer is transparent acid water phase.With shifting
Liquid rifle pipettes lower layer's transparent acid aqueous phase solution respectively and is placed in six vials, is separately added into heavy metal element matrix to be measured
Modifier measures the content of each heavy metal element to water phase extract liquor respectively with graphite furnace atomic absorption spectrophotometer.Pass through experiment
Test, commercially available edible rapeseed oil, soybean oil, corn oil, peanut oil, sunflower oil, each heavy metal member in edible blend oil
Plain chromium and lead content be not exceeded.Chromium content is respectively：0.059mg/Kg,0.095mg/Kg,0.083mg/Kg,
0.081mg/Kg,0.078mg/Kg,0.094mg/Kg.Lead element content is respectively：0.049mg/Kg,0.084mg/Kg,
0.055mg/Kg,0.059mg/Kg,0.046mg/Kg,0.063mg/Kg.It is non-with detected content by other detection methods
Very close to.
Determine that for the heavy metal element chromium and lead studied, the optimal parameter of this method is from embodiment：Extraction
Agent concentration of nitric acid is 20%, and dispersing agent polyethylene glycol is 10%, ethanol consumption 0.2mL, extraction to isooctyl phenyl ether concentration
The dosage of solution is 1.0mL, and extraction duration of oscillation is 20min, and extraction temperature is 40 DEG C.The method established and national standard side
When method analyzes same sample, for national standard method, the extraction for the liquid-liquid dispersions micro-extracting method established
Taking rate to reach is 98% or more, and the detection of method is limited to 0.0085mg/kg, is quantitatively limited to 0.0255mg/kg, and relative standard deviation is
0.3%.
It is simple to actual sample analytic explanation this method, quick, effective by embodiment, it can be used for various material plants
The analysis of heavy metal element chromium and lead in oil.For there are heavy metal elements that may be present in animal fat, in example
After parameter advanced optimizes, it is contemplated that the present invention may be use in animal fat heavy metal element analysis.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (7)
1. the analysis method of heavy metal element chromium and lead in a kind of quickly detection vegetable oil, which is characterized in that include the following steps：
1) prepare sample：Plant oil samples are pipetted in centrifuge tube；
2) liquid-liquid micro-extraction separation process：Using polyethylene glycol to isooctyl phenyl ether as dispersing agent, volume ratio 5：1 dust technology
With alcohol mixed solution as extractant, by plant oil samples, dispersing agent, extractant with volume ratio 5：0.5：0.5~3 mixing,
Extraction, oscillation, centrifugation, standing observe that solution is divided into three layers：Upper layer is vegetable oil phase, and middle layer is the cotton-shaped organic phase of milky,
Lower layer is transparent acid water phase, and lower layer is that transparent acid water phase is sample to be tested；
3) prepare standard solution：Prepare blank mother liquor and chromium standard mother liquor and lead standard mother liquor；
4) standard curve is formulated：Absorption standard blank solution and chromium standard mother liquor, lead standard mother liquor prepare various concentration ladder respectively
The chromium standard working solution and lead standard working solution of degree, carry out background correction using Zeemen effect automatically, are passed through with non-linear
Balance method fit standard curve, and acquire respectively the unary regression equation of absorbance value and chromium concn relationship, absorbance value with
The unary linear regression equation of lead concentration relationship, related coefficient are all larger than 0.9999；
5) aas determination tenor：Lower layer's transparent acid aqueous phase solution is pipetted with liquid-transfering gun to be placed in vial,
Heavy metal element matrix modifier to be measured is added, water phase extract liquor is measured with graphite furnace atomic absorption spectrophotometer, is measured
The absorbance peak area of chromium and lead, substitutes into corresponding unary linear regression equation respectively, acquires heavy metal element chromium in vegetable oil
With the content of lead.
2. a kind of analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil according to claim 1, feature
Be, the polyethylene glycol to isooctyl phenyl ether volumetric concentration be 1%~20%, the dust technology volumetric concentration be 10%~
50%, the ethyl alcohol is dehydrated alcohol.
3. a kind of analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil according to claim 1, feature
It is, the polyethylene glycol is 10% to isooctyl phenyl ether volumetric concentration, and the dust technology volumetric concentration is 20%, the extraction
Taking dust technology and ethyl alcohol volume ratio in agent is 5：1.
4. a kind of analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil according to claim 1, feature
It is, vibrating 1min~30min to solution becomes milky emulsion, and being placed in temperature is to see in 20 DEG C~80 DEG C constant temperature water baths
Delamination is examined, is subsequently placed in supercentrifuge and is centrifuged 10min, observation solution is stood and is divided into three layers.
5. a kind of analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil according to claim 4, feature
It is, vibrating 20min to solution becomes milky emulsion, and being placed in temperature is to observe delamination in 40 DEG C of constant temperature water baths.
6. a kind of analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil according to claim 1, feature
It is, the test condition of graphite furnace atomic absorption spectrophotometer measurement chromium is：120 DEG C of drying temperature, drying time 30s, ashing temperature
Degree 1200 DEG C, ashing retention time 20s, 2200 DEG C of atomization temperature, atomization retention time 5s, analysis wavelength 357.87nm,
20 μ L of sampling volume；Graphite furnace atomic absorption spectrophotometer measurement lead test condition be：120 DEG C of drying temperature, drying time
30s, 700 DEG C of ashing temperature, ashing retention time 20s, 2200 DEG C of atomization temperature, atomization retention time 5s, analysis wavelength
283.3nm, 20 μ L of sampling volume.
7. a kind of analysis method for quickly detecting heavy metal element chromium and lead in vegetable oil according to claim 1, feature
It is, the matrix modifier of heavy metal element chromium is magnesium nitrate, and the matrix modifier of heavy metal element lead is palladium chloride and nitric acid
Magnesium compound.
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| CN109975267A (en) * | 2019-03-05 | 2019-07-05 | 江苏大学 | A method of fusion liquid-liquid micro-extraction and SERS technology detect chromium ion |
| CN110568199A (en) * | 2019-09-12 | 2019-12-13 | 重庆科技学院 | Multi-channel fluorescence immunochromatography detection micro-fluidic chip |
| CN110568203A (en) * | 2019-09-12 | 2019-12-13 | 重庆科技学院 | Application method of multi-channel fluorescence immunochromatographic microfluidic chip |
| CN110609004A (en) * | 2019-09-26 | 2019-12-24 | 武汉海关技术中心 | Analysis and detection method for chromium metal element in solid food sample |
| CN112362599A (en) * | 2020-10-19 | 2021-02-12 | 浙江元臻机电工程有限公司 | Real-time online monitoring and analyzing method for oil products |
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