CN110132956A - The rapid assay methods of Zn content in a kind of fertilizer - Google Patents
The rapid assay methods of Zn content in a kind of fertilizer Download PDFInfo
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Abstract
The invention discloses a kind of rapid assay methods of Zn content in fertilizer, are measured with EDTA titration by following steps: 1) claiming sample；2) it soaks；3) sample is dissipated；4) molten sample；5) fixed molten；6) add screening agent；7) pH is adjusted；Wherein, claim to weigh 5.0~5.1g sample with electronic balance when sample, be placed on spare in 200ml beaker；When wetting, sample is soaked with a little distilled water；When dissipating sample, 10ml hydrochloric acid solution is added, gently shakes beaker, sample is made to scatter in acid solution；When molten sample, beaker is placed on hot plate, covers watch glass, heating causes test solution slightly boiled, firepower is turned down, so that test solution is kept slightly boiled 15min, during which gently shakes beaker 2-3 times；When fixed molten, 100 ml of constant volume, filtering takes 25 ml test solutions spare in 300ml conical flask；Sampling, is added plus screening agent shakes up, and then carries out pH adjusting, and pH carries out titration using EDTA standard solution after the completion of adjusting and solves the problems, such as that the costly enterprise that is unfavorable for of aas determination zinc produces.
Description
Technical field
The present invention relates to specific ion concentration method and technology field is measured using titration in a kind of chemistry, and in particular to
The rapid assay methods of Zn content in a kind of fertilizer.
Background technique
Ammonium phosphate product is common compound chemical fertilizer in agricultural planting, mainly contains two kinds of nutritional ingredients of phosphorus and nitrogen, than
Weigh 1.619, it is soluble easily in water, do not dissolve in ethyl alcohol.There is certain hygroscopicity, easily decomposed in humid air, volatilizes ammonia and become phosphoric acid
Ammonium dihydrogen.Aqueous solution is in alkalescent, pH8.0.Diammonium phosphate (DAP) is a kind of quick-acting fertilizer of high concentration, be suitable for various crops and
Soil needs the crop of phosphorus especially suitable for happiness ammonium, makees base manure or top dressing, preferably deep to apply.
The market demands chemical fertilizer traditional forms of enterprises adjusts the product mix, greatly develops new-type fertilizer, really realizes " weight-reducing synergy ".
Over one year recently, various middle and trace element fertilizer products are such as emerged rapidly in large numbersBamboo shoots after a spring rain, and put into market one after another.Zinc crop growth is necessary
Important microelement, therefore, fertilizer enterprises can add Zn-ef ficiency in the product and carry out enhanced products function, while can also promote production
The market competitiveness of product.
The content of zinc is necessary in test chemical fertilizer, and Chang Guoji, domestic zinc are measured usually using atomic absorption method, atom
One ten thousand RMB of atomic absorption instrument price about 30-50 of absorption process, general small business cannot undertake, therefore, not have
It is equipped with the enterprise of Atomic absorption, when producing fertilizer containing Zn, sample is only sent to qualified testing agency and is detected, is detected
The testing cost of mechanism is 100-150 member/item and the time cycle is longer, and generally requiring one week could go out as a result, this controls production
It is lagged very much for system, this just needs a kind of simple, the quick method for measuring Zn content in fertilizer.
EDTA titration, also known as " EDTA titration ".A kind of compleximetry.EDTA (i.e. ethylenediamine tetrem
Acid) it is a kind of very strong complexing agent, stable complex compound can be formed with many metal ions.Utilize the complexing of it and metal ion
Based on reaction, titration end-point is determined using the discoloration of metal indicator or electricity, optical means, according to the dosage of standard solution
Calculate the content of measured matter.This method can directly or indirectly measure about 70 kinds of elements.It is the most frequently used to measure calcium and magnesium.By grinding
Study carefully EDTA titration and has very much productivity effect to measure zinc.
Summary of the invention
EDTA titration is used the purpose of the present invention is to provide a kind of, quickly to be measured to Zn content in fertilizer,
It solves the problems, such as that aas determination zinc is costly and is unfavorable for enterprise's production.
In order to solve the above technical problems, the invention adopts the following technical scheme:
The rapid assay methods of Zn content in a kind of fertilizer pass through following steps with EDTA titration and measure:
1) claim sample；
2) it soaks；
3) sample is dissipated；
4) molten sample；
5) fixed molten；
6) add screening agent；
7) pH is adjusted；
8) it titrates；
Wherein, claim to weigh 5.0~5.1g sample with electronic balance when sample, be placed on spare in 200ml beaker；When wetting, with a little
Distilled water soaks sample；When dissipating sample, 10ml hydrochloric acid solution is added, gently shakes beaker, sample is made to scatter in acid solution；Molten sample
When, beaker is placed on hot plate, watch glass is covered, heating causes test solution slightly boiled, firepower is turned down, and test solution is made to keep slightly boiled
During which 15min gently shakes beaker 2-3 times；When fixed molten, 100 ml of constant volume, filtering takes 25 ml test solutions in 300ml conical flask
It is spare；Sampling, is added plus screening agent shakes up, and then carries out pH adjusting, and pH is dripped after the completion of adjusting using EDTA standard solution
It is fixed.
Further, in step 6), NH is selected4F solution is that screening agent is added in sample liquid, is shaken up.
Further, in test plus 100ml distilled water, solid with hexamethylenetetramine when adjusting test solution pH in step 7)
Body is added directly into test solution, is shaken to being completely dissolved, additional amount reaches 5.5-6.0 with test solution pH value.
Further, in step 8), xylenol orange is as indicator.
Further, in step 7), ammonium fluoride is pure, the concentration 500g/L of chemistry, and additional amount is 10~15ml.
Further, in step 8), the concentration of xylenol orange is 2g/L.
Further, in step 7), test solution pH is adjusted, six methines four are added between 5.5~6.0 in strict control pH
Amine amount lower bound is 8 g of 2g-.
Compared with prior art, the present invention one of at least has the advantages that:
1) good in economic efficiency.Detection device and reagent Meteorological are few, assay balance, electric hot plate Deng Doushi general enterprises laboratory
The common test facility of outfit, does not have to newly-increased investment, and application of the invention can reduce Atomic absorption equipment purchase expense for enterprise
With about 500,000 yuan, or can save third party inspection expense: by 100~150 yuan/, production period is 7 days or so, and centre control needs
It wants one class once, analysis times about 21 times, then needs to pay 2100~3150 yuan of Expenses of laboratory examination.
2) analysis result is quoted high-efficient.Zn content result of the present invention quotes the time and needs about 30min altogether, if enterprise is not
Have analysis condition, send third party inspection outside, as a result quote the time most needs 1 week fastly.
3) it is conducive to enterprise and controls cost, improves the performance of enterprises.Higher (the zinc oxide market purchasing price in zinc market price of raw material
About 20000 yuan/ton), if the case where production process cannot grasp Zn content in product in time, adding zinc raw material be will cause into
This increase, profit are reduced, or generate rejected product, are caused businessman to return goods, are caused the loss that enterprise is bigger.
4) the method does not need any instrument of enterprise's increase, equipment in cost, and the conventional instrument of analysis room can expire
Foot analysis needs, the big reduction of analysis cost；Secondly result quotes the time and only needs 30min, is conducive to timely Instructing manufacture and controls.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment:
The present invention adjusts test solution in the presence of Fe Al Mg plasma, by using screening agent sheltering the interference ions simultaneously
PH improves the selectivity of EDTA dropping liquid, to accurately measure in phosphorus ammonium and series based on phosphorus ammonium Zn in trace element fertilizer
Content.Specifically used EDTA titration is measured by following steps:
1, the preparation of test specimen:
1.1 test specimens: the sample fetched on production line is uniformly mixed (particle or powdery), about 50g is weighed, is crushed with Chinese medicine
Machine is crushed to all by 0.5mm standard screen, spare in clean vial；
1.2 blank samples: same materials production, identical production technology but the fertilizer for being not added with zinc are prepared by above-mentioned 1.1 method
It is good, it is spare.
2, the preparation (preparation) of reagent:
2.1 hydrochloric acid: analysis pure (1+1) 2.2 6 methylene tetramine: analysis is pure；
2.3 xylenol orange indicator: 2g/L (aqueous solution)；
2.4 ammonium fluorides: 500 g/L(aqueous solutions)；
2.5 EDTA standard titration solutions: C(EDTA)=0.05mol/L.
3. equipment prepares:
3.1 assay balance；
3.2 electric hot plate；
3.3 glass measuring device.
4, specific steps are as follows:
4.1 weighed using assay balance the test specimen 5.0g (being accurate to 0.0002 g) prepared in 1.1 put 200ml beaker or
It is spare in beaker in tall form.Sample is soaked with a little distilled water；
4.2 soak sample with a little distilled water；
4.3 are added 10ml hydrochloric acid (1+1) solution, gently shake beaker, sample is made to scatter in acid solution；When molten sample, beaker is put
It sets on hot plate, covers watch glass, heating causes test solution slightly boiled, firepower is turned down, so that test solution is kept slightly boiled 15min, during which gently
It shakes beaker 2-3 times；
4.4 remove, and are cooled to room temperature rear constant volume in 100.0ml volumetric flask, shake up, filtering.This process purpose is sample
The zinc of middle various forms converts the zinc of not free state；
4.5 sample filtrate 25.0ml, are placed in 250ml conical flask, add distilled water 100ml.Add distilled water purpose first is that reduce
Test solution acidity, while expanding test solution amount, reduce titration process error；
Add 15ml ammonium fluoride solution (2.4) in 4.6 test solutions, shakes up (the Al in ammonium fluoride masking test solution3+), weigh 2.0-8.0 g
Six methylene tetramine solids (2.2) are added in test solution, are sufficiently shaken up, are tested with accurate pH test paper, experimental liquid pH value is 5.5~6.0
Between, add 2 drop xylenol orange indicator (2.3) (when pH value is 5.5~6.0, Ca2+ Mg2+It will not be with xylenol orange shape
At colored complex)；
4.7 are become the moment of glassy yellow from aubergine with the test solution in EDTA standard titration solution (2.5) titration step 7, solution
As terminal writes down the EDTA volume number of consumption；
4.8 do blank, analytical procedure and sample one to blank terminal is that aubergine becomes orange red with the sample without zinc simultaneously
Color writes down blank test solution consumption EDTA volume number.
The calculating (mass fraction of Zn is indicated with the mass fraction of ZnO) of 5 Zn contents.
The volume of the EDTA titrand consumed in 4.7,4.8 and concentration are substituted into following formula and carry out operation.
Wherein:Are as follows: the mass fraction of zinc in sample;
C are as follows: the concentration of EDTA titrating solution；
V1 are as follows: consumption EDTA volume；
M are as follows: example weight；
The Zn content of Zn content blank sample in sample is modified: W(ZnO) = W(ZnO) (sample)- W(ZnO) (blank)。
Specific embodiment is as follows:
Below with reference to specific embodiment, the present invention is further illustrated, but embodiment is not to technical solution of the present invention
Restriction.All transformation made based on the present invention are within the scope of protection of the invention.
Specific embodiment 1
It weighs the sample of Diammonium phosphate (DAP) containing zinc 5.9275g (being accurate to 0.0002 g) to put in the beaker or beaker in tall form of 200ml, use
Little water soak sample, add 10.0ml hydrochloric acid (2.1), cover watch glass, be heated on electric hot plate it is slightly boiled, keep 15min, take
Under, rear constant volume is cooled to room temperature in 100.0ml volumetric flask, is shaken up, and is filtered.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 2.0 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=6.0ml.Blank, analytical procedure and sample one are done to blank is whole with the sample 4.7246g without zinc simultaneously
Point is that aubergine becomes orange red, writes down blank test solution consumption EDTA volume V0=0.90ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample are as follows: 1.34% (Specimen Determination value-blank value=1.65%-0.31%).
Product quality inspection research institute atom absorbing method is sent to detect in the sample simultaneously, Zn content are as follows: 1.34%.
Specific embodiment 2
It weighs the sample of Diammonium phosphate (DAP) containing zinc 5.0445g (being accurate to 0.0002 g) to put in the beaker or beaker in tall form of 200ml, use
Little water soak sample, add 10.0ml hydrochloric acid (2.1), cover watch glass, be heated on electric hot plate it is slightly boiled, keep 15min, take
Under, rear constant volume is cooled to room temperature in 100.0ml volumetric flask, is shaken up, and is filtered.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 2.0 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=5.72ml.Blank, analytical procedure and sample one are done to blank is whole with the sample 4.7246g without zinc simultaneously
Point is that aubergine becomes orange red, writes down blank test solution consumption EDTA volume V0=0.90ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample are as follows: 1.53%(Specimen Determination value-blank value=1.84%-0.31%).
Product quality inspection research institute atom absorbing method is sent to detect in the sample simultaneously, Zn content are as follows: 1.53%.
Specific embodiment 3
Weigh beaker or beaker in tall form that the sample of sulphur-containing diammonium phosphate containing zinc 5.0203g (being accurate to 0.0002 g) puts 200ml
In, sample is soaked with little water, adds 10.0ml hydrochloric acid (2.1), covers watch glass, slightly boiled, holding is heated on electric hot plate
15min is removed, and is cooled to room temperature rear constant volume in 100.0ml volumetric flask, is shaken up, filtering.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 2.5 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=2.40ml.Blank, analytical procedure and sample one are done to blank is whole with the sample 5.0061 without zinc simultaneously
Point is that aubergine becomes orange red, writes down blank test solution consumption EDTA volume V0=0.0ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample are as follows: 0.78%(Specimen Determination value-blank value=0.78%-0.00%).
Product quality inspection research institute atom absorbing method is sent to detect in the sample simultaneously, Zn content are as follows: 0.75%.
Specific embodiment 4
Weigh beaker or beaker in tall form that the sample of sulphur-containing diammonium phosphate containing zinc 5.0275g (being accurate to 0.0002 g) puts 200ml
In, sample is soaked with little water, adds 10.0ml hydrochloric acid (2.1), covers watch glass, slightly boiled, holding is heated on electric hot plate
15min is removed, and is cooled to room temperature rear constant volume in 100.0ml volumetric flask, is shaken up, filtering.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 2.5 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=1.75ml.Blank, analytical procedure and sample one are done to blank is whole with the sample 5.0061g without zinc simultaneously
Point is that aubergine becomes orange red, writes down blank test solution consumption EDTA volume V0=0.00ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample are as follows: 0.57%(Specimen Determination value-blank value=0.57%-0.00%).
Product quality inspection research institute atom absorbing method is sent to detect in the sample simultaneously, Zn content are as follows: 0.56%.
Specific embodiment 5
Weigh beaker or beaker in tall form that the sample of sulphur-containing diammonium phosphate containing zinc 4.9765g (being accurate to 0.0002 g) puts 200ml
In, sample is soaked with little water, adds 10.0ml hydrochloric acid (2.1), covers watch glass, slightly boiled, holding is heated on electric hot plate
15min is removed, and is cooled to room temperature rear constant volume in 100.0ml volumetric flask, is shaken up, filtering.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 5.0 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=5.5ml.Blank, analytical procedure and sample one are done to blank terminal with the sample 5.0061 without zinc simultaneously
Become orange red for aubergine, writes down blank test solution consumption EDTA volume V0=0.00ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample are as follows: 1.80%(Specimen Determination value-blank value=1.80%-0.00%).
Product quality inspection research institute atom absorbing method is sent to detect in the sample simultaneously, Zn content are as follows: 1.79%.
Specific embodiment 6
The 5.0249g containing zinc Diammonium phosphate (DAP) containing S sample (being accurate to 0.0002 g) is weighed to put in the beaker or beaker in tall form of 200ml,
With little water soak sample, add 10.0ml hydrochloric acid (2.1), cover watch glass, be heated on electric hot plate it is slightly boiled, keep 15min, take
Under, rear constant volume is cooled to room temperature in 100.0ml volumetric flask, is shaken up, and is filtered.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 8.0 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=4.15ml.Blank, analytical procedure and sample one are done to blank is whole with the sample 5.0061g without zinc simultaneously
Point is that aubergine becomes orange red, writes down blank test solution consumption EDTA volume V0=0.00ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample are as follows: 1.34%(Specimen Determination value-blank value=1.34%-0.00%).
Product quality inspection research institute atom absorbing method is sent to detect in the sample simultaneously, Zn content are as follows: 1.36%.
Specific embodiment 7
It weighs compound fertilizer's containing zinc sample 5.5285g (being accurate to 0.0002 g) to put in the beaker or beaker in tall form of 200ml, with less
Xu Shui soak sample, add 10.0ml hydrochloric acid (2.1), cover watch glass, be heated on electric hot plate it is slightly boiled, keep 15min, remove,
Rear constant volume is cooled to room temperature in 100.0ml volumetric flask, is shaken up, is filtered.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 2.5 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=0.95ml.Blank, analytical procedure and sample one are done to blank is whole with the sample 5.0037g without zinc simultaneously
Point is that aubergine becomes orange red, writes down blank test solution consumption EDTA volume V0=0.21ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample are as follows: 0.21%(Specimen Determination value-blank value=0.28%-0.07%).
Product quality inspection research institute atom absorbing method is sent to detect in the sample simultaneously, Zn content are as follows: 0.21%.
Specific embodiment 8
It weighs (being accurate to 0.0002 g) containing zinc sample containing ammonium sulphate phosphate 5.0032g to put in the beaker or beaker in tall form of 200ml, use
Little water soak sample, add 10.0ml hydrochloric acid (2.1), cover watch glass, be heated on electric hot plate it is slightly boiled, keep 15min, take
Under, rear constant volume is cooled to room temperature in 100.0ml volumetric flask, is shaken up, and is filtered.
Sample filtrate 25.0ml is pipetted, is placed in 250ml conical flask, distilled water 100ml is added, adds 15ml ammonium fluoride solution
(2.4), it shakes up, weighs 2.5 g, six methylene tetramine (2.2) and be added in test solution, sufficiently shake up, add 2 drop xylenol orange indicator
(2.3), it is titrated with EDTA(C=0.04993mol/L) standard titration solution, solution becomes glassy yellow from aubergine, writes down consumption
EDTA volume V1=3.05ml.Blank, analytical procedure and sample one are done to blank is whole with the sample 5.0061g without zinc simultaneously
Point is that aubergine becomes orange red, writes down blank test solution consumption EDTA volume V0=0.0ml.
The volume for the EDTA titrand that sample and blank sample consume and concentration are substituted into formula progress operation to obtain
Zn content in sample (in terms of ZnO) are as follows: 0.99%(Specimen Determination value-blank value=0.99%-0.00%).
Meanwhile sending product quality inspection research institute atom absorbing method to detect in the sample, Zn content are as follows: 1.0%.
Can be derived that: Zn, added in fertilizer, can reinforce the function of chemical fertilizer as a kind of micro content, improve fertilizer efficiency, at present
Most fertilizer enterprises add Zn element in chemical fertilizer, and additive amount monitors the Zn of low content, generally generally between 0.2-1.0%
Using mono- ten thousand RMB of atomic absorption instrument price about 30-50 of atomic absorption method, general small business cannot be undertaken,
Therefore, be not equipped with the enterprise of Atomic absorption, when producing fertilizer containing Zn, only one sample be sent to qualified testing agency into
Row detection, learns, the testing cost of testing agency is 100-150 member/item, and the method exists according to my related data of company's inspection
Enterprise is not needed in cost increases any instrument, equipment, the conventional instrument of analysis room can meet analysis needs, therefore,
Very big expense can be saved on analysis cost for enterprise.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations will fall in this Shen
It please be within disclosed scope and spirit.It more specifically, can be to master in the scope of the claims disclosed in the present application
The building block and/or layout for inscribing composite configuration carry out a variety of variations and modifications.In addition to what is carried out to building block and/or layout
Outside modification and improvement, to those skilled in the art, other purposes also be will be apparent.
Claims (7)
1. the rapid assay methods of Zn content in a kind of fertilizer, it is characterised in that: measured with EDTA titration by following steps:
1) claim sample；
2) it soaks；
3) sample is dissipated；
4) molten sample；
5) fixed molten；
6) add screening agent；
7) pH is adjusted；
8) it titrates；
Wherein, claim to weigh 5.0~5.1g sample with electronic balance when sample, be placed on spare in 200ml beaker；When wetting, with a little
Distilled water soaks sample；When dissipating sample, 10ml hydrochloric acid solution is added, gently shakes beaker, sample is made to scatter in acid solution；Molten sample
When, beaker is placed on hot plate, watch glass is covered, heating causes test solution slightly boiled, firepower is turned down, and test solution is made to keep slightly boiled
During which 15min gently shakes beaker 2-3 times；When fixed molten, constant volume 100ml, filtering takes 25ml test solution standby in 300ml conical flask
With；Sampling is added screening agent and shakes up, and then carries out pH adjusting, and pH is titrated after the completion of adjusting using EDTA standard solution.
2. the rapid assay methods of Zn content in a kind of fertilizer according to claim 1, it is characterised in that: in step 6),
Select NH4F solution is that screening agent is added in sample liquid, is shaken up.
3. the rapid assay methods of Zn content in a kind of fertilizer according to claim 1, it is characterised in that: in step 7),
When adjusting test solution pH, in test plus 100ml distilled water, it is added directly into test solution, is shaken to complete with hexamethylenetetramine solid
Fully dissolved, additional amount reach 5.5-6.0 with test solution pH value.
4. the rapid assay methods of Zn content in a kind of fertilizer according to claim 1, it is characterised in that: in step 8),
Xylenol orange is as indicator.
5. the rapid assay methods of Zn content in a kind of fertilizer according to claim 1, it is characterised in that: in step 7),
Ammonium fluoride is pure, the concentration 500g/L of chemistry, and additional amount is 10~15ml.
6. the rapid assay methods of Zn content in a kind of fertilizer according to claim 1, it is characterised in that: in step 8),
The concentration of xylenol orange is 2g/L.
7. the rapid assay methods of Zn content in a kind of fertilizer according to claim 1, it is characterised in that: in step 7),
Test solution pH is adjusted, for strict control pH between 5.5~6.0, addition hexamethylenetetramine amount lower bound is 2g -8g.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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