CN113109332A - Rapid detection reagent and method for potassium iodate in salt - Google Patents
Rapid detection reagent and method for potassium iodate in salt Download PDFInfo
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- CN113109332A CN113109332A CN202110398160.6A CN202110398160A CN113109332A CN 113109332 A CN113109332 A CN 113109332A CN 202110398160 A CN202110398160 A CN 202110398160A CN 113109332 A CN113109332 A CN 113109332A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 61
- JLKDVMWYMMLWTI-UHFFFAOYSA-M potassium iodate Chemical compound [K+].[O-]I(=O)=O JLKDVMWYMMLWTI-UHFFFAOYSA-M 0.000 title claims abstract description 46
- 239000001230 potassium iodate Substances 0.000 title claims abstract description 45
- 235000006666 potassium iodate Nutrition 0.000 title claims abstract description 45
- 229940093930 potassium iodate Drugs 0.000 title claims abstract description 45
- 239000003153 chemical reaction reagent Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 title abstract description 20
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims abstract description 61
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229920002472 Starch Polymers 0.000 claims abstract description 18
- 235000019698 starch Nutrition 0.000 claims abstract description 18
- 239000008107 starch Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910001868 water Inorganic materials 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 15
- FUSNOPLQVRUIIM-UHFFFAOYSA-N 4-amino-2-(4,4-dimethyl-2-oxoimidazolidin-1-yl)-n-[3-(trifluoromethyl)phenyl]pyrimidine-5-carboxamide Chemical compound O=C1NC(C)(C)CN1C(N=C1N)=NC=C1C(=O)NC1=CC=CC(C(F)(F)F)=C1 FUSNOPLQVRUIIM-UHFFFAOYSA-N 0.000 claims abstract description 14
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229960001484 edetic acid Drugs 0.000 claims abstract description 14
- 239000012493 hydrazine sulfate Substances 0.000 claims abstract description 14
- 229910000377 hydrazine sulfate Inorganic materials 0.000 claims abstract description 14
- 235000002639 sodium chloride Nutrition 0.000 claims description 78
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 35
- 239000000243 solution Substances 0.000 claims description 29
- 239000011780 sodium chloride Substances 0.000 claims description 25
- 239000012266 salt solution Substances 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 2
- 239000011541 reaction mixture Substances 0.000 claims 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 abstract description 19
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 13
- 239000011630 iodine Substances 0.000 description 13
- 229910052740 iodine Inorganic materials 0.000 description 12
- 206010067997 Iodine deficiency Diseases 0.000 description 8
- 235000006479 iodine deficiency Nutrition 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 230000002378 acidificating effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 4
- 235000019345 sodium thiosulphate Nutrition 0.000 description 4
- -1 iodide ions Chemical class 0.000 description 3
- 239000011785 micronutrient Substances 0.000 description 3
- 235000013369 micronutrients Nutrition 0.000 description 3
- 239000012086 standard solution Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 208000002720 Malnutrition Diseases 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 235000000824 malnutrition Nutrition 0.000 description 2
- 230000001071 malnutrition Effects 0.000 description 2
- 208000015380 nutritional deficiency disease Diseases 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- XUIIKFGFIJCVMT-GFCCVEGCSA-N D-thyroxine Chemical compound IC1=CC(C[C@@H](N)C(O)=O)=CC(I)=C1OC1=CC(I)=C(O)C(I)=C1 XUIIKFGFIJCVMT-GFCCVEGCSA-N 0.000 description 1
- 206010011878 Deafness Diseases 0.000 description 1
- 206010012559 Developmental delay Diseases 0.000 description 1
- 206010018498 Goitre Diseases 0.000 description 1
- AUYYCJSJGJYCDS-LBPRGKRZSA-N Thyrolar Chemical class IC1=CC(C[C@H](N)C(O)=O)=CC(I)=C1OC1=CC=C(O)C(I)=C1 AUYYCJSJGJYCDS-LBPRGKRZSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000037213 diet Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000037406 food intake Effects 0.000 description 1
- 238000012812 general test Methods 0.000 description 1
- 201000003872 goiter Diseases 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000005556 hormone Substances 0.000 description 1
- 229940088597 hormone Drugs 0.000 description 1
- ICIWUVCWSCSTAQ-UHFFFAOYSA-M iodate Chemical compound [O-]I(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-M 0.000 description 1
- 230000026045 iodination Effects 0.000 description 1
- 238000006192 iodination reaction Methods 0.000 description 1
- 150000002496 iodine Chemical class 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- AFSVSXMRDKPOEW-UHFFFAOYSA-N iodine monoxide Inorganic materials I[O] AFSVSXMRDKPOEW-UHFFFAOYSA-N 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036630 mental development Effects 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 235000020802 micronutrient deficiency Nutrition 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000036417 physical growth Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000005495 thyroid hormone Substances 0.000 description 1
- 229940036555 thyroid hormone Drugs 0.000 description 1
- 229940034208 thyroxine Drugs 0.000 description 1
- XUIIKFGFIJCVMT-UHFFFAOYSA-N thyroxine-binding globulin Natural products IC1=CC(CC([NH3+])C([O-])=O)=CC(I)=C1OC1=CC(I)=C(O)C(I)=C1 XUIIKFGFIJCVMT-UHFFFAOYSA-N 0.000 description 1
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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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth 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 belongs to the technical field of salt detection, and particularly relates to a method for rapidly detecting potassium iodate in salt. The reagent adopted in the method comprises the following raw materials in parts by weight: 10-50 parts of citric acid, 5-10 parts of potassium iodide, 20-30 parts of hydrazine sulfate, 20-30 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid. The method of the invention comprises the following steps: adding water into salt to dissolve, adding detection reagent, observing the color change condition of the solution, and judging whether the salt contains potassium iodate according to the color change condition of the solution. The invention has the beneficial effects that: (1) by adopting the method, whether the potassium iodate exists in the salt can be conveniently and quickly judged, and the judgment result is high in accuracy; (2) the detection reagent provided by the invention is low in cost and easy to popularize and apply in large scale. (3) The method of the invention can solve the problem of interference of nitrite in the salt, especially in the crude salt.
Description
Technical Field
The invention belongs to the technical field of salt detection, and particularly relates to a method for rapidly detecting potassium iodate in salt.
Background
The severity and consequences of global malnutrition have been increasingly recognized over the past decade. More than one third of the world's population is severely deficient in micronutrients, particularly iodine. In less developed countries, these defects can have serious consequences for public health, particularly for women and children.
Iodine deficiency in soil and water and food can lead to iodine deficiency. Inadequate iodine intake in the diet can lead to cretinism. Deaf-mute, goiter, leading to developmental delay, malformations, and infant and neonatal mortality. These diseases are collectively referred to as iodine deficiency (IDD), which is easily prevented by ingestion of sufficient iodine. The average daily requirement for iodine was 150 micrograms.
Iodine has particular biological significance since it is a component of the thyroid hormone thyroxine. Iodine plays a role in controlling the metabolism of the body. These hormones are also essential for normal physical growth and mental development in children.
Iodine is the most abundant in nature in the ocean, it is present in the original development stage of the earth, but a large amount of water is leached from surface soil by glaciers, snow and rain, and is washed into the sea by wind and seawater. Thus, plateau populations tend to be more iodine deficient, and the incidence of iodine deficiency is generally higher.
Fortification of commonly used foods is an important component of the strategy for the prevention and treatment of micronutrient malnutrition. Salt is an ideal carrier for micronutrients, and in particular in developing countries, common salt has proven to be an ideal carrier against micronutrient deficiencies, because of its low price, its consumption is generally uniform throughout the population class, independent of socio-economic status, and the possibility of excessive intake is low. In developed countries, iodine salts or iodized salts are already present, while in north america and most european countries, the iodine deficiency problem has been substantially eliminated. However, since the severity and severity of iodine deficiency has not been widely recognized until recently, most affected countries have only begun to take steps to popularize iodization of common salt in the last few years. Iodination programs have been enacted in many developing countries and they have begun to dramatically reduce iodine deficiency.
The salt can be potassium iodide (KI) or iodate（KIO3) The former is stable in refined dry salt and the latter shows better stability in poor salt with poor package.
The method for measuring the iodide ions in the potassium iodate salt is generally carried out according to a direct titration method in GB/T13025.7-1999 determination of iodide ions in the general test method of salt manufacturing industry, wherein in the measuring process of the method, a potassium iodate standard solution is prepared, then a sodium thiosulfate standard solution is calibrated, the titer of the sodium thiosulfate standard solution on the iodide ions is calculated, and then the sodium thiosulfate standard use solution is used for titrating the salt. Because the concentration of the titrated sodium thiosulfate is about 0.002 mol/L and is low, the titration needs to be carried out again before each batch of samples are measured, and the operation process is time-consuming. The method can only be carried out in a laboratory, and cannot meet the aim of rapid field detection.
At present, the principle for rapidly detecting potassium iodate in salt is that under an acidic condition, potassium iodate reacts with potassium iodide to quantitatively separate out iodine, the iodine and starch generate colors, the color depth is in direct proportion to the iodine content, and the iodine content can be determined by comparing the colors with a standard colorimetric card. However, this method has a fatal drawback that nitrite contained in common salt, even in a very small amount, causes a false positive result. GB 15198-. Nitrite reacts with iodide in an acidic environment, even in trace amounts, to form nitric oxide, iodine and water, and the reaction equation is as follows:
2NO2 - + 2I- + 4H+ = 2NO + I2 +2H2O
the nitrogen monoxide produced in the reaction can be oxidized into nitrite by oxygen in the air, the nitrite further reacts with iodide to generate more iodine and nitrogen monoxide, the reaction can be circulated indefinitely, and false positive results are caused. Therefore, only elimination of nitrite can avoid the generation of false positive results.
Therefore, the present invention is needed to improve the above-mentioned drawbacks and to provide a reagent and a method for rapidly detecting potassium iodate in common salt, which can remove the nitrite in common salt to avoid the occurrence of false positive result.
Disclosure of Invention
In order to solve the technical problems, the invention avoids the occurrence of false positive results by removing nitrite in the salt, thereby providing a rapid detection reagent for potassium iodate in the salt, which has high accuracy, low detection cost and short detection time;
the invention provides a rapid detection reagent for potassium iodate in salt, which comprises the following raw materials in parts by weight:
the quick detection reagent for potassium iodate in salt comprises the following raw materials in parts by weight:
10-50 parts of citric acid, 5-10 parts of potassium iodide, 20-30 parts of hydrazine sulfate, 20-30 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid.
The reagent comprises the following raw materials in parts by weight:
10-40 parts of citric acid, 5-8 parts of potassium iodide, 22-28 parts of hydrazine sulfate, 22-28 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid.
The reagent comprises the following raw materials in parts by weight:
25 parts of citric acid, 7 parts of potassium iodide, 25 parts of hydrazine sulfate, 25 parts of starch and 3 parts of ethylenediamine tetraacetic acid.
Preferably, the method for rapidly detecting potassium iodate in salt comprises the following steps:
s1: taking salt, pouring into a test tube, and adding water to dissolve the salt to obtain a salt solution;
s2: preparing a reagent:
taking the following raw materials in parts by weight: 10-50 parts of citric acid, 5-10 parts of potassium iodide, 20-30 parts of hydrazine sulfate, 20-30 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid, and uniformly mixing;
s3: adding the reagent in the S2 into the salt solution of the S1, shaking up, and observing the color change condition of the solution;
s4: observing the mixed solution in the S3, and if the solution is bluish purple, judging that the salt contains potassium iodate; if the color of the solution is not changed, the salt is judged to have no potassium iodate.
Preferably, S1: taking salt, adding water to dissolve the salt, wherein the mass volume ratio of the salt to the water is 1g/3 mL.
The method for rapidly detecting the potassium iodate in the salt comprises the following steps:
s1: taking salt, adding water to dissolve the salt, wherein the mass volume ratio of the salt to the water is 1g/3 mL;
s2: preparing a reagent:
taking the following raw materials in parts by weight: 10-50 parts of citric acid, 5-10 parts of potassium iodide, 20-30 parts of hydrazine sulfate, 20-30 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid, and uniformly mixing;
s3: adding the reagent in the S2 into the salt solution of the S1, shaking up, and observing the color change condition of the solution;
s4: observing the mixed solution in the S3, and if the solution is bluish purple, judging that the salt contains potassium iodate; if the color of the solution is not changed, the salt is judged to have no potassium iodate.
The invention has the beneficial effects that:
(1) by adopting the method, whether the potassium iodate exists in the salt can be conveniently and quickly judged, and the judgment result is high in accuracy;
(2) the detection reagent has low cost and is easy to popularize and apply in large scale;
(3) the method of the invention can solve the interference problem of nitrite in salt, especially in crude salt.
Drawings
FIG. 1 is a photograph of starch discoloration caused by reaction of nitrite with potassium iodide under acidic conditions;
FIG. 2 is a photograph of the discoloration of starch by the reaction of potassium iodate with potassium iodide under acidic conditions.
Detailed Description
The present invention will now be further described with reference to specific embodiments in order to enable those skilled in the art to better understand the present invention.
Example 1
The quick detection reagent for potassium iodate in salt is prepared by the following steps: taking the following raw materials in parts by weight:
25 parts of citric acid, 7 parts of potassium iodide, 25 parts of hydrazine sulfate, 25 parts of starch and 3 parts of ethylene diamine tetraacetic acid, and uniformly mixing to obtain the detection reagent.
Example 2
The quick detection reagent for potassium iodate in salt is prepared by the following steps: taking the following raw materials in parts by weight:
15 parts of citric acid, 10 parts of potassium iodide, 20 parts of hydrazine sulfate, 20 parts of starch and 1 part of ethylene diamine tetraacetic acid, and uniformly mixing to obtain the detection reagent.
Example 3
The quick detection reagent for potassium iodate in salt is prepared by the following steps: taking the following raw materials in parts by weight:
50 parts of citric acid, 5 parts of potassium iodide, 30 parts of hydrazine sulfate, 30 parts of starch and 5 parts of ethylene diamine tetraacetic acid, and uniformly mixing to obtain the detection reagent.
Example 4
The method for rapidly detecting the potassium iodate in the salt comprises the following steps:
s1: 1g of salt is taken and poured into a test tube, and 3mL of water is added to dissolve the salt to obtain a sample 1 to be detected; then preparing the same samples 2 and 3 according to the method;
s2: 0.1g of the reagents prepared in the examples 1, 2 and 3 are respectively added into three salt sample solutions of S1, shaken up and the color change of the solutions is observed;
s3: observing the mixed solution in S3, and if the solution is bluish purple, indicating that the salt contains potassium iodate; if the color of the solution is not changed, the salt is said to have no potassium iodate.
Example 5
Influence of nitrite on the assay results
In the potassium iodide solution, nitrite with different concentrations was added, then hydrochloric acid with 0.1N concentration was used to adjust the acidity of the solution, and then the reaction of trace amount of nitrite with iodide in the solution was observed, and the results are shown in table 1.
TABLE 1 influence of nitrite on the results
| NO2 -（M） | I-（M） | H+（M） | Color change condition |
| 4.1×10-6 | 1.1×10-2 | 0 | Discolouring after 1hr |
| 8.5×10-6 | 1.1×10-2 | 0 | Discolouring after 1hr |
| 0 | 1.1×10-2 | 0.6 | Color change in about 4 minutes |
| 4.1×10-6 | 1.1×10-2 | 0.6 | Discolouration after 1 second |
| 8.5×10-6 | 1.1×10-2 | 0.6 | Discolouration after 1 second |
As can be seen from table 1, under acidic conditions, nitrite also reacts rapidly with iodide, thereby discoloring starch, indicating that the presence of trace amounts of nitrite inevitably affects the detection of potassium iodide under acidic conditions.
Example 6
Determination of Potassium iodate
The specific method comprises the following steps:
s1: three portions of analytically pure sodium chloride solid are taken as base materials, 30mg/kg of potassium iodate is added into the first portion, and the first portion is marked as a sample A; the second portion was added with 5mg/kg of sodium nitrite and was designated sample B; the third portion was designated as C as a control.
S2: respectively taking A, B, C samples of 1g, dissolving with 3mL of water to obtain a salt solution to be detected;
s3: adding the reagents prepared in example 1 into the common salt solution to be detected respectively, observing the color change condition of the solution, wherein the mass ratio of the added amount of the reagents to the common salt is 1: 10; the results of the color change of the solution are shown in Table 2.
TABLE 2 color change of saline solution for different treatments
| Sample (I) | Treatment of | Color change of solution |
| Sample A | Potassium iodate and sodium chloride | Blue color |
| Sample B | Nitrite + sodium chloride | No color change |
| Sample C | Sodium chloride | No color change |
As can be seen from Table 2, in the combined potassium iodate and sodium chloride solution, the color of the solution appeared blue; in the solution of the nitrite and sodium chloride combination, the solution has no color change; in the sodium chloride solution in sample C, the solution did not change color. This shows that the method of the present invention completely eliminates the interference of nitrite during the determination of potassium iodate.
Claims (7)
1. The reagent for rapidly detecting potassium iodate in table salt is characterized by comprising the following raw materials in parts by weight:
10-50 parts of citric acid, 5-10 parts of potassium iodide, 20-30 parts of hydrazine sulfate, 20-30 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid.
2. The reagent for rapidly detecting potassium iodate in common salt as claimed in claim 1, wherein the reagent comprises the following raw materials by weight:
10-40 parts of citric acid, 5-8 parts of potassium iodide, 22-28 parts of hydrazine sulfate, 22-28 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid.
3. The reagent for rapidly detecting potassium iodate in common salt as claimed in claim 1, wherein the reagent comprises the following raw materials by weight:
25 parts of citric acid, 7 parts of potassium iodide, 25 parts of hydrazine sulfate, 25 parts of starch and 3 parts of ethylenediamine tetraacetic acid.
4. The method for rapidly detecting potassium iodate in common salt as claimed in claim 1, comprising the steps of:
s1: taking salt, pouring into a test tube, and adding water to dissolve the salt to obtain a salt solution;
s2: preparing a reagent:
taking the following raw materials in parts by weight: 10-50 parts of citric acid, 5-10 parts of potassium iodide, 20-30 parts of hydrazine sulfate, 20-30 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid, and uniformly mixing;
s3: adding the reagent in the S2 into the salt solution of the S1, shaking up, and observing the color change condition of the solution;
s4: observing the mixed solution in the S3, and if the solution is bluish purple, judging that the salt contains potassium iodate; if the color of the solution is not changed, the salt is judged to have no potassium iodate.
5. The method for rapidly detecting potassium iodate in common salt as claimed in claim 1, wherein the reaction mixture is a mixture of potassium iodate and sodium chloride,
s1: taking salt, adding water to dissolve the salt, wherein the mass volume ratio of the salt to the water is 1g/3 mL.
6. The method for rapidly detecting potassium iodate in common salt as claimed in claim 1, wherein the reaction mixture is a mixture of potassium iodate and sodium chloride,
in S3, the mass ratio of the reagent in S2 to the common salt in S1 is 1: 10.
7. the method for rapidly detecting potassium iodate in common salt as claimed in claim 1, comprising the steps of:
s1: taking salt, adding water to dissolve the salt, wherein the mass volume ratio of the salt to the water is 1g/3 mL;
s2: preparing a reagent:
taking the following raw materials in parts by weight: 10-50 parts of citric acid, 5-10 parts of potassium iodide, 20-30 parts of hydrazine sulfate, 20-30 parts of starch and 1-5 parts of ethylene diamine tetraacetic acid, and uniformly mixing;
s3: adding the reagent in the S2 into the salt solution of the S1, shaking up, and observing the color change condition of the solution; the mass ratio of the reagent in the S2 to the common salt in the S1 is 1: 10;
s4: observing the mixed solution in the S3, and if the solution is bluish purple, judging that the salt contains potassium iodate; if the color of the solution is not changed, the salt is judged to have no potassium iodate.
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