How does ICP detect sulfuric acid? Urgent help

You're talking about ICP-AES, which is commonly used to determine the content of metal elements.

Inductively coupled plasma-emission spectroscopy tests all the elements included in the product. Mainly used for the analysis of environmental substances, the ICP report is a document certifying environmental safety in ISO14001.

Contains the following:

1.Pretreatment.

2.Assay method.

3.The name of the person who made the measurement, the name of the person responsible for the measurement, and the name of the analysis organization.

4.Date of determination.

5.Measurement results.

6.Determination flow chart.

ICP-OES is one of the most widely used high-sensitivity simple analytical instruments in recent years, very suitable for the simultaneous detection of multiple elements, with incomparable advantages of other analytical instruments, can perform the analysis of more than 70 elements, each element has high sensitivity, its detection limit is usually ppb (ng ml), the linear range of the standard curve is more than 6 orders of magnitude, and the interference is very small.

You can weigh about one gram of sulfuric acid solution with a drop bottle, then add 60ml of water, titrate with methyl red-methylene blue as an indicator, and the solution changes from burgundy to green to indicate the end point. Record the NAOH volume.

Calculation formula: the percentage of sulfuric acid is equal to the concentration of sodium hydroxide multiplied by the volume of sodium hydroxide consumed, then multiplied by the final division by the weight multiplied by 100.

NaOH standard solution, phenolphthalein indicator 5 g L, 250 ml triangular flask, 50 ml basic burette, analytical balance are required.

Weigh the gram (accurate to gram) sample in a 250ml triangular flask, add 100ml of water to dissolve, add 2-4 drops of phenolphthalein indicator, and titrate with NaOH standard solution until light red.

Calculation: sulfuric acid content x = c * v *

C: NaOH standard solution concentration.

V: Volume of NaOH standard solution for titration.

m: Sample mass.

If you don't understand something, you can bring it up.

Take 5ml, add water to 100ml, add 2 drops of phenolphthalein, and titrate with sodium hydroxide.

Fantai detection replied:

IC detection of sulfate.

50ppm or more.

Sulfate ion test.

1 Reaction principle: Ba2+ +SO42 BaSO4 2 Reagents used: dilute hydrochloric acid and BaCl2 solution.

3 Dropwise addition sequence: add dilute hydrochloric acid first (to rule out the interference of carbonate and silver ions), and then add BaCl2 solution.

Detection of sulfate ions:

Add dilute Hno3, and then add Ba(No3)2, there is a white precipitate.

Chloride Detection:

Add dilute HNO3, then add BA(NO3)2, remove (SO4)2-, and then add AGNO3, there is a white precipitate.

Add HCl first to eliminate the possibility of AG2+ in the solution, because BACl2 is added first, and I don't know whether it is BASO4 precipitation or AGCL precipitation.

Add hydrochloric acid first, excessive.

Carbonate and sulfurous acid are removed, and if nitric acid is added directly, the sulfurous acid will be oxidized to sulfuric acid and then barium nitrate will be added.

There is a white precipitate formed, and it is insoluble in nitric acid.

Then there's sulfate.

Analysis of barium nitrate + dilute nitric acid energy test in junior high school: three methods for detecting sulfate ions in junior high school chemistry:

1) Use barium nitrate solution and dilute nitric acid to prove whether the solution to be tested must contain sulfate ions. (K2SO4, Na2SO4, H2SO4).

Specific steps: take a small amount of the solution to be tested in the test tube, first drop a few drops of barium nitrate solution, if a white precipitate is produced, then drop in dilute nitric acid, if the white precipitate does not dissolve, it proves that the solution contains sulfate.

Chemical equation: K2SO4 BA(NO3)2 BASO4 2KNO3.

In fact, the method is inaccurate (the middle school thinks it is right, and for the high school it is the wrong test method. Because if it is in an acidic environment, nitrate ions will oxidize sulfite ions to sulfate ions to form precipitates, and the solution to be tested may contain sulfite ions SO32-).

2) The use of barium chloride solution and dilute nitric acid is a commonly used method in junior high school chemistry, but it can only prove that the solution to be tested may contain sulfate ions.

Specific steps: take a small amount of the solution to be tested in the test tube, first drop a few drops of barium chloride solution, if a white precipitate is produced, then drop in dilute nitric acid, if the white precipitate does not dissolve, it proves that the solution may contain sulfate. Because the white precipitate is insoluble in dilute nitric acid, it may be BaSO4 precipitation, or silver chloride AGCL precipitation.

Chemical equation: K2SO4 BACl2 BASO4 2KC; 2agno3＋bacl2＝2agcl↓＋ba（no3）2。

3) The use of dilute hydrochloric acid and barium chloride solution is a method adopted in high school, which is an improvement of the two methods, which can exclude the interference of other ions and prove whether the solution to be tested must contain sulfate ions.

Specific steps: take a small amount of the solution to be tested in the test tube, first drop a few drops of dilute hydrochloric acid, if there is no change, prove that the solution does not contain silver ions AG+ (will produce white AGCL precipitation), nor carbonate ions CO32- or sulfite SO32- (otherwise bubbles will appear in the solution), and then drop into the barium chloride solution, if white precipitation is produced, it proves that the solution to be tested must contain sulfate ions.

Chemical equation: K2SO4 BACl2 BASO4 2KC; Ion equation: BA2++SO42-=BASO4

Hope it helps.

Anhydrous sodium carbonate reference reagent, bromocresol green-methyl red indicator. For details, see GB T601-2002 Chemical Reagent Preparation of Standard Titration Solution.

Phenolphthalein indicates the endpoint, standard caustic soda solution. Titration.

Sulfate is ionized by sulfuric acid or sulfate. If there is sulfate in a solution and there are only hydrogen ions in it, it is sulfuric acid; If there are cations in it except for hydrogen ions, then the solution is a sulfate solution.

The test of sulfate is generally to add hydrochloric acid to remove carbonate and then add barium ions to form a white precipitate. As for whether there are cations, it should be evaporated solution, and sulfuric acid will not crystallize.

Is this what you're asking?

Sulfate [SO4(2-)] reacts with barium chloride to form an acid-insoluble barium sulfate precipitate, so the presence of sulfate is detected; With barium nitrate, if there is only sulfate in the solution, there is no doubt that the precipitate is barium sulfate, but this is not determined at all, there may be barium sulfite generated by sulfite ions [so 3(2-)] does not precipitate, but due to the introduction of nitrate, its strong oxidation will oxidize sulfite into sulfate, generating precipitation, thus causing the illusion of sulfate in the solution, so it is not.

Sulfate is generally neutral or acidic, first add BaCl2 solution, then add CaCO3 is sulfuric acid, there will be gas, is sulfate, there is no gas.

Bacl2 solution.

Sulfuric acid has precipitation, and then agno3 is added, and there is precipitation.

Add sodium carbonate, there are bubbles that are sulfuric acid, otherwise (including precipitation and other phenomena) are not.

Take two solutions, and then add magenta solution respectively, the sulfurous acid solution that can fade the magenta solution is sulfurous acid solution (sulfurous acid solution contains sulfur dioxide, sulfur dioxide has bleaching properties, can fade the magenta solution), and the sulfuric acid solution can not fade magenta.

With hydrochloric acid, sulfurous acid is the gas.