Detection methods and references of aluminium hydroxide on knees!! Thanks!!

GB T Aluminium Hydroxide Chemical Analysis Method Gravimetric determination of moisture.

GBT Aluminum hydroxide chemical analysis method Gravimetric determination of loss on ignition.

GB T Aluminum Hydroxide Chemical Analysis Method Molybdenum blue light method for determination of silica content.

Gb t Aluminum Hydroxide Chemical Analysis Methods O-diazaphenanthrene photometric determination of ferric oxide content.

GB T Aluminum Hydroxide Chemical Analysis Methods Determination of Sodium Oxide Content.

The series of standards for chemical analysis of aluminum hydroxide has been abolished, and the national standard has been converted into the industry standard for non-ferrous metals. The converted standard numbers are: YS T and YS T respectively.

YS T will be repealed on 2008-05-01 and will be replaced by YS T.

In addition, there are:

Pharmacopoeia of the People's Republic of China, 2005 Edition, Part II, Aluminum Hydroxide (page 405), Aluminum Hydroxide Sheet (page 405), Aluminum Hydroxide Gel (page 406).

Veterinary Pharmacopoeia of the People's Republic of China, 2005 Edition, Part I, Aluminum Hydroxide (p. 144).

Ministry of Health Standard WS1-74(B)89 Aluminum Hydroxide Sheets.

Aluminum Corporation of China **** Enterprise Standard Q CHALCO A014-2004 High White Filler Aluminum Hydroxide.

Drafted by Chinalco Shandong Branch.

Instructions for the preparation of the industry standard "Determination of the Contents of Trace Elements Arsenic, Cadmium, Chromium, Mercury, Lead and Vanadium in High White Filler Aluminum Hydroxide and Pseudo-Sodium Cumsite by ICP AES Spectroscopy".

Aluminum hydroxide is the ingredient.

This is a residual titration.

The reaction of EDTA with both zinc and aluminum ions is 1:1;

The content in grams = c nominal molar concentration m molar amount of aluminum hydroxide (25 EDTA correction factor (C EDTA actual c nominal) - v zinc test solution volume Zinc test solution correction factor (C zinc test solution actual grip change c nominal)) (number of milliliters) 10 (for the dilution section of the stove judgment multiple) ......The unit is milligrams.

The content in grams = c nominal molar concentration m molar mass of aluminum hydroxide (25 edta correction factor (c edta actual ignition c nominal) - v zinc test solution volume zinc test solution correction factor) (milliliter number) 10 (dilution times zen wang number) ......The unit is milligrams.

1. Soluble aluminum salt and ammonia water are reacted to prepare Al(OH).

alcl₃+3nh₃·h₂o=al(oh)₃↓3nh₄cl

al₂(so₄）₃6nh₃·h₂o=2 al(oh)₃↓3（nh₄）2so₄

Because strong alkalis (such as NaOH) are easy to react with Al(OH), the laboratory does not use strong alkalis to prepare Al(OH), but uses ammonia.

2. Sodium tetrahydroxyaluminate reacts with excess carbon dioxide.

na[al(oh) ]co (over) = nahco +al(oh).

Reaction of aluminum salt and ammonia: Al3++6NH3H2O== AL(OH)3 +3NH4+

This is the best method, other methods are difficult to control the dosage, resulting in Al(OH)3 reaction, such as: 1. React aluminum chips with concentrated NaOH solution first: 2Al+2OH-+2H2O==2alo2-+3H2

2. Add an appropriate amount of dilute sulfuric acid: alo2- +h+ +h2o== al(oh)3

It can be seen that if the amount of dilute sulfuric acid is not well controlled, the generated aluminum hydroxide is very easy to form aluminum sulfate and dissolve again.

al(oh)3↓+3nh4+

al(oh)3↓+3na+

Because Al(OH)3 is soluble in a strongly reduced solution, for example, the reaction of Al(OH)3 and NaOH will produce sodium metaaluminate (soluble in water), Al(OH)3+NaOH====Naalo2+2H2O, which will immediately dissolve the newly prepared Al(OH)3. Whereas, ammonia is a weakly alkaline solution, and aluminum hydroxide does not react with ammonia.

Therefore, ammonia is commonly used to prepare aluminum hydroxide.

Aluminum hydroxide laboratory method.

Chemical equation: ALCl3+

Ionic equation: al3++

Aluminium chloride reacts with ammonia.

Sodium metaaluminate reacts with carbon dioxide (preferably in excess, but in small amounts).

Then turn it on, and let you test which method? It's up to you to test whichever method you want.

There are three ways to prepare aluminum hydroxide from aluminum.

The first: Al to Al ions to Aluminum Hydroxide (the least cost-effective) The second type: Al to ALO2- to Xiaoju Aluminum Hydroxide (medium) The third type: Al directly generates Al Separation Bush and ALO2- and then produces Aluminum Hydroxide (the most cost-effective).

The ionic equation for the third is Al3+ +3alo2- +6H2O 4Al(OH)3

Dissolve the compound aluminum hydroxide sheets, add excess and quantitative EDTA standard solution, boil for a few minutes at pH = to make the +3 valent aluminum and EDTA complexed completely, followed by pH 5--6, with xylenol orange as an indicator, and reverse titrate the excess EDTA with +2 zinc solution to obtain the aluminum content. The above scheme is used to determine the content of aluminum in aluminum alloys, and it is estimated that the aluminum hydroxide is similar.

Take a sheet of aluminum hydroxide, weigh m grams, mash and grind.

Add sufficient sodium hydroxide to dissolve and filter;

Take the filtrate, add sufficient hydrochloric acid, until the generated precipitate dissolves again, and filter;

Take the filtrate, add enough sodium bicarbonate, obtain precipitate, and filter.

Wash the precipitation, dry, weigh n grams.

Reaction Equation:

al(oh)3 + naoh = naalo2 +2h2o②naalo2 + hcl + h2o = al(oh)3↓ +nacl，al(oh)3 + 3hcl = alcl3 + 3h2o

alcl3 + 3nahco3 + = al(oh)3↓ +3nacl + 3co2↑

The first step of sodium hydroxide dissolution is mainly to remove other alkaline substances such as mg(OH)2, and this step can be omitted if it can be determined that there are no other alkaline substances.

Calculation: Content = n m·100%.

It's easy to do it with atomic absorption.

This is a leftover titration method.

The reaction of EDTA with both zinc and aluminum ions is 1:1;

The amount in grams = c nominal molar concentration.

m Aluminum hydroxide.

Molar mass (25 EDTA correction factor delay (C EDTA actual C nominal)-v zinc test solution volume Zinc test solution correction factor (C zinc test solution actual c nominal)) (ml) 10 (dilution elimination age multiple) ......The unit is milligrams.

Reaction of aluminum salt and ammonia: Al3++6NH3H2O== AL(OH)3 +3NH4+

This is the best method, other ZD methods are difficult to control the dosage, resulting in Al(OH)3 reaction, such as: 1. React the aluminum chips with the concentrated NaOH solution first: the positive eggplant leaks back 2AL+2OH-+2H2O==2ALO2-+3H2

2. Add an appropriate amount of dilute sulfuric acid A: alo2-

h+h2o==

al（oh）3

It can be seen that if the amount of dilute sulfuric acid is not well controlled, the aluminum hydroxide formed by raw and rotten is very easy to form aluminum sulfate and then absorb and dissolve.