Reagent preparation methods are commonly used.

1. Ethanol potassium hydroxide test
desirable to use ethanol to make potassium hydroxide (0.5mol/L).
2. Ethanol ammonia test liquid
take waterless ethanol, thick ammonia test liquid so that 100 ml containing NH3 9 to 11g, that is.
liquid should be stored in a rubber plug bottle.
3. Ethanol-based mercury bromide test liquid
take 2.5g of mercury bromide, add 50 ml of ethanol, microthermal dissolve, that is.
liquid should be placed in a glass plug bottle and stored in the dark.
4. DDI-Methane Silver Test Liquid
Take 0.25g of biethyl disulfur-coded amino acid silver, chloroform moderate amount and triethylamine 1.8ml, chloroform to 100ml, stir to dissolve, place overnight, filtered with skimmed cotton, that is.
liquid should be placed in a brown glass bottle, stuffed, stored in a cool place.
5.dnitrobenzene test liquid
2g of nitrobenzene, plus ethanol to dissolve into 100 ml, that is, obtained.
6.dnitrate benzoic acid test liquid
take 3,5-nitrobenzene acid 1g, plus ethanol to dissolve into 100 ml, that is.
nitrobenzene ethanol test liquid take 2,4-dinitrobenzene 1g, add 1000ml ethanol to dissolve, and then slowly add 10ml hydrochloric acid, shake well, that is.
7. Dinitrobenzene test liquid
take 2,4-dinitrobenzene 1.5g, sulfuric acid solution (1→2) 20ml, dissolved, water into 100ml, filtered, that is.
8. Trinitrophenol test fluid (bitter acid? The solution is a saturated water solution of trinitrophenol.
9. Iron triclose test liquid
take 9g of iron triclosate and add water to dissolve into 100 ml, i.e.
10.Aluminium triclose test liquid
take 1g of aluminum triclosate, plus ethanol to dissolve into 100 ml, that is.
11.Triclosine test liquid
this solution is a chloroform solution saturated with palladium tyclones.
12. Hydrated chloral test liquid
take 50g of hydrated chloralde, add 15 ml of water and 10 ml of glyceroid to dissolve, that is.
13.Glycero acetate test liquid
take glycerocury, 50% acetic acid and water, mixed, that is.
14. Formaldehyde
can be used as a "formaldehyde solution".
15.tybenzene boron sodium test liquid
take 0.1g of sodium tetrene boron, add water to dissolve into 100 ml, that is.
16. After the solution of a cold mixture of 65 ml of nitrogen-free sulphuric acid and 35 ml of water, the test fluid of metformin
was added 0.05 ml, shaken well, and was obtained.
7 days after the preparation of this liquid is not applicable.
17. Potassium athyrocycide test
take 1g of potassium cyanide, add water 10 ml to dissolve, that is.
liquid should be used in the new system.
18.Sodium nitrocyanide test liquid take 1g of sodium nitro-iron cyanide, add water to dissolve into 20 ml, that is.
liquid should be used in the new system.
19.Sodium nitrite ethanol test liquid
take 5g of sodium nitrite, plus 60% ethanol to dissolve into 1000ml, that is.
20. Sodium nitrite test liquid
take 10g of cobalt nitrite, add water to dissolve into 50 ml, filtered, that is.
.