Medicinal grade sodium dihydrogen phosphate cas7558-80-7 use

Medicinal grade sodium dihydrogen phosphate cas7558-80-7 use of sodium dihydrogen phosphate is colorless crystalline or white crystalline powder, odorless, easily soluble in water, its aqueous solution is acidic, almost insoluble in ethanol, heating loss of crystalline water can be decomposed into acidic sodium pyrophosphate (Na3H2P2O7).

It is often used in the fermentation industry to adjust pH, and is often used in food processing with disodium hydrogen phosphate as a food quality improver
.

Such as improving the thermal stability of dairy products, making pH adjusters and binding agents for fish and meat products
.

Sodium Dihydrogen Phosphate, a colorless testrep crystal, slightly hygroscopic
.

Easily soluble in water, at a certain pH value, by the reaction of sodium carbonate with phosphoric acid or by the reaction of disodium bisulfate with a certain proportion of phosphoric acid to prepare easy to agglomerate
in humid air.

Keep sealed
.

pH
regulators.

Used in boiler water treatment, electroplating, tanning, baking powder, fuel additives, detergents, mica thorough integration, acid retarder, etc.
, is also the raw material
for the preparation of sodium hexametaphosphate and polycondensation.

【Check】Acidity Take 2.
0g of this product, add 40ml of water to dissolve, and determine according to law (General 0631), the pH value should be 4.
1 ~ 4.
7
.

The clarity and color of the solution Take 1.
0g of this product, add 10ml of water, shake fully to dissolve, and determine according to law (general rule 0901 first method and general rule 0902 first method), the solution should be clear and colorless
.

Chloride Take 0.
50g of this product, check according to law (General 0801), and compare with the control solution made of 5.
0ml of standard sodium chloride solution, it shall not be more concentrated (0.
01%)
.

Sulfate Take 1.
0g of this product, check according to law (General 0802), and compare with the control solution made of 5.
0ml of standard potassium sulfate solution, it shall not be more concentrated (0.
05%)
.

Loss of drying Take this product, first dry at 60 °C for 2 hours, and then dry at 105 °C to constant weight, the weight loss shall not exceed 2.
0% (General 0831).
Insoluble matter in water Take 10.
0g of this product, heat 100ml of water to dissolve, filter with No.
4 vertical melting crucible dried at 105 °C to constant weight, precipitate with hot water 200ml 10 times washing, dry at 105 °C for 2 hours, the residual residue shall not exceed 20mg (0.
2%)
.

The reducing substance takes 5.
0g of this product, adds a new boiling and cold water to dissolve and dilute to 50ml, the amount takes 5.
0ml, dilutes 5ml of sulfuric acid and 0.
25ml of potassium permanganate titration solution (0.
02mol/L), heated in a water bath for 5 minutes, and the purple-red color of the solution does not disappear
.

Aluminum salt Take 0.
50g of this product, add water to dissolve in an appropriate amount, add acetic acid - ammonium acetate buffer (pH 4.
5) 5ml, then add water to 25ml, add 0.
1% aluminum reagent solution 1ml, shake well, such as red, with the standard aluminum solution (precision weighing aluminum potassium sulfate [AlK(SO4) 2 · 12H2O] 1.
76g, placed in a 1000ml measuring bottle, add water to dissolve and dilute to the scale, shake well; Before use, take 10ml of precision amount, put it in a 100ml measuring bottle, dilute it with water to the scale, shake well, and compare the control solution made of 5.
0ml per 1ml equivalent to 10μg of Al) and not be deeper (0.
01%)
.

Calcium salt Take 0.
50g of this product, add water to dissolve in an appropriate amount, add ammonium oxalate test solution 1ml, place for 1 minute, add dilute acetic acid 2ml, ethanol 5ml, and then add water to 25ml, shake well, if turbid, Compared with the standard calcium solution (precision weighing calcium carbonate 0.
125g dried at 105 °C to constant weight, placed in a 500ml measuring flask, adding 5ml of water to a mixture of 0.
5ml of hydrochloric acid to dissolve, diluted with water to the scale, shake well; before use, precision dosage takes 10ml, placed in a 100ml measuring bottle, diluted with water to the scale, shake well, each 1ml is equivalent to 10μg of Ca) 5.
0ml of the control solution, shall not be more concentrated (0.
01%)
.

Iron salt Take 1.
0g of this product, add water 10ml to dissolve, check according to law (General Rule 0807), and compare with the standard iron solution 1.
0ml of the control solution made by the same method, not deeper (0.
001%)
.

Heavy metals Take 1.
0g of this product, add 20ml of water to dissolve, add acetate buffer (pH 3.
5) 2ml and water to make an appropriate amount of 25ml, according to the law to check (General 0821 first law), containing heavy metals shall not exceed 10
parts per million.

Arsenic salt Take 1.
0g of this product, add 23ml of water to dissolve, add 5ml of hydrochloric acid, check according to law (General 0822 First Law), should comply with the provisions (0.
0002%)
.