Product inspection standard of two sodium hydrogen phosphate manufacturer


The test standard of two sodium phosphate is important to compare,Two sodium hydrogen phosphate manufacturerQingzhou Chemical plant to introduce to you the test standards and methods of two sodium phosphate, for your reference.
Two sodium hydrogen phosphate acidity
Take phosphoric acid two sodium hydrogen 20g, add water 40ml dissolved, according to the provisions of the determination, ph value should be 4.1~4.5.
Chloride
Two sodium hydrogen phosphate 0.50g, measured according to the regulations, compared with the standard sodium chloride solution 5.0ml made of control liquid comparison, should not be thicker (0.01l).
Sulfate
Take phosphoric acid two sodium hydrogen 1. Og, measured according to regulations, should not be thicker than the control solution made of 5.0m, a standard potassium sulfate solution.
Dry weightlessness
Take two sodium phosphate, first dry at 60 ℃ for 2 hours, then dry to constant weight in 105 ℃, and lose weight should be 10.0 to 15.0.
Aluminium salt
Take phosphoric acid two sodium hydrogen 0.50g, add water to dissolve in moderation, add acetic acid ammonium acetate buffer (pH4.5) 5ml, then add water to 25ml, add 0.1 aluminum reagent solution 1ml, shake evenly, such as red, and standard aluminum solution 5.0ml made of control liquid comparison, not deeper.
Calcium salt
Take phosphoric acid two sodium hydrogen 0.50g, add water to dissolve in moderation, add ammonium oxalate test Liquid 1ml, place 1 minutes later, add dilute acetic acid 2m, ethanol 5ml, and then add water to 25ml, shake evenly, such as cloudy, With the standard calcium solution 0.125g, set 500ml bottles, add water 5ml and hydrochloric acid 0.5ml mixture to dissolve, dilute with water to scale, shake evenly, before use, take 10ml, set 100ml bottles, add water dilution to scale, shake evenly, each 1ml equivalent to 10ug made of CA control liquid comparison, not thicker (0.01).
Heavy Metal
Take phosphoric acid two sodium hydrogen 1. Og, add water 20ml dissolved, add acetate buffer (pH3.5) 2ml and water in moderation to make 25ml, check, containing heavy metal must not be over ten out of 10,000.
Arsenic salt
Take phosphoric acid two sodium hydrogen 0.4g, add water 23ml dissolved, add hydrochloric acid 5ml, according to the requirements of the inspection should comply with the regulations (0.0005).
Qingzhou chemical plant as two sodium phosphate production manufacturer of two sodium phosphate is strictly in accordance with the standards, welcome to choose us.


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