huanyu  
   
Position :Home>Information>Sodium alginate water insolubles detection method
■ Product list
Sodium alginate

……………………………………………

Textile printing grade sodium alginate
……………………………………………

Food grade sodium alginate

……………………………………………

pharmaceutical grade sodium alginate
……………………………………………

potassium alginate

……………………………………………

alginic acid

……………………………………………

mannitol
……………………………………………
Iodine
……………………………………………

Sodium alginate water insolubles detection method

Release date:2013-03-08


一 . Principle:Sodium alginate aqueous solution through the sand core crucible vacuum filter, the residue washed and dried to constant weight,expressed as a percentage of quality.

二 . Equipment: vacuum pump; sand core Crucible: type P40 or G3, filter plate aperture 30 ~ 50 microns.

三 . Determination of steps: according to take sodium alginate is about 0.5 g (called a quasi to 0.0002 g) in 50 ml beaker, add distilled water to 200 ml, cover the surface of plating, heat to boil, micro keep boiling for 1 hour when heated attention (agitation). Strike is dry constant weight (quality difference between the first and the second is not greater than 0.0002 g for constant weight, cooling operation should strictly keep the unity of the cooling time) the sand core crucible decompression filtration, washing with hot distilled water to fully beaker and sand core crucible, then sand core crucible at 105 ℃ within plus or minus 2 ℃ oven drying to constant weight (quality difference between the first and the second is not greater than 0.0003 g for constant weight).

四 . The results calculated:
Sodium alginate water insolubles press type calculation:

X3 = (m7 - m8) present m6 x 100

X3——water insolubles content in sample, the unit as a percentage (%);

m6——sample quality, the unit is gram (g);

m7——sand core crucible and water quality, the unit is gram (g);

m8——the quality of sand core crucible, the unit is gram (g);

五 . Repeatability:
Each sodium alginate sample takes two parallel samples were determined, with its arithmetic mean value as result.

Two parallel samples results difference (absolute value) must not exceed 0.10, otherwise the measurement again.

Lianyungang huanyu seaweed co., LTD. Mainly produces sodium alginate
All rights reserved © lianyungang huanyu seaweed co., LTD., China's jiangsu ICP 09067152-2