腐植酸钾中钾含量测定方法(英文版)
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1.Technical requirement
Appearance:This product is black sheets, moisture absorption,please test it in dry sample.
2.Testing procedures
Get 1g of the sample into 250ml beaker,then add 70ml 1:12 hydrochloric acid,Dissolved in water,Oxidation for 30 minutes,take out cool filter,place it into 100ml bottle.
Get 25ml of the filtrate with pipette,and put it into 250ml beaker, add one drop Phenolphthalein indicator(0.1%),and drop 20% liquor Sodium hydroxide until it turn to yellow,add EDTA 5ml(20%),add distilled water 10ml, stir it while add 7ml 4% liquor sodium tetraphenylboron(use the liquor sodium tetraphenylboron after filtrate),place for 20 minutes, Then filtrate it with weighing bottle (The weighing bottle should be pre-dried in drying baker) and test paper, washing it for 6 times with 0.1% sodium tetraphenylboron,and washing 2 times with distilled water. Put the weighing bottle(the test paper in the bottle) in drying baker(120°C) for 90 minutes.
In same condition, do the blank assay with water(DO Not PUT filtrate)
K+ Content=(G1-G2)*0.1091/G*0.25*100%
G1:The weight of Potassium Tetraphenylborate precipitation,gram
G2:The weight of blank assay precipitation ,gram
G:The weight of after arefaction sample ,gram
Analysis moisture by dry basis
0.1091:The coefficient of Sodium tetraphenylboron weight convert as potassium weight