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Item

Standard

Test results

Appearance

White crystalline powder

White crystalline powder

Content%

99.0~101.0%

99.7

Loss on Drying(105℃,2h)%

≦1

0.17

Organic Impurities ug/g

≦20

<20

Fluoride mg/kg

≦3

<1

Potassium %

17.0~21

18.94

Heavy Metals mg/kg

≦5

<5

Lead mg/kg

≦1

<1

Selenium mg/kg

≦10

<1

Sulphate %

≦0.1

<0.03

PH(1 in 100 solution)

6.5~7.5

6.8

Arsenic mg/kg

≦3

<1

Mercury mg/kg

≦10

None

Solubility in Water

Freely soluble

Freely soluble

Solubility in Ethanol

Slightly soluble

Slightly soluble

Ultraviolet Abserption

227±2nm

227±2nm

Precipitation test

Yellow Precipitate

Yellow Precipitate

Total Plate Count cfu/g

≦200

<10

Coliforms-MPN MPN/g

≦10

None

yeast and Moulds cfu/g

≦100

<10

E.Coli

Negative

None

Salmonella

Negative

None