Testing item

 XW-591

 XW-611

Testing standard

Testing standard

appearance

white to yellowish-white powder with no foreign odor

white to yellowish-white powder with no foreign odor

lead(Pb)/(mg/kg)

≤2.48 

≤2.36 

arsenic(As)/(mg/kg)

≤2

≤2

Internal control indicators

identification

positive reaction   

positive reaction   

loss on drying,w/%

≤8.0

≤8.0

residue on ignition,w/%

≤5.0 

≤5.0 

viscosity, mpa.s

50-250(1.2% aqueous solution)

100-350(2.6% aqueous solution)

PH

6.0-8.0

6.0-8.0

heavy metal,mg/kg

≤10

≤10

 bacteria, cfu/g 

≤1000

≤1000

 mould, cfu/g

≤100

≤100

pathogenic bacterium

not detectable

not detectable